The Red List of
Oaks
Sara Oldfield and Antonia Eastwood
FAUNA & FLORA INTERNATIONAL (FFI), founded in 1903 and the
world’s oldest international conservation organization, acts to conserve
threatened species and ecosystems worldwide, choosing solutions that
are sustainable, are based on sound science and take account of
human needs.
Published by Fauna & Flora International,
Cambridge, UK.
© 2007 Fauna & Flora International
ISBN: 9781 903703 25 0
BOTANIC GARDENS CONSERVATION INTERNATIONAL (BGCI)
is a membership organization linking botanic gardens in over 100
countries in a shared commitment to biodiversity conservation,
sustainable use and environmental education. BGCI aims to mobilize
botanic gardens and work with partners to secure plant diversity for the
well-being of people and the planet. BGCI provides the Secretariat for
the IUCN/SSC Global Tree Specialist Group.
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the world. The aim of the Campaign is to save the world’s most
threatened trees and the habitats in which they grow through the
provision of information, delivery of conservation action and support for
sustainable use.
AUTHORS
Sara Oldfield is Secretary General of Botanic Gardens
Conservation International (BGCI) and Chair of the
IUCN/SSC Global Tree Specialist Group.
Antonia Eastwood was formerly Tree Red List Officer
at Fauna & Flora International and is now Plant
Ecologist at the Macaulay Institute, Aberdeen,
Scotland.
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necessarily reflect the opinion of either the editors or
Fauna & Flora International.
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of the Species Survival Commission’s volunteer network of over 7000
volunteers working to stop the loss of plants, animals and their habitats.
SSC is the largest of the six Commissions of IUCN-The World
Conservation Union. It serves as the main source of advice to the Union
and its members on the technical aspects of species conservation. The
aims of the IUCN/SSC Global Tree Specialist Group are to promote and
implement global red listing for trees and act in an advisory capacity to
the Global Trees Campaign.
The authors and Fauna & Flora International take no
responsibility for any misrepresentation of material from
translation of this document into any other language.
COVER PHOTOS
Front cover: Quercus rysophylla by Juan Pablo
Moreiras/FFI. Back cover: Girl with acorn of Quercus
insignis by Allen Coombes.
COVER DESIGN
John Morgan, Seascape.
Printed on 80% recycled, 20% FSC certified paper.
The Red List of
Oaks
Sara Oldfield and
Antonia Eastwood
The Red List of Oaks
CONTENTS
Acknowledgements
3
Acronyms
3
Foreword
4
Introduction
5
References
8
LIST OF GLOBALLY THREATENED OAKS
9
List of Oaks evaluated as Least Concern
21
References
27
ANNEX 1
IUCN Red List Categories and Criteria
2
29
The Red List of Oaks
ACKNOWLEDGEMENTS
M
any experts around the world
have contributed information and
undertaken assessments for this
global evaluation. Their input is gratefully
acknowledged. Simon Mickleburgh, FFI,
prepared the lists of endemic species by
country and species with widespread
distributions considered to be Least
Concern, undertook the preliminary
assessments of the US species using the
IUCN Red List Categories and Criteria
and undertook much of the initial
correspondence with experts. Tiffany
Aylett made most of the arrangements for
the Regional Tree Red Listing Workshop
in the Caucusus, working with the local
NGO NACRES. Dr Georgina Magin,
Global Trees Campaign Coordinator, has
managed various aspects of the project
including final editing and production of
the report. Fiona Wild helped to edit the
document.
Allen Coombes of Sir Harold Hillier
Gardens and Arboretum provided expert
input throughout the project. He organized
the workshop in China and, jointly with
Maricela Rodriguez-Acosta, organized the
workshop in Mexico. Other participants at
the Mexican workshop were Susanna
Valencia-Avalos, and Fernando ZavalaChavez. Participants at the China
workshop were Zhekun Zhou and D. Min.
Participants at the Caucasus workshop
were Dr Otar Abdaladze, Institute of
Botany, Georgia; Dr Maia Akhalkatsi,
Institute of Botany, Georgia; Ketevan
Batsatsashvila, Institute of Botany,
Georgia; Dr Marina Eristavi, Institute of
Botany, Georgia; Dr George Fayvush,
Institute of Botany, Armenia; Giorgi Gigauri,
WWF Caucasus, Georgia; Dr Adil Güner;
Dr Mirian Gvritishvili, Tbilisi Botanic
Garden, Georgia; Professor Vahid Hajiyev,
Institute of Botany, Azerbaijan; Professor
Svetlana Litvinskaia, Suban State
University, Russia; Dr Zurab Manvelidze,
Batumi Botanical Garden, Georgia; Dr
George Nakhutsrishvilli, Director of the
Tbilisi Institute of Botany, Georgia; Dr
Galina Pronkina; IUCN, Russia; Professor
Dr Peter A. Schmidt, University of
Dresden, Germany; Dr Shamil Shetekauri,
Institute of Botany, Georgia; Dr Shalva
Sikharulida, Bakuriani Alpine Botanical
Garden, Georgia; Dr Tatyana Shulkina,
Missouri Botanical Garden and Dr Kamilla
Tamanyan, Institute of Botany, Armenia.
Participants at the Guatemala workshop
held in September 2005 were, from
CONAP: Omar Molina, Hiram Ordóñez,
Julio Madrid, Edy Girón, Julio Tzirin, Otoniel
Chacón, Mygdalia García, Lis Lima, Héctor
Gutiérrez and Julio Cruz Corzo; from
CECON: Miguel Flores, Ana María Ortiz,
Rebeca Orellana, Marie Storek and Julio
Morales; from other institutions: Conrado
Valdés Markwordt (USAC), Martín Sánchez
(Central University of the South West /
USAC), Brenda Chávez (Museum Jorge
Ibarra of Natural History), Herbert Ortega
(National School of Agricultural Training,
ENCA), Mario Díaz (INAB).
Other people who have contributed
valuable advice and/or information are
Dr Jeffrey Bacon, Mexico; Bruce
Bartholemew, California Academy of
Sciences; Rosalina Berazaín, Cuba; Y.
Cheng, Taiwan; Dr Lillian Chua, Forest
Research Institute Malaysia; Dr Giuseppe
Garfì, Sicily; M. González-Espinosa,
Mexico; Dr Felix Llamas, University of
Leon, Spain; Martín E. Mitre, Panama;
Neptali Ramírez-Marcia, Mexico; Dr Nghia,
Vietnam; G. Rusea, Malaysia; and
Dr Salma Talhouk, Lebanon.
LIST OF ACRONYMS
BGCI
CBD
CECON
C&I
CONAP
FFI
GSPC
GTSG
IPA
INAB
IUCN
Botanic Gardens Conservation International
Convention on Biological Diversity
Nature Conservation Centre, Guatemala
Criteria and Indicators
National Council for Protected Areas, Guatemala
Fauna & Flora International
Global Strategy for Plant Conservation
Global Tree Specialist Group
Important Plant Area
National Forestry Institute, Guatemala
International Union for the Conservation of
Nature and Natural Resources
NGO
SSC
UNEP-WCMC
UNAM
USAC
Non-government Organization
Species Survival Commission
United Nations Environment ProgrammeWorld Conservation Monitoring Centre
Universidad Nacional Autonóma de México
University of San Carlos, Guatemala
3
The Red List of Oaks
FOREWORD
T
rees are important to the well-being
of people in every country of
the world, providing essential
ecological, economic and cultural
services. Oak trees are valued for their
uses as a source of timber, cork, dyes
and animal fodder. They are of symbolic
value in many cultures and widely planted
ornamentally. Ecologically, oaks are
keystone species in a wide range of
habitats from Mediterranean semi-desert
to subtropical rainforest. Oaks are under
threat in the wild from general forest
loss and over-exploitation of particular
species. This report presents a review of
the conservation status in the wild of oaks
worldwide, undertaken by the IUCN/SSC
Global Tree Specialist Group.
Since its establishment in 2003, the
primary role of the IUCN/SSC Global Tree
Specialist Group has been to assess the
global conservation status of tree species
in selected geographical areas and
taxonomic groups. The Red List of Oaks
is the fourth publication in the series.
The collection of information on tree
species of conservation concern is vital
for planning conservation action. The
second role of the IUCN/SSC Global Tree
Specialist Group is to act as an advisory
body for the Global Trees Campaign,
which aims to save the world’s most
threatened tree species and the habitats
where they grow. The Global Trees
Campaign provides an important
practical mechanism for implementation
of the Global Strategy for Plant
Conservation of the Convention on
Biological Diversity. Global tree red listing
contributes directly to Target 2 of the
Strategy, which calls for a provisional list
of threatened plant species by 2010. In
many ways Target 2 underpins the other
ambitious targets that relate to in situ and
ex situ conservation and sustainable use
4
and trade in plants. Projects of the Global
Trees Campaign carried out in
partnership with organizations and
individuals around the world help to
deliver these various targets. The projects
contribute to halting the loss of forest
biodiversity and the provision of support
to rural livelihoods.
The Global Tree Specialist Group is
committed to undertaking a global
assessment of the conservation status of
tree species. Results of the global
assessment will be published as
components of the work are completed.
This will ensure that regular indicators of
progress are produced, updated tree
conservation data are made widely
available and that tree conservation
initiatives around the world can be
supported. This fourth publication
highlights the urgent need to take action
for globally threatened oak species.
Unfortunately, it also highlights major
information gaps in the conservation
status of species in the wild. The report
makes a strong plea for further research
and action to save the globally threatened
oak species and the habitats where they
occur.
Sara Oldfield
Chair of the IUCN/SSC Global Tree
Specialist Group
The Red List of Oaks
INTRODUCTION
Oaks (Quercus spp.) are of global
ecological and economic importance and
have great symbolic value in many
countries. They have provided a major
source of timber and coppice wood for
centuries and continue to provide a
significant proportion of temperate
hardwood production. Other useful
products derived from oaks include
fuelwood, charcoal, medicinal products,
dyes, cork and bark used in tanning.
Acorns have provided food in times of
famine and continue to provide animal
fodder. Many species of oak are grown
ornamentally around the world.
The genus Quercus contains over 500
species, mainly growing in the northern
hemisphere. They occur in habitats ranging
from arid Mediterranean areas to
subtropical rainforest, with species
predominantly found in deciduous or
evergreen forest with summer rainfall. The
greatest diversity of species is found in
Mexico, with around 160 species, 109 of
which are endemic to the country. Oaks are
a dominant component of species-rich
montane forests and lowland dry forests in
Mexico and are amongst the most
important trees for supporting rural
livelihoods, primarily because of their
widespread use as fuelwood and timber.
Of the Mexican oak species, 33 species
share their range with the USA whereas 20
extend into countries further south
(Valencia-A., 2004).
A second centre of diversity for oaks is
China, also with over 100 taxa. This
includes species within the genus
Cyclobalanopsis, which is treated as a
separate genus in the Flora of China (Flora
of China Editorial Committee, 1999). Oaks
are important components of the
broadleaved evergreen forest of China.
Zhou Yue et al (2001) reported that the
traction of lateral roots of Cyclobalanopsis
plants plays an important role in effecting
soil stability and slope protection in shelter
forests, especially in mountainous areas.
This has significant ecological importance
in the development and succession of tree
communities. As in other parts of the
world, Chinese oaks are harvested for
timber, charcoal, the production of dyes
and medicinal products.
Around the world many species of oak are
threatened with extinction, mainly because
of land use changes, livestock grazing and
unsustainable harvesting. For the past 200
years, large areas of oak forest in the
highlands of Mexico, Central America and
the northern Andes have been cleared for
coffee plantations and cattle ranching.
Continuing threats to these forests include
exploitation for timber, fuelwood and
charcoal (Kappelle, 2006b).
In the USA, entire oak ecosystems have
declined due to a combination of factors
still imperfectly known. Fire suppression,
increased consumption of acorns by
growing mammal populations, herbivory of
seedlings, introduced pests and climate
change are all thought to be contributory
factors. (Lorimer, 2003). In some areas of
the southern USA, forest management
practices favour replacement of hardwood
forests with conifer plantations. Invasive
species including insects and fungal
pathogens such as Phytophthora
ramorum, which causes Sudden Oak
Death, are threats to oaks in various
countries. Oaks in western USA have been
severely affected by this pathogen and
outbreaks of oak death caused by
Phytophthora have recently been reported
in Mexico.
Various studies have recently been
published or are underway on the impact
of climate change on the distribution of oak
species. Based on initial bioclimatic
modelling, some of the species expand
their ranges with increase in temperature,
but, in more drastic scenarios, most of the
species contract their ranges. In the USA,
for example, some widespread oaks are
expected to increase their ranges whereas
narrow endemics in California are predicted
to become increasingly threatened with
extinction. In Mexico preliminary work
linking the distribution of oak species with
in situ conservation of rare plant hotspots
and climate change has been undertaken
by Universidad Nacional Autonóma de
México (UNAM) (Tellez-Valdes, 2006).
INFORMATION COLLECTION FOR
CONSERVATION ASSESSMENT
The collection of information on the
conservation status of oaks and evaluation
using the IUCN Red List Categories and
Criteria has been a collaborative endeavour
involving botanists worldwide. The experts
who have provided information for this
report are listed on p.3.
The starting point for the global evaluation
was the World Checklist and Bibliography
of Fagales (Govaerts & Frodin, 1998). This
provides a readily available global list of oak
taxa. More recent taxonomic literature has
been consulted where available, but the
taxonomy of oaks remains controversial
and complex in many countries. Using the
World Checklist, single-country endemics
and oak species with restricted
geographical ranges were identified for
further consideration of rarity and threat
status. Some endemic taxa included in the
World Checklist have subsequently been
excluded following correspondence with
experts. Quercus sicula Borzí, for example,
previously considered endemic to Sicily, is
only known through a unique specimen
cultivated at the Botanical Garden of
Palermo. Although in the Flora d’Italia
(Pignatti, 1982) it is reported in the wild in
the region between the towns of Mirto and
Cutò in the Nebrodi Mountains (Province of
Messina), it has not been recently collected
and no more detailed information about its
5
The Red List of Oaks
distribution is available. The true taxonomic
status of the cultivated specimen is
controversial (Garfi, 2006).
The conservation status of additional
species published since 1998 (when the
World Checklist was published) have been
considered based on recent literature.
Information on the 58 taxa already
assessed as globally threatened and
recorded in the IUCN Red List was
incorporated into the list of taxa for further
consideration. These 58 taxa, mostly trees
occurring in Mexico and the USA, had
been assessed using the IUCN Red List
Categories and Criteria version 2.3 and
new assessments were necessary using
version 3.1 of the Categories and Criteria.
A list of widespread oak species assumed
to be Least Concern was also compiled
and placed on the Global Trees Campaign
website, with comments invited to verify
the status of these species.
For the species identified as single-country
endemics or of restricted geographical
range, experts were identified to undertake
conservation assessments. According to
the World Checklist and Bibliography of
Fagales, a total of 345 Quercus species are
endemic to a single country. Thirty-two
countries worldwide have endemic oaks.
Status assessments were made using an
edited version of the standard IUCN Red
List Assessment Sheet. A series of small
workshops was also held to facilitate the
evaluation process. The workshops took
place in Puebla, Mexico in May 2004
(Coombes et al, 2004). and in China in
October 2004.
Oaks occurring in Guatemala were
evaluated as part of a broader tree Red
Listing exercise for the country, which
involved extensive consultation within
Guatemala and a national workshop held
in September 2005 (Vivero et al. 2006).
Oaks of the Caucasus were also evaluated
6
during a three-day regional workshop to
assess threats to tree species in the
Caucasus in September 2005, held in
Tbilisi, Georgia (Global Tree Specialist
Group, 2005). In 2005, NatureServe
reviewed the conservation status of oaks
of the USA as a contribution to the global
evaluation.
RESULTS OF THE EVALUATION
This report presents the results of a global
evaluation of the conservation status of oak
species. Initially, an attempt was made to
apply the IUCN Red List Categories and
Criteria version 3.1 to all taxa within the
genus, with the general exception of
naturally occurring hybrids. However, for
over half the species it proved impossible
to collect sufficient information and these
species remain Not Evaluated. In total there
are around 500 taxa in the genus and
IUCN Red List Categories and Criteria have
been applied to 208 of these. A significant
number are recorded as Data Deficient,
where experts have considered the
available information and have not been
able to evaluate the degree of threat. These
species are assumed to be threatened on
the basis of restricted distribution, but field
work is required to verify the status. In
some cases there is taxonomic uncertainty
about the species concerned.
SUMMARY OF RESULTS
Conservation
Status
Extinct
Critically Endangered
Endangered
Vulnerable
Near Threatened
Data Deficient
Not Evaluated
Least Concern
Number of
oak taxa
0
13
16
27
22
33
c.300
97
CURRENT CONSERVATION
MEASURES FOR THREATENED OAKS
Information on the distribution and
abundance of threatened plant species is
of primary importance in the planning and
implementation of biodiversity conservation
activities. The need for attention to be
focused on rare and threatened species is
recognized within the objectives and
implementing mechanisms of the main
international biodiversity conventions,
notably the Convention on Biological
Diversity (CBD). Target 2 of the Global
Strategy for Plant Conservation (GSPC)
calls for a provisional list of threatened plant
species by 2010. Target 2 underpins the
other ambitious targets of the GSPC,
which relate to in situ and ex situ
conservation and sustainable use and
trade in plants.
In situ conservation of oak species can be
undertaken by the inclusion of the habitat
of threatened species within protected
areas or by the sustainable management
of the forest habitats of oak species of
conservation concern. Examples of
globally threatened oak species that occur
within protected areas include Q.
benthamii, which occurs in the El Triunfo
Biosphere Reserve in Mexico, and Quercus
hinckleyi, most of the known populations
of which occur in Big Bend Ranch State
Park, under the management of Texas
Parks and Wildlife, USA.
In situ protection measures were proposed
for the Endangered species, Quercus
hintonii, based on a project supported by
the Global Trees Campaign. These
included working with private owners of
land where the species occurs to decrease
deforestation on that land, training relevant
authorities in propagation of the species
and reintroduction techniques and
improving public awareness of the value
and rarity of Q. hintonii (Rodriguez-Acosta
& Coombes, 2000).
The Red List of Oaks
Sustainable
management
of
the
neotropical montane oak forests is
discussed in Kappelle (2006a). Criteria and
Indicators
(C&I)
for
sustainable
management of this particular forest type
are proposed by Herrera & Chaverri (2006)
within that publication. As improved
information becomes available, the specific
needs of threatened oak species can be
taken into account in the development and
application of C&I.
Oaks are relatively well represented in ex
situ collections within botanic gardens and
arboreta. Such collections are valuable as
an insurance policy at a time of rapid global
change. Ex situ collections also provide an
opportunity for research into propagation
and recovery techniques. For example,
Q. hintonii is grown in three botanic
gardens in Mexico as well in overseas
collections. Although this species shows a
good germination rate, its adaptation
to cultivated conditions has been of
limited success so more work on
cultivation conditions is being done at the
Botanic Garden in the University of Puebla
(Coombes & Rodriguez-Coombes, 2007).
BGCI’s PlantSearch Database records
around 240 oak taxa as occurring in living
collections. This includes ten species that
are Endangered or Critically Endangered.
More work is needed to identify other living
collections, particularly as oak seeds are
not generally able to be stored under
conventional seed bank conditions.
Cryopreservation
techniques
using
embryogenic cultures and embryonic axes
have been developed for a few species
(Pritchard, 2007).
Some efforts are being made to
reintroduce threatened oak species in their
natural habitats. Seedlings of Q. benthamii
have been massively produced in local
nurseries and allow its re-introduction into
impoverished stands in highland areas of
Chiapas, Mexico (Ramírez-Marcial et al.
2005). A nursery has been successfully
established in Las Cañadas Reserve in
Huatusco for the propagation and replanting of Q. insignis (Coombes &
Rodriguez-Coombes, 2007).
PRIORITY NEEDS FOR FURTHER
ACTION
The information compiled in this report
should be used to guide conservation
policy both at an ecosystem and species
level. Although incomplete, it provides a
useful baseline for planning conservation
action. At the same time, the conservation
status of oak species is poorly known in
various parts of the world and further
information collection is needed. In Mexico,
the country with the highest diversity of oak
taxa, 17 are still considered Data Deficient
and others have not yet been evaluated.
The need to review further the conservation
status of oaks in Mexico was discussed at
a workshop on the Conservation status of
Mexican cloud forest tree species
organised by the Global Tree Specialist
Group in May 2007 (Newton, 2007). Other
countries where the evaluation of the
conservation status of oak species, based
as far as possible on field survey, remains a
priority include India, Laos, Lebanon and
Viet Nam.
Urgent attention is required for the 12
species considered to be Critically
Endangered. Three of these species are
known to be in cultivation in botanic
gardens, providing a basis for research and
potential re-introduction into the wild. A
more thorough survey of ex situ collections
of globally threatened oak species is a
priority action that is being undertaken by
BGCI. The information on existing holdings
and propagation techniques will be used to
guide both species and habitat restoration.
Oaks will only be effectively conserved if
their natural habitats are secure. Specific
needs of threatened oak species should be
taken into account in the development and
application of C&I for forest management,
for example in Mexico, Central America
and China. Information on the conservation
status of oaks should also be taken into
account in the regional planning of forest
conservation action.
Looking ahead, more information is
needed on the impact of climate change
on oak species. Given the, albeit
preliminary, results of this global evaluation
of the conservation status of oak species
and their global importance, there is great
potential to use oaks as indicators of the
impacts of climate change.
Box 1: Conservation of Quercus hinckleyi
San Antonio Botanical Garden, Texas, is helping to conserve the Critically
Endangered Quercus hinckleyi as part of the Center of Plant Conservation
(CPC) National Collections scheme for endangered plants of the USA.
Acorns have been collected from the wild for propagation within the
Garden, which maintains and monitors plants of this species in field test
plots and within the Garden grounds. The species is listed on the US
Endangered Species Act and a recovery plan was devised in 1992.
Source: http://www.centerforplantconservation.org
7
The Red List of Oaks
REFERENCES
Coombes, A., Rodriguez-Coombes,
M., Valencia-A, S. & Zavala-C, F.
(2004). Report on a meeting to assess
the status of threatened oaks in Mexico.
Unpublished report, Fauna & Flora
International, Cambridge.
Coombes, A., & Rodriguez-Coombes,
M. (2007). E-mail correspondence with
Sara Oldfield.
Flora of China Editorial Committee
(eds) (1999). Flora of China, Volume 4
(Cycadaceae through Fagaceae).
Science Press, Beijing and Missouri
Botanical Garden Press, St Louis.
Garfì, G. (2006). E-mail correspondence
with Sara Oldfield.
Global Tree Specialist Group (2005).
Globally Threatened Trees of the
Caucasus. A report on the Caucasus
regional tree Red Listing workshop
(Tbilisi, Georgia, 26–28 September
2005). IUCN/SSC Global Tree Specialist
Group.
Govaerts, R. & Frodin, D.G. (1998).
World Checklist and Bibliography of
Fagales (Betulaceae, Corylaceae,
Fagaceae and Ticodendraceae). Royal
Botanic Gardens, Kew, Richmond, UK.
Herrera, B. & Chaverri, A. (2006).
Criteria and indicators for sustainable
management of Central American
montane oak forests. In: Kappelle, M.
(ed.) Ecology and conservation of
Neotropical montane oak forests.
Ecological Studies No. 185. SpringerVerlag, Berlin.
Lorimer, C.G. (2003). Editorial:
the decline of oak forests.
http://www.aibs.org/bioscienceeditorials/editorial_2003_10.html
8
Kappelle, M. (ed.) (2006a). Ecology
and conservation of neotropical
montane oak forests. Ecological Studies
No. 185. Springer-Verlag, Berlin.
Kappelle, M. (2006b). Neotropical
montane oak forests: overview and
outlook. In: Kappelle, M. (ed.). Ecology
and conservation of neotropical
montane oak forests. Ecological Studies
No. 185. Springer-Verlag, Berlin.
Newton, A. (2007). Conservation status
of Mexican cloud forest tree species
Report of Red List Workshop 13th –
15th May 2007, ECOSUR, San
Cristobal de las Casas, Chiapas,
Mexico. Unpublished report, Fauna &
Flora International, Cambridge.
Pignatti, S. (1982). Flora d’Italia. 1-3.
Edagricole, Bologna.
Pritchard, H. (2007). Quercus seed
conservation: a digest. Unpublished
document prepared by Dr H. Pritchard
of the Millennium Seed Bank, Royal
Botanic Gardens Kew.
Ramírez-Marcial, N., Camacho-Cruz,
A. & González-Espinosa, M. (2005).
Potencial florístico para la restauración
de bosques en Los Altos y Montañas
del Norte de Chiapas. Pp. 325–369 in:
González-Espinosa, M., RamírezMarcial, N. & Ruiz-Montoya, L. (eds).
Diversidad Biológica en Chiapas. Plaza
& Valdés, Mexico City.
Rodriguez-Acosta, M. & Coombes, A.
(2000). Estrategia de Conservación de
Quercus hintonii. Reporte Final. Fauna &
Flora International. Referencia 99429.
BUAP, Puebla, Puebla, Mexico.
Tellez-Valdes, O. (2006). Biological
diversity, conservation and climate
change in Mexico. Presentation given at
the Second Meeting of the Gran
Canaria Group on Climate Change and
Plant Conservation. Las Palmas de
Gran Canaria, Spain. 10-11 April 2006.
Valencia-A., S. (2004). Diversidad del
género Quercus (Fagaceae) en México.
Bol. Soc. Bot. Méx. 75: 33–53.
Vivero, J.L., Szejner, M., Gordon, J.
and Magin, G. (2006). The Red List of
Trees of Guatemala. Fauna & Flora
International, Cambridge.
Zhou Yue, Zhang Jun, Luo Hua-Song,
Xu Qiang (2001). Tensile strength in
lateral roots of Pinus and
Cyclobalanopsis and its significance in
maintaining slope stability in a shelterforest system. Acta Phytoecologica
Sinica. 25(1):105-109.
The Red List of Oaks
GLOBALLY THREATENED OAKS
Quercus acerifolia (E.J.Palmer) Stoynoff & Hess
EN B1ac(iv)+2ac(iv)
USA (Arkansas)
Six localities of Q. acerifolia are currently known in the Magazine
and Ouachita Mountains, Arkansas (Logan, Montgomery, Polk,
Sebastian). Populations are small, usually not numbering more
than a few hundred individuals. The species distribution in
Oklahoma is currently under review.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 4
Quercus acrodonta Seemen
DD
China (Gansu, Guizhou, Henan, Hubei, Sichuan, Shaanxi,
Yunnan)
Although a fairly widespread species, it is not common and
populations tend to be small. Found in valleys and mountains
from 300–2300 m.
Assessor: Zhekun Zhou et al.
Refs: 2, 10, 12
Quercus ajoensis C.H.Mull.
VU B2ab(iii)
Mexico (Baja California), USA (Arizona, Colorado)
The species is considered to be Vulnerable in the USA and has
a very limited distribution in Mexico, where it is thought to be
Endangered. The taxon is part of a poorly understood species
complex which requires taxonomic revision. In Mexico the
species has been virtually uncollected since the first half of the
20th century. It has no formal protection status. The IUCN
category and criteria are provisional, based on available
information.
Assessor: Global Tree Specialist Group
Refs: 2, 4, 8, 28
Quercus albicaulis Chun & W.C.Ko
CR D
China (Hainan)
This species is known to occur in only one province, Hainan.
However, there have been no recent records and it is possibly
extinct. Found in mesophytic forests from 200–600 m. Treated
as Cyclobalanopsis albicaulis (Chun & W.C.Ko) Y.C.Hsu & H.Wei
Jen in the Flora of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 10, 12
Quercus alpestris Boiss.
EN B1ab(iii)+2ab(iii)
Spain
The taxon is restricted to one population in the western high
mountains of Málaga province in the Sierra de las Nieves and
Tolox. Threats to the taxon include poor natural regeneration,
over-grazing, loss of habitat, fire and soil erosion. Although the
taxon is considered to fall within Quercus faginea Lam. s.l.
by some taxonomists, this isolated population is still of
great conservation interest and importance. A population
augmentation programme was recently established for the
species.
Assessor: B. Cabezudo, Y. Gil, D. Navas, P. Navas & A.V.
Pérez Latorre
Refs: 24, 26
Quercus alnifolia Poech
VU B1ab(iii)
Cyprus (Troodos Mountains)
Restricted to the Troodos massif in south-west Cyprus, this
endemic oak is found on volcanic and serpentine soils at midelevations. Habitat degradation by fire, grazing, wood cutting
and development threaten the species.
Assessor: Global Tree Specialist Group
Refs: 2, 25
Quercus argyrotricha A.Camus
EN D
China (Guizhou)
The species is known from only two localities in one province,
occurring in broadleaved evergreen forest at around 1600 m.
It is treated as Cyclobalanopsis argyrotricha (A.Camus) Chun
& Y.T.Chang ex Y.C.Hsu & H.Wei Jen in the Flora of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 10, 12
Quercus arkansana Sarg.
VU B1ab(iii)
USA (Alabama, Arkansas, Florida, Georgia, Louisiana, Texas)
Endemic to the Gulf of Mexico, Q. arkansana has a scattered
distribution with small fragmented populations. It is threatened
by habitat conversion into forestry plantations and farmland.
However, relatively large healthy populations of the species still
occur in Florida, some numbering several thousand individuals.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 3, 4
9
The Red List of Oaks
Quercus aucheri Jaub. & Spach
NT
Greece, Turkey
A small tree very similar to Q. coccifera L. It grows in the Aegean
region on the Greek islands and in Anatolia, Turkey. Recorded in
the Turkish Red Data Book as Low Risk (Conservation
Dependent). Populations are localised and isolated.
Assessor: Adil Güner
Refs: 1, 2
Quercus austrocochinchinensis Hickel & A.Camus
DD
China (Yunnan), Laos, Thailand, Viet Nam
Although considered to be Critically Endangered in China, with
very few individuals known, the extent of distribution of the
species in neighbouring countries is unknown. It is treated as
Cyclobalanopsis austrocochinchinensis (Hickel & A.Camus)
Hjelmq. in the Flora of China.
Assessor: Global Tree Specialist Group
Refs: 12
Quercus austroglauca (Y.T.Chang) Y.T.Chang
EN D
China (Yunnan)
Only found in south-east Yunnan in broadleaved evergreen
forests, 800–1500 m. Treated as Cyclobalanopsis austroglauca
Y.T.Chang in the Flora of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 10, 12
Quercus bawanglingensis C.Huang, Z.X.Li & F.W.Xing
CR D
China (Hainan)
Found growing on limestone in mountains at around 1000 m.
The taxonomic status of this species is uncertain and it is
thought to be closely related to Q. phillyreoides A.Gray, which is
a widely distributed species.
Assessor: Zhekun Zhou et al.
Refs: 5, 10, 12
Quercus benthamii A.DC.
VU A2cd
Costa Rica, Guatemala, Mexico (Chiapas, Oaxaca), Panama
This species is found in wet montane forest at 1500–3000 m and
is typically used for firewood and charcoal. In Chiapas, Mexico it
is sparsely distributed along the Sierra Madre (mostly in southern
areas close to Guatemala), and in the northern mountains.
10
Mature individuals can reach up to 40 m high, as at the El Triunfo
Biosphere Reserve (Chiapas). Outside protected areas, the
species is threatened by logging and habitat destruction.
Q. rapurahuensis Pittier ex Seemen (distribution Costa Rica and
Panama) is now considered a synonym of this species.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 6, 8, 30, 36
Quercus boyntonii Beadle
CR B1ab(iii)
USA (Alabama, Texas)
The species is only known from a few localities in Texas and
Alabama. The population in Alabama appears healthy and is
under conservation protection. However, it may have been
extirpated in Texas as most of its habitat has been converted to
forestry plantations or pasture land.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 3, 4
Quercus brandegeei Goldman
EN B1ab(iii,v)
Mexico (Baja California)
The species occurs at low densities in xeric habitat in the foothills
of the Sierra Lazaro. The area is subject to grazing pressure and
no regeneration has been observed in recent years.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus brenesii Trel.
DD
Costa Rica
A taxonomically doubtful species, apparently endemic to the
department of Alajuela. Recently considered a synonym of
Q. cortesii Liebm.
Assessor: K. Nixon et al.
Refs: 1, 2
Quercus bumelioides Liebm.
NT
Costa Rica, Guatemala, Honduras, Mexico (Chiapas),
Nicaragua, Panama
Although previously evaluated as Vulnerable, a recent
assessment in Guatemala indicates this taxon is less threatened.
In Guatemala the taxon is NT and is a dominant species of
montane cloud forest (1500–3200 m). Its timber is valued for its
strength and durability and is used to make furniture, posts,
floorboards and tools. In Mexico it is considered Vulnerable due
The Red List of Oaks
to habitat loss and logging, and it has become locally extinct in
extensive areas of northern Chiapas. It is also considered
Endangered in Panama. More information is required on its
status elsewhere in the region. The species is highly variable,
leading to a complicated taxonomy and many synonyms, one of
which is Q. sapotifolia Liebm.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 6, 7, 30, 35
Quercus carmenensis C.H.Mull.
NT
Mexico (Coahuila), USA (south-west Texas)
This species is only known from the Sierra del Carmen region in
Coahuila, Mexico and the Chisos Mountains, Texas. It is
considered to be threatened in Texas. The taxonomic status of
the species is uncertain.
Assessor: Global Tree Specialist Group
Refs: 2, 4, 8, 28
Quercus cedrosensis C.H.Mull.
VU B2ab(iii)
Mexico (Baja California), USA (California)
A species restricted to sclerophyllous vegetation in both lowland
and mountainous areas. It occurs on Cedros Island where the
vegetation suffers from over-grazing by goats. Recent surveys
by the California Native Plant Society have discovered four new
localities near Otay Mountain, San Diego, California, where it is
considered rare.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 4, 11
Quercus chapensis Hickel & A.Camus
DD
China, Laos, Thailand, Viet Nam
Although only known from one population in China (south and
south-east Yunnan), the species is fairly well distributed in
South-East Asia. It is treated as Cyclobalanopsis chapensis
(Hickel & A.Camus) Y.C.Hsu & H.Wei Jen in the Flora of China.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 10, 12
Quercus chenii Nakai
DD
China (Anhui, Fujian, Henan, Hubei, Hunan, Jiangsu, Jiangxi,
Shandong, Sichuan, Zhejiang)
The species has a wide distribution in China, but populations
tend to be small and fragmented. There is some uncertainty as
to its taxonomic status as some taxonomists consider it a close
relative of Q. acutissima Carruth.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus chrysocalyx Hickel & A.Camus
DD
Cambodia, China, Laos, Thailand, Viet Nam
In China the species is considered to be Critically Endangered
and is only known from one herbarium collection. However, it
has a wider distribution in South-East Asia where its status is
not known.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 12
Quercus chrysotricha A.Camus
NT
Malaysia (Sarawak, Sabah), Indonesia (Kalimantan)
Endemic to Borneo, the species is known to occur at five
localities in lowland Kerangas forest to mid-altitude (1200–1300
m) montane forest in Sarawak and Sabah. The species has also
been recorded in Kalimantan. The species may be at threat from
shifting agriculture.
Assessor: Rusea Go & Lillian Chua
Refs: 2, 18, 22
Quercus coahuilensis Nixon & C.H.Mull.
DD
Mexico (Coahuila, Chihuahua)
A locally abundant narrow endemic, this species may prove to
be threatened when the area of occupancy is calculated, taking
into account its altitudinal range (2000–3550 m). It is in need of
taxonomic revision.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8, 28
Quercus convallata Trel.
DD
Mexico (Jalisco, Nayarit, Durango, Zacatecas)
A locally common endemic with dubious taxonomy which, with
further morphometric investigation, may prove to be a synonym
of Q. obtusata Bonpl.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8, 28
11
The Red List of Oaks
Quercus costaricensis Liebm.
NT
Costa Rica, Panama
Occurring in the montane forest of Volcáa Irázu and Cerro
Chirripó up to 3000 m, the species is restricted to an area of
less than 2000 km². Although deforestation has been extensive
in the past, these areas are now given some degree of
protection. The main population of this species occurs within
La Amistad National Park.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 30, 31
Quercus crispifolia Trel.
NT
Mexico (Chiapas, Guerrero, Oaxaca), Guatemala, El Salvador
In Guatemala the species occurs in rainforests between 900–
1550 m and is considered Near Threatened. In Mexico, the forest
cover in most of the localities where it has been previously
collected has disappeared, due to conversion into coffee
plantations. It has not been collected during the last 50–60 years.
Assessor: Global Tree Specialist Group
Refs: 2, 6, 7, 30
Quercus cualensis L.M.González
DD
Mexico (Jalisco)
Currently very little information is known about this Mexican
endemic species, other than that it occurs in the state of Jalisco
at altitudes of 1800–2420 m.
Assessor: A. Coombes et al.
Refs: 7, 8
Quercus cupreata Trel. & C.H.Mull.
DD
Mexico (Nuevo León)
Currently very little information is known about this Mexican
endemic species, other than that it occurs in the state of Nuevo
León.
Assessor: A. Coombes et al.
Refs: 2, 7, 8
Quercus daimingshanensis (S.K.Lee) C.C.Huang
EN D
China (Guangxi)
This species is restricted to one mountain range in the province
of Guangxi, where it occurs in mixed mesophytic forests. It is
treated as Cyclobalanopsis daimingshanensis S.K.Lee in the
12
Flora of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 10, 12
Quercus delicatula Chun & Tsiang
CR D
China (Guangdong, Guangxi, Hunan)
The species has been recorded as occurring in the provinces
of Guangdong, Guangxi and Hunan and is well represented in
herbaria. However, there is now only one population left of this
species. It is treated as Cyclobalanopsis delicatula (Chun &
Tsiang) Y.C.Hsu & H.Wei Jen in the Flora of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus deliquescens C.H.Mull.
VU D2
Mexico (Chihuahua)
A species of dry montane scrub known only from one population
system in the valley of Río Concho and north along Río Grande.
Assessor: K. Nixon et al.
Refs: 1, 2, 8
Quercus depressa Bonpl.
DD
Mexico (Hidalgo, Oaxaca, Puebla, Veracruz)
A species endemic to four states in Mexico. Records indicate it
grows at altitudes of 1800–2600 m.
Assessor: A. Coombes et al.
Refs: 2, 7, 8
Quercus devia Goldman
VU D2
Mexico (Baja California Sur)
Two or three populations occur in dry montane forest, at
altitudes of 2600 m where grazing pressure is high. The
mainland Mexican species, Q. viminea Trel., may be
synonymous, in which case the species would qualify for a
status of lower risk.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 7, 8
Quercus disciformis Chun & Tsiang
VU D1
China (Guangdong, Guangxi, Guizhou, Hainan, Hunan)
The species is recorded to occur in five provinces and is well
represented in herbaria. However, there are now only three
The Red List of Oaks
populations left in China. It is treated as Cyclobalanopsis
disciformis (Chun & Tsiang) Y.C.Hsu & H.Wei Jen in the Flora
of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus dumosa Nutt.
EN A2(c)
Mexico (Baja California), USA (California)
A number of populations (e.g. Santa Barbara, Hollywood and
Griffith Park) have disappeared. The lowland scrub habitat of
the remaining populations is under threat from pollution and the
expansion of urban and industrial areas. A recent inventory
commissioned by the California Native Plant Society recorded
16 separate localities for the species. However, it is considered
to be threatened in 80 per cent of these localities, with
development still being the greatest threat. The status in Mexico
is not known.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8, 11
Quercus duratifolia C.H.Mull.
DD
Mexico (Chiapas)
Very little information has been gathered about this supposedly
endemic species of Chiapas. It is known only from the southern
Sierra Madre of Chiapas and has been considered a synonym
of Q. sapotifolia Liebm., which is thought not to be threatened.
Assessor: Global Tree Specialist Group
Refs: 2, 7, 8, 30
Quercus edithiae Skan
NT
China, Viet Nam
The species is considered to be Vulnerable in China as it is now
thought to occur in only one province, Hainan. There are records
of it occurring in Guangdong, Guangxi and Hainan in the Flora
of China, where it is treated as Cyclobalanopsis edithiae (Skan)
Schottky in the Flora of China.
Assessor: Global Tree Specialist Group
Refs: 2, 10, 12
Quercus engelmannii Greene
VU A2(c)
Mexico (Baja California), USA (California)
Extensive declines of the sclerophyllous habitat of this species
have been observed over the past 50 years. Regeneration of
the species is poor and the remaining habitat is under threat
from grazing and urban, agricultural and industrial
developments. Only one tree remains on Santa Catalina Island
in California, but a part of the population on Santa Rosa is
protected in the Santa Rosa Plateau Reserve.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus fimbriata Y.C.Hsu & H.Wei Jen
CR D
China (Sichuan, Yunnan)
Although recorded to occur in the provinces of Sichuan and
Yunnan, the species has not been found recently. There is also
some uncertainty regarding its taxonomic status as it may be a
hybrid of Q. dolicholepis A.Camus and Q. aquifolioides Rehder
& E.H.Wilson.
Assessor: Zhekun Zhou
Refs: 2, 5, 10, 12
Quercus flagellifera Trel.
VU A2cd
Guatemala
Grows in mixed wet or rainforest at 1250–2500 m. It is
distributed throughout the mountains in the east and central part
of Guatemala and is a difficult species to identify. This and other
species of the genus require taxonomic study using molecular
techniques.
Assessor: J.L. Vivero & M. Szejner
Refs: 1, 6, 30
Quercus gaharuensis Soepadmo
VU A2c
Malaysia (Sarawak, Sabah, Peninsular Malaysia), Indonesia
(Sumatra)
The species is known to occur at a number of localities
throughout Malaysia and the island of Sumatra. The species’
habitat is threatened by land conversion and logging.
Assessor: Rusea Go & Lillian Chua
Refs: 2, 18, 20, 21
Quercus galeanensis C.H.Mull.
VU D2
Mexico (Nuevo León, Tamaulipas)
A rare species characterised by the leaves being vertically
appressed to the twigs. Occurring in submontane to montane
chaparral, it is restricted to two populations occupying a narrow
band (150 km x 10–20 km) from Galeana, Nuevo León to the
13
The Red List of Oaks
Miquihrana region in Tamaulipas.
Assessor: Global Tree Specialist Group
Refs: 1, 2
Quercus georgiana M.A.Curtis
EN B1ab(iii,iv)+2ab(iii,iv)
USA (Alabama, Georgia)
The species is restricted to small isolated populations on granite
outcrops, occupying an area less than 500 km². Drought, poor
regeneration, soil erosion and compaction all threaten the
species and on Stone Mountain the impact of tourism is
considerable. It has been extirpated in South Carolina but in
Georgia it still occurs on granite outcrops in 14 counties.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 4
Quercus germana Schltdl. & Cham.
VU A1c
Mexico (Hidalgo, Oaxaca, Puebla, San Luis Potosi,
Tamaulipas, Veracruz)
A species of submontane, seasonal dry forest which has
experienced dramatic declines over the last few decades. Forest
has been converted for agricultural use, especially coffee
plantations.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus graciliformis C.H.Mull.
CR B1ab(iii); C2b
USA (Texas)
One small isolated population exists in riparian oak woodland in
mesic canyons in the Chisos Mountains. The distribution covers
an extremely limited area (<65 km²) in Brewster County. The
locality is threatened by the activities of tourists from a nearby
camping ground and by occasional drought.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 4
Quercus gulielmitreleasei C.H.Mull.
NT
Costa Rica, Panama
The taxonomic status of the species is uncertain. It is confined
to Chiriquí in Costa Rica and Cartago in Panama in wet montane
forests. It is considered Endangered in Panama.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 31, 35
14
Quercus hinckleyi C.H.Mull.
CR A2ace; B1ab(iii)+2ab(iii)
Mexico (Chihuahua, Sonora), USA (Texas)
A narrow endemic with holly-like leaves known from isolated
populations, most of which are in the Big Bend Ranch State
Natural Area. Most populations consist of fewer than 100
individuals and cover an area of less than 2 hectares. Gene flow
between the existing populations is thought to be virtually
impossible. Historical climate change is thought to be the main
factor that has caused the species to have such a restricted
range today. Hybridization with other Quercus species, roadway
construction, collecting by horticulturists, drought and grazing
are threats. Although acorn yields are good, all reproduction
appears to be vegetative. The species is listed on the US
Endangered Species Act and a recovery plan was devised in
1992. Mexican populations, if they exist, are completely
unprotected and subjected to heavy grazing pressure.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 4, 8, 28
Quercus hintonii E.F.Warb.
EN A1cd+2cd; B1 ab(i,ii,iii,iv)+2ab(i,ii,iii,iv)
Mexico (México State)
Previously considered to be Critically Endangered, extensive
field work and mapping have yielded more information on the
species and its status has changed accordingly. The species is
confined to three main localities in Mexico State: between
Temascalttepec and Tejupilco, Sierra de Goleta and Sierra de
Nanchititla. It grows on steep mountain slopes at 1400–2000
m in mixed dry pine–oak forest. Much of the area is in the
process of conversion into avocado plantations and human
settlements. There has also been a huge reduction in forest area
due to agricultural expansion and logging. A previously recorded
locality in neighbouring Michoacan no longer exists.
Assessor: A. Coombes et al.
Refs: 1, 2, 8, 13
Quercus hintoniorum Nixon & C.H.Mull.
VU D2
Mexico (Nuevo León, Coahuila)
A montane forest species occurring in two locations close to
each other in the Sierra Lamata.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
The Red List of Oaks
Quercus hirtiifolia Vázquez-Villagrán, Valencia & Nixon
DD
Mexico (Hidalgo, Puebla)
A recently described species with no information on distribution
or status.
Assessor: A. Coombes et al.
Refs: 7, 8, 14
fragmented. In Chiapas it has been collected in scattered
locations along the Sierra Madre and in the Northern Mountains
region. At lower altitudes its habitat is being logged to make way
for coffee plantations. Its timber is used for construction, fuel
and handicrafts.
Assessor: Global Tree Specialist Group
Refs: 2, 6, 7, 8, 15, 35
Quercus hypophaea Hayata
NT
Taiwan
Endemic to the east and south parts of Taiwan.
Assessor: Yu-pin Cheng
Refs: 2, 17
Quercus invaginata Trel.
NT
Mexico (Coahuila, Chihuahua, Nuevo León)
It is suspected that the species will prove to be threatened when
the area of occupancy is calculated, taking into account its
altitudinal range.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus hypoxantha Trel.
NT
Mexico (Coahuila, Nuevo León, San Luis Potosí)
It is suspected that this species will prove to be threatened when
the area of occupancy is calculated, taking into account its
altitudinal range.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus ilex L. subsp. ballota (Desf.) Samp.
NT
Portugal, Spain
This species is present in a large part of the Iberian Peninsula
within areas of lowland dry forest. It is locally abundant, forming
extensive woodlands in places. Previous threats from overcutting and expanding agriculture have now ceased, although
there is still a high risk of fire. The trees are legally protected
throughout the range.
Assessor: J.L. Vivero et al.
Refs: 1, 26
Quercus insignis M.Martens & Galeotti
NT
Mexico (Oaxaca, Veracruz), Guatemala, Belize, Honduras,
Nicaragua, Costa Rica, Panama
The species appears to have a wide distribution in Central
America. However, it is considered threatened in Mexico
(Endangered), Panama (Endangered) and Guatemala (Near
Threatened), although reports indicate that it is still abundant in
Nicaragua. The species grows in mountains in rainforest and
cloud forest at 800–3000 m. In Mexico, the species has a very
restricted distribution and populations tend to be small and
Quercus jinpinensis (Y.C.Hsu & H.Wei Jen) C.C.Huang
CR D
China (Yunnan)
Only known from the type locality in south-east Yunnan. Treated
as Cyclobalanopsis jinpinensis Y.C.Hsu & H.Wei Jen in the Flora
of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 10, 12
Quercus kerangasensis Soepadmo
DD
Brunei, Malaysia (Sarawak), Indonesia (central Kalimantan)
The species is endemic to Borneo where it has been recorded
from a few localities. It is considered Vulnerable in Sarawak
(Malaysia) where it is found in lowland Kerangas forest. The
record from central Kalimantan may be an incorrect
identification.
Assessor: Rusea Go & Lillian Chua
Refs: 2, 18, 19
Quercus kotschyana O.Schwarz
DD
Lebanon
Contact with botanists in Lebanon has not revealed any current
knowledge on the status of this species.
Assessor: Global Tree Specialist Group
Ref: 2
15
The Red List of Oaks
Quercus kouangsiensis A.Camus
EN D
China
The species has been recorded to occur in the provinces of
Guangdong, Guangxi, Hunan and Yunnan in wet, broadleaved
evergreen forests (200–2000 m). However, it is now probably
only present in Hainan as all the other localities have been lost.
It is treated as Cyclobalanopsis kouangsiensis (A.Camus)
Y.C.Hsu & H.Wei Jen in the Flora of China and considered to
be closely related to C. thorelii (Hickel & A.Camus) Hu.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus leiophylla A.DC.
NT
Mexico (Jalisco, Veracruz)
In the Huatusco region of Veracruz, Q. leiophylla acorns are
collected and used to produce religious and decorative artefacts.
Assessor: A. Coombes et al.
Refs: 2, 7, 8, 15
Quercus litseoides Dunn
DD
China (Guangdong, Guangxi, Hong Kong)
The species is treated as Cyclobalanopsis litseoides (Dunn)
Schottky in the Flora of China and is recorded as occurring in
forests at 700–1000 m. A revision of this and other small-leaved
Quercus species in the region is required.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus lodicosa O.E.Warb. & E.F.Warb.
DD
China (south-east Tibet), India (Assam), Myanmar
Although the species is considered to be Endangered in China,
it has a wider distribution into India and northern Myanmar.
Assessor: Global Tree Specialist Group
Refs: 2, 12
Quercus macdougallii Martínez
VU D2
Mexico (Oaxaca)
A distinctive species known only from the type locality in the dry
montane forests of Oaxaca. It has not been collected recently
and it is biologically poorly known.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
16
Quercus marlipoensis Hu & W.C.Cheng
CR D
China (Yunnan)
Known to exist only from the type locality. Taxonomically very
close to Q. engleriana Seemen and may in fact be the same
species.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus martinezii C.H.Mull.
DD
Mexico (Guerrero, Jalisco, México State, Michoacán, Nayarit,
Oaxaca)
Grows at altitudes of 1800–2600 m.
Assessor: A. Coombes et al.
Refs: 2, 7, 8
Quercus miquihuanensis Nixon & C.H.Mull.
EN B1ab(iii)+2ab(iii)
Mexico (Nuevo León, Tamaulipas)
An endemic of Peña Nevada and Miquihuana, locally common
in montane pine–oak forest and also chaparral, covering an area
of less than 500 km². Logging activities and over-grazing
threaten the habitat.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus monterreyensis Trel. & C.H.Mull.
DD
Mexico (Nuevo León)
Grows at altitudes of 600–1300 m.
Assessor: A. Coombes et al.
Refs: 2, 7, 8
Quercus mulleri Martínez
DD
Mexico (Oaxaca)
Grows at altitudes of 1000–1800 m.
Assessor: A. Coombes et al.
Refs: 7, 8
Quercus nixoniana Valencia & Lozada
DD
Mexico (Guerrero, Jalisco, Oaxaca)
Found at altitudes of 1300–2300 m.
Assessor: A. Coombes et al.
Refs: 7, 8
The Red List of Oaks
Quercus obovatifolia C.C.Huang
CR B2ab(iii)
China (Fujian, Guangdong, south Hunan)
Thought to now only occur on a few mountain tops in
broadleaved evergreen forests, 1600–1800 m. Treated as
Cyclobalanopsis obovatifolia (C.C.Huang) Q.F.Zheng in the Flora
of China.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus oglethorpensis W.H.Duncan
EN B1ab(iii)+ 2ab(iii)
USA (Georgia, Mississippi, South Carolina, Louisiana)
Although distributed in four states, populations of this species
are small and severely fragmented. It is known from a small area
in the piedmont of north-east Georgia, neighbouring western
South Carolina and a disjunct population in Mississippi. In total,
approximately 1000 individuals, covering an area of occupancy
less than 150 km², are estimated to exist. The most common
habitats are roadsides and old fence rows. A survey in 1985
failed to locate 11 per cent of the previously known sites.
Changes in land use continue to be the biggest threat to this
species. Poor seed viability and chestnut blight are also
reported.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 4
Quercus orocantabrica Rivas Mart., Penas, T.E.Díaz &
Llamas
EN B1ab(iii)+2ab(iii)
Spain
The species is endemic to the north of Spain (Cantabrian
Mountains, Montes de León and Sierra Segundera). It occurs
in small patches along the tree line at altitudes of 1400–1800
m, on rocky siliceous substrates. The species is threatened by
frequent burning and conversion to pine plantations.
Assessor: F. Llamas & C. Acedo
Ref: 27
Quercus pachucana Zavala-Chávez
DD
Mexico (Hidalgo)
Found at altitudes of 2800–2900 m.
Assessor: A. Coombes et al.
Refs: 7, 8
Quercus pacifica Nixon & C.H.Mull.
VU D2
USA (California)
Found on three Channel Islands in California.
Assessor: Global Tree Specialist Group
Refs: 2, 4
Quercus parvula Greene var. parvula
EN B1ab(ii,iii)+2ab(ii,iii)
USA (California)
Two small populations on Santa Cruz Island and five to six
populations in Santa Barbara County are known. Occurring in
maritime chaparral and pine forests, no population extends over
more than 10 km². Habitat degradation and grazing are threats
on Santa Cruz Island. The Flora of North America considers the
three varieties of Q. parvula to be Q. wislizenii A.DC.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 11, 16
Quercus parvula var. tamalpaisensis S.K.Langer
EN B2ab(i)
USA (California)
A localised endemic variety confined to Mount Tamalpais in
Marin County. The number of localities and individual plants is
small. The Flora of North America considers the three varieties
of Q. parvula to be Q. wislizenii A.DC.
Assessor: Global Tree Specialist Group
Refs: 2, 4, 16
Quercus pauciradiata Penas, Llamas, Pérez Morales & Acedo
CR B2ab(iii)
Spain
The species is endemic to the north-east of León province,
where only one population is now known to occur. Threats to the
species include poor regeneration (imbalance of sex ratios, low
seed viability), small population size and hybridization. A small
population in the Picos de Europa Regional Park has recently
become extinct. The total area of occupancy is not more than
5 km². The population is now included in an LIC (Site of
Community Interest) which affords it some protection.
Assessor: F. Llamas, C. Acedo, R. Alonso & C. Lence
Refs: 24, 26
17
The Red List of Oaks
Quercus paxtalensis C.H.Mull.
NT
Mexico (Chiapas)
Very little appears to be known about this species endemic to
Chiapas. It has been considered to be a synonym of Q. cortesii
Liebm. Its current distribution range is reduced by frequent fires,
grazing and forest logging.
Assessor: Global Tree Specialist Group
Refs: 2, 7, 8, 30
Quercus peninsularis Trel.
DD
Mexico (Baja California)
A montane species for which the number of localities and
conservation status remain unknown.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus percoriacea Soepadmo
VU A2c; B1ab(iii)
Malaysia (Sarawak), Brunei
The species is restricted to a few localities in Sarawak and
Brunei. In Sarawak it is found in primary Kerangas forest at
altitudes of 1000–1200 m. In Brunei the species has been
recorded to occur on brown clay-loam soils at altitudes of 480–
540 m. Logging is a potential threat in certain areas.
Assessor: Rusea Go & Lillian Chua
Refs: 2, 18, 19, 20
Quercus perpallida Trel.
DD
Mexico (Baja California, Chihuahua, Sinaloa, Sonora).
In western Chihuahua and adjacent Sonora, this species is
reported to be occasional at lower elevations in canyons, often
mixed with Q. oblongifolia Torr.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 29
Quercus polymorpha Schltdl. & Cham.
NT
Mexico (Chiapas, Hidalgo, Nuevo León, Oaxaca, Puebla),
Guatemala, USA (Texas)
The species is found in both dry and wet oak forests at altitudes
of 900–1200 m. Its distribution ranges from eastern Sierra
Madre (Mexico) to Guatemala, with one population in Texas. In
Guatemala it is restricted to a few mountain ranges and is
considered Vulnerable.
Assessor: Global Tree Specialist Group
Refs: 2, 4, 6, 8, 30
18
Quercus pontica K.Koch
VU B1ab(iii)
Georgia, Turkey
A species with a very narrow distribution limited to the southern
Caucasus (Georgia and Turkey). A tertiary relict, it is found in the
Colkhic forests of Georgia as well as at sub-alpine elevations on
acidic soils. In Georgia it is threatened by over-grazing where it
occurs on the timberline.
Assessor: Global Tree Specialist Group
Refs: 2, 9
Quercus purulhana Trel.
VU A2c
Belize, Guatemala, Honduras, Nicaragua, Mexico (Chiapas)
A montane forest species, abundant in some areas but subject
to general declines in habitat. In Chiapas it has been collected
in highly seasonal and frost-free habitats with dry oak and pine–
oak forests at 1060–1600 m elevation.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 30
Quercus repanda Bonpl.
NT
Mexico (Hidalgo, Puebla, Tlaxcala, San Luis Potosí, Veracruz)
Found at altitudes of 1700–2800 m. It is a relatively rare species
that has not been protected.
Assessor: Global Tree Specialist Group
Refs: 2, 7, 8, 30
Quercus repandifolia Liao
VU B2 a(i)b(iii)
Taiwan
Only found in the south-eastern part of Taiwan and restricted to
small areas. It is considered by some taxonomists as a synonym
of Q. glauca Thunb., which is widely distributed in Asia. This
species may also be distributed in China, in which case its
conservation status will need to be re-assessed.
Assessor: Yu-pin Cheng
Ref: 17
Quercus rex Hemsl.
DD
China (Yunnan), India (north-east), Laos, Myanmar, Viet Nam
Although the species is considered Critically Endangered in
China (possibly as it is at the edge of its distribution range), it
occurs in other neighbouring countries where its conservation
status is not yet known.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 12
The Red List of Oaks
Quercus robur subsp. imeretina (Steven ex Woronow)
Menitsky
VU 2ab (iii,v)
Georgia, Russia
A rare tree found only in western Georgia and the Black Sea
coast in Russia. The population is in decline due to felling and
agriculture. The wood is considered as valuable timber. There is
some uncertainty as to its taxonomic status.
Assessor: Global Tree Specialist Group
Refs: 2, 9
Quercus rysophylla Weatherby
NT
Mexico (Nuevo León, San Luis Potosí, Tamaulipas)
The species is scarce and populations are fragmented.
Assessor: Global Tree Specialist Group
Refs: 7, 8, 12
Quercus saltillensis Trel.
DD
Mexico (Coahuila, Nuevo León)
Assessor: A. Coombes et al.
Refs: 2, 7, 8
Quercus saravanensis A.Camus
DD
China (Yunnan), Laos, Viet Nam
Although considered Endangered in China (possibly at the edge
of its distribution range), it occurs in neighbouring countries
where more information is needed. Found in wet forests in
mountains at around 1700 m. Treated as Cyclobalanopsis
saravanensis (A.Camus) Hjelmq. in the Flora of China.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 10, 12
Quercus sebifera Trel.
NT
Mexico (Chiapas, Hidalgo, Nuevo León, Oaxaca, Puebla, San
Luis Potosí)
A low shrubby species, usually less than 2 m high, found
growing in dense mats by rhizome propagation, usually at
altitudes of 1600–2400 m. It is frequently found on dried, infertile
soils. Much of its habitat is severely altered by over-grazing.
Assessor: Global Tree Specialist Group
Refs: 2, 7, 8, 30
Quercus sichourensis (Hu) C.C.Huang & Y.T.Chang
CR D
China (Yunnan)
Only known from type locality in south-east Yunnan. Treated as
Cyclobalanopsis sichourensis Y.C.Hu in the Flora of China.
Found in broadleaved evergreen forests, 800–1500 m.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus skinneri Benth.
NT
El Salvador, Guatemala, Honduras, Mexico (Chiapas, Oaxaca,
Veracruz), Nicaragua
The species is widespread and often occurs in abundance in
moist montane forests. It is also frequently planted. General
rates of deforestation in recent decades have, however, caused
significant population declines. In Guatemala the species is
considered Near Threatened and grows in rainforest and mixed
forests on the Pacific plains and on volcanic slopes at 1000–
2400 m. Populations in some areas of Guatemala and Mexico
have been considerably reduced. The species is very
polymorphic in Central America and its differentiation from
Q. xalapensis Bonpl. is not always clear. In Quetzaltenango the
leaves are used to fertilize fields.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 6, 30
Quercus skutchii Trel.
EN A2cd
Guatemala, Mexico (Chiapas)
It is considered Endangered in Guatemala, where it is found on
plains and dry montane slopes at 1800–2900 m. Deforestation
is the greatest threat to the species in Guatemala. The sites
where it was collected in the 1930s have been almost entirely
deforested although new populations have been recorded
recently. Although Ramirez-Marcial et al. (2005) indicated DD for
the status of this species in Chiapas, the species’ habitat has
been severely reduced, and it is subjected to over-exploitation
for charcoal and fuelwood. Some taxonomists treat this taxon as
Q. crispipilis var. pannosifolia (C.H.Mull.) C.H.Mull.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 6, 30
19
The Red List of Oaks
Quercus subspathulata Trel.
VU A1c
Mexico (Durango, Jalisco, Nayarit, Sinaloa, Sonora,
Chihuahua)
A forest species that has suffered extensive destruction of its
habitat, it is poorly collected and represented in herbaria
collections. In many cases it is confused with other species and
requires taxonomic revision. It is rarely, if ever, found in large
populations, and its habitat range is very limited.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8, 28
Quercus tarokoensis Hayata
NT
Taiwan
Only found on the eastern part of Taiwan, usually on limestone.
Assessor: Yu-pin Cheng
Refs: 2, 17
Quercus tenuicupula (Y.C.Hsu & H.Wei Jen) C.C.Huang
CR D
China (Yunnan)
Only known from its type locality. Treated as Cyclobalanopsis
tenuicupula Y.C.Hsu & H.Wei Jen in the Flora of China. However,
the Flora of China considers it to be almost identical to
C. sichourensis, and it will most probably be amalgamated into
C. sichourensis as more collections are made.
Assessor: Zhekun Zhou et al.
Refs: 2, 5, 10, 12
Quercus thorelii Hickel & A.Camus
DD
China, Laos, Viet Nam
Although considered to be VU in China, the species has a wider
distribution in South-East Asia. Treated as Cyclobalanopsis
thorelii (Hickel & A.Camus) Hu in the Flora of China.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 10, 12
Quercus tinkhamii C.H.Mull.
DD
Mexico (Nuevo León, San Luis Potosí)
Assessor: A. Coombes et al.
Refs: 2, 7
20
Quercus tomentella Engelm.
VU B1ab(iii)+2ab(iii)
Mexico (Guadalupe Island, Baja California), USA (California)
The regeneration of the species is hampered by over-grazing in
the dry forest areas, which are restricted to the Channel Islands
of California and Guadalupe Island of Mexico. Populations on
Guadalupe Island, in particular, have declined dramatically in
recent years.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus tonduzii Seemen
DD
Costa Rica
A species of uncertain taxonomic status, found in the mountains
of central Costa Rica in Alajuela. One collection from 1896 is
cited from Volcan Poas.
Assessor: K. Nixon et al.
Refs: 1, 2
Quercus tuitensis González-Villarreal
DD
Mexico (Jalisco)
Occurs at altitudes of 980–1400 m
Assessor: A. Coombes et al.
Refs: 7, 8
Quercus uxoris McVaugh
VU A2c
Mexico (Colima, Guerrero, Jalisco, Michoacán, Oaxaca)
The extent of population declines is not documented but the
level of forest destruction has been dramatic.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 8
Quercus vulcanica Boiss. & Heldr. ex Kotschy
NT
Turkey
A species similar to Q. petraea subsp. pinnatiloba (K.Koch)
Menitsky and with affinities to Q. frainetto Ten. It occurs in southwest and central Anatolia mixed with Cedrus libani A.Rich.,
Pinus nigra Arnold, Acer hyrcanum Fisch & C.A.Mey. and
Quercus cerris L. It is under protection in a specially established
nature reserve near Isparta province, Turkey.
Assessor: Adil Güner
Refs: 2, 23
The Red List of Oaks
Quercus vicentensis Trel.
VU A2c
El Salvador, Mexico (Chiapas Oaxaca, Guerrero, Michoacán,
Jalisco)
Declines in population numbers have not been recorded, but
the species occurrence in an area of extensive forest destruction
qualifies it as Vulnerable. The species is recorded as occurring
in Guatemala in the Flora of Guatemala. However, there are no
herbarium collections of it from Guatemala and the consensus
among most experts is that it doesn’t occur there.
Assessor: Global Tree Specialist Group
Refs: 1, 2, 6, 8, 30
Quercus xalapensis Bonpl.
VU A1c
Honduras, Nicaragua, Mexico (Chiapas, Hidalgo, San Luis
Potosí, Tamaulipas, Veracruz)
In Chiapas it may be a relatively abundant tree in well preserved
montane rainforests between 1000 m and 1800 m. Its
differentiation from Q. skinneri Benth. is not yet clear. Some
Chiapas specimens have been erroneously identified as
Q. acutifolia Née.
Assessor: Global Tree Specialist Group
Refs: 1, 8, 30
Quercus xanthotricha A.Camus
DD
China (Yunnan), Laos, Viet Nam
A South-East Asian species whose distribution just reaches into
southern China, where one population is known. Treated as
Cyclobalanopsis xanthotricha (A.Camus) Y.C.Hsu & H.Wei Jen
in the Flora of China, where it is recorded to occur in mixed
mesophytic forests in mountains, 800–1300 m.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 10, 12
QUERCUS SPECIES EVALUATED AS LEAST CONCERN (LC)
Quercus acatenangensis Trel.
Mexico, Guatemala, El Salvador
Considered to be very abundant in mountains throughout
Guatemala, it is a species with very variable phenotypes, making
taxonomic identification difficult in many cases.
Assessor: J.L. Vivero & M. Szejner
Ref: 2, 34
Quercus acutissima Carruth.
Central and southern Japan, Korea, China, Indo-China,
Himalaya
Ref: 2
Quercus agrifolia Née
USA (western California), Mexico
Ref: 2
Quercus alba L.
Central and eastern USA, south-east Canada
Ref: 2
Quercus aliena Blume
Japan, Korea, China, Thailand
Ref: 2
Quercus annulata Sm.
Himalaya to north Viet Nam
Ref: 2
Quercus argentata Korth.
Indonesia (Kalimantan, Sumatra, western Java), Malaysia
(Peninsular Malaysia, Sabah, Sarawak)
Ref: 2
Quercus arizonica Sarg.
USA (Arizona, New Mexico, west Texas), north-west Mexico
Ref: 2
Quercus augustinii Skan
North-east Burma, China, Thailand, Viet Nam
Ref: 2
Quercus austrina Small
South-eastern USA
Ref: 2
21
The Red List of Oaks
Quercus berberidifolia Liebm.
California, Mexico (Baja California)
Ref: 2
Quercus bicolor Willd.
North-central and eastern USA, Canada (south Quebec,
south-eastern Ontario)
Ref: 2
Quercus brachystachys Benth.
Guatemala
Grows on both wet and dry mountains in Chiapas (Mexico) and
Guatemala and is especially associated with Pinus, sometimes
forming extensive forests at elevations between 1500 m and
2600 m. There are many herbarium specimens of this species.
Assessor: J.L. Vivero & M. Szejner
Ref: 34
Quercus brantii Lindl.
East and south-east Turkey, Syria, northern Iraq, western and
southern Iran
Ref: 2
Quercus buckleyi Nixon & Dorr
USA (Texas, Oklahoma, Kansas)
A tree previously listed as Vulnerable, being confined to scrub on
Edward’s Plateau. However, NatureServe records indicate that
it is a widespread species in Texas with occurrences in
Oklahoma and Kansas as well.
Refs: 1, 2, 3
Quercus candicans Née
Guatemala, Mexico
Typically grows on dry mountain slopes, in gullies and ravines at
1500–2000 m. This species is one of the best for firewood given
its high density and the ease with which it can be split. There are
many specimens of this species in Guatemala and it is one of the
widespread oaks in Mexico.
Assessor: J.L. Vivero & M. Szejner
Ref: 2, 8, 34
Quercus castanea Née
Mexico, Guatemala
Ref: 2
22
Quercus cerris L.
Southern and south-central Europe, Turkey, Syria, Lebanon,
Iran, Afghanistan
Ref: 2
Quercus chrysolepis Liebm.
USA (California, western Oregon, Arizona, southern Nevada,
New Mexico), Mexico
Ref: 2
Quercus coccifera L.
Mediterranean
Ref: 2
Quercus coccinea Münchh.
North-central and eastern USA
Ref: 2
Quercus conspersa Benth.
Guatemala, Mexico
Ref: 2
Quercus corrugata Hook.
Central America, Mexico
Ref: 2
Quercus cortesii Liebm.
Guatemala, Mexico
Ref: 2
Quercus crassifolia Bonpl.
Mexico, Guatemala
Ref: 2
Quercus crispipilis Trel.
Guatemala, Mexico
Ref: 2
Quercus dalechampii Ten.
East-central and south-eastern Europe
Ref: 2
Quercus dentata Thunb.
Russian Far East, Japan, Korea, Mongolia, China, Taiwan
Ref: 2
The Red List of Oaks
Quercus depressipes Trel.
Mexico (Chihuahua, Durango, Jalisco, Zacatecas), USA (Texas)
A species endemic to the central and northern Sierra Madre
Occidental and Texas. Although the species has a limited
distribution, it is locally abundant and not considered to be
threatened. In fact, it is considered to be a weed by many
foresters and farmers.
Assessor: J.R. Bacon
Refs: 1, 2, 28
Quercus ellipsoidalis E.J.Hill
North-central & east-central USA, Canada (south-west
Ontario)
Ref: 2
Quercus elliptica Née
Mexico, Guatemala, Nicaragua, El Salvador, Honduras
Ref: 2
Quercus emoryi Torr.
USA (Arizona, New Mexico, west Texas), Mexico
Ref: 2
Quercus falcata Michx.
Central and eastern USA
Ref: 2
Quercus frainetto Ten.
Southern and central Italy, Balkan Peninsula to north-western
Romania, north-western Turkey
Ref: 2
Quercus geminata Small
South-eastern USA
Ref: 2
Quercus glauca Thunb.
Himalaya to Japan, USA
Ref: 2
Quercus gravesii Sudw.
Mexico (Coahuila), USA (Texas)
A widespread species in Texas, where it is considered secure.
Status in Mexico is not known.
Assessor: Global Tree Specialist Group
Refs: 2, 4
Quercus griffithii Hook.f. & Thomson ex Miq.
India (Sikkim, Assam), Bhutan, China (south-west, Tibet),
Burma, Thailand, Laos, Viet Nam
Ref: 2
Quercus helferiana A.DC.
India (Assam), Burma, Laos, Viet Nam, Thailand, China
Ref: 2
Quercus hemisphaerica Bartram ex Willd.
USA (south-western to Texas)
Ref: 2
Quercus humboldtii Bonpl.
Colombia, Panama
Ref: 2
Quercus fusiformis Small
Mexico (Coahuila, Nuevo León, Tamaulipas) and USA
(Oklahoma, Texas)
A relatively widespread species in the USA and therefore not of
conservation concern on a global scale. Poorly known in Mexico.
Assessor: Global Tree Specialist Group
Refs: 2, 3, 4, 7
Quercus ilex L.
Mediterranean to south-central Europe
Ref: 2
Quercus gambelii Nutt.
West-central and south-central USA, northern Mexico
Ref: 2
Quercus imbricaria Michx.
Central and eastern USA
Ref: 2
Quercus garryana Douglas ex Hook.
Western USA, south-western Canada
Ref: 2
Quercus incana Bartram
South-eastern USA to Oklahoma and Texas
Ref: 2
Quercus ilicifolia Wangenh.
South-east Ontario, eastern USA
Ref: 2
23
The Red List of Oaks
Quercus infectoria G.Olivier
Greece
Ref: 2
Quercus ithaburensis Decne.
South-eastern Italy to eastern Mediterranean
Ref: 2
Quercus laeta Liebm.
Mexico
Ref: 2
Quercus laevis Walter
South-eastern USA
Ref: 2
Quercus lamellosa Sm.
Central Himalaya to southern China
Ref: 2
Quercus lanata Sm.
Nepal, Bhutan, India (Assam, Uttarakhand), Sri Lanka, Burma,
Thailand, Viet Nam, China
Ref: 2
Quercus lancifolia Schltdl. & Cham.
Guatemala, Mexico
Ref: 2
Quercus laurifolia Michx.
South-eastern USA to Texas
Ref: 2
Quercus leucotrichophora A.Camus
Northern Pakistan to northern Burma, northern Thailand,
Viet Nam
Ref: 2
Quercus libani G.Olivier
Ref: 2
Quercus lyrata Walter
Eastern and central USA
Ref: 2
24
Quercus macrocarpa Michx.
Canada (south-central, northern and south-eastern) to USA
(Alabama)
Ref: 2
Quercus margarettiae (Ashe) Small
East-central and south-eastern USA
Ref: 2
Quercus marilandica (L.) Münchh.
South-central and eastern USA
Ref: 2
Quercus michauxii Nutt.
East-central and eastern USA
Ref: 2
Quercus microphylla Née
North-eastern and south-central Mexico
Ref: 2
Quercus minima (Sarg.) Small
South-eastern USA
Ref: 2
Quercus mohriana Buckley ex Rydb.
Mexico (Coahuila), USA (New Mexico, Oklahoma, Texas)
Grows on limestone hills and slopes at altitudes of 500–2500 m.
The species is considered to be secure in the USA.
Assessor: Global Tree Specialist Group
Refs: 2, 4, 8
Quercus mongolica Fisch. ex Ledeb.
Russian Far East, Mongolia, north-east China, Korea, Japan
Ref: 2
Quercus montana Willd.
Eastern USA to Illinois
Ref: 2
Quercus muehlenbergii Engelm.
Canada (southern Ontario), eastern and central USA, northeastern Mexico
Ref: 2
The Red List of Oaks
Quercus myrtifolia Willd.
South-eastern USA
Ref: 2
Quercus petraea (Matt.) Liebl.
Europe to northern Iran
Ref: 2
Quercus nigra L.
Central and eastern USA
Ref: 2
Quercus obtusata Bonpl.
North-central and central Mexico
Ref: 2
Quercus petraea subsp. huguetiana Franco & G.López
France, northern Spain
Occurring in moist forest up to altitudes of 1800 m, the species
is abundant over a relatively wide range. It is also legally
protected in Spain.
Assessor: J.L. Vivero et al.
Refs: 1, 2
Quercus oleoides Schltdl. & Cham.
Guatemala, Mexico, Central America
Ref: 2
Quercus phellos L.
Central and eastern USA
Ref: 2
Quercus oleoides Schlecht. & Cham. subsp. sagraeana
(Nutt.) Borhidi
Cuba
This taxon, previously known as Quercus cubana A.Rich.,
occurs in the Pinar del Rio Province of Cuba, where it is
widespread.
Assessor: Rosalina Berazaín
Ref: 37
Quercus praineana Trel.
Mexico (Jalisco, Sinaloa)
Locally abundant on the western slopes of the Sierra Madre
Occidental, it appears to have increased with forestry
disturbances in the region. Thought to be a synonym of
Q. coffeicolor Trel.
Assessor: Global Tree Specialist Group
Refs: 1, 28
Quercus oxyodon Miq.
Nepal to China
Ref: 2
Quercus prinoides Willd.
Canada (southern Ontario), central and eastern USA
Ref: 2
Quercus pagoda Raf.
East-central and eastern USA
Ref: 2
Quercus prinopsis Trel.
Mexico
Ref: 2
Quercus palustris Münchh.
East-central and north-eastern USA, Canada (south Ontario)
Ref: 2
Quercus pubescens Willd.
Eastern, central and southern Europe, northern Turkey
Ref: 2
Quercus peduncularis Née
Guatemala, Mexico, Honduras
This is a widely distributed, extremely variable species which is
very common in Guatemala. It is one of the best trees in the
country for firewood, due to its high density and the ease with
which it can be split. It is not clear whether this is the same
species as Q. purulhana Trel.
Assessor: J.L. Vivero & M. Szejner
Refs: 2, 34
Quercus pumila Walter
South-eastern USA
Ref: 2
Quercus robur L.
Europe to Iran
Ref: 2
25
The Red List of Oaks
Quercus rubra L.
South-eastern Canada, east-central and eastern USA
Ref: 2
Quercus rugosa Née
USA (Texas, New Mexico, Arizona), Mexico, Guatemala,
Honduras
Ref: 2
Quercus sapotifolia Liebm.
Guatemala, Central America, Mexico
This is a very common and dominant species found in pine–oak
forests at 800–3000 m, widely distributed throughout Central
America. It is favoured for firewood, due to its slow rate of
burning and good heat production. Its bark is rich in tannins,
excellent for tanning leather. In some regions of Guatemala, a
coffee-coloured textile dye is made from the tree.
Assessor: J.L. Vivero & M. Szejner
Refs: 2, 34
Quercus segoviensis Liebm.
Guatemala, Mexico, Honduras, Nicaragua
Ref: 2
Quercus semecarpifolia Sm.
Eastern Afghanistan, northern Pakistan, eastern Nepal, India
(Sikkim, Uttarakhand), Bhutan, China (south-eastern Tibet)
Ref: 2
Quercus semiserrata Roxb.
India (Assam), Bhutan, China (Tibet, Yunnan), Burma,
Thailand, Malaysia (Peninsular Malaysia), Indonesia (Sumatra)
Ref: 2
Quercus serrata Thunb.
E. Himalaya, China (Taiwan), Korea
Ref: 2
Quercus shumardii Buckley
Canada (southern Ontario)
Ref: 2
Quercus similis Ashe
USA (south-eastern, eastern Texas)
Ref: 2
26
Quercus sinuata Walter
Mexico (Coahuila, Nuevo León, Tamaulipas), USA (Alabama,
Arkansas, Florida, Georgia, Louisiana, Mississippi, North
Carolina, Oklahoma, South Carolina, Texas)
A widely distributed species in central and south-eastern USA
and apparently secure.
Assessor: Global Tree Specialist Group
Refs: 2, 4
Quercus spinosa David
China (Fujian, Gansu, Guizhou, Hubei, Hunan, Jiangxi,
Shaanxi, Sichuan, Yunnan, Tibet), Myanmar, Taiwan, Burma
Although considered to be Vulnerable in China, the species is
considered to be of Least Concern in Taiwan where it occurs at
high altitudes. It may actually be a species complex and further
taxonomic research is required.
Assessor: Global Tree Specialist Group
Refs: 2, 5, 12, 17
Quercus stellata Wangenh.
Central and southern USA
Ref: 2
Quercus suber L.
Western and central Mediterranean
Ref: 2
Quercus texana Buckley
East-central and south-eastern USA
Ref: 2
Quercus toumeyi Sarg.
Mexico (Chihuahua), USA (Arizona, New Mexico, Texas)
Apparently secure in the USA. It is fairly abundant from centralwestern Chihuahua and adjacent Sonora northward. It has no
formal classification in Mexico. It is part of a taxonomically
confusing species complex of white oaks and needs taxonomic
revision.
Assessor: Global Tree Specialist Group
Refs: 2, 4, 28, 29
Quercus tristis Liebm.
Guatemala, Honduras, Mexico (Chiapas), Guatemala,
El Salvador
Ref: 2
The Red List of Oaks
Quercus turbinella Greene
South-western and central USA
Ref: 2
Quercus variabilis Blume
Central and southern Japan, Korea, Taiwan, central, eastern
and southern China, Viet Nam, Tibet
Ref: 2
Quercus velutina Lam.
East-central and eastern USA, Canada (south-eastern
Ontario)
Ref: 2
Quercus virginiana Mill.
South-eastern and south-central USA
Ref: 2
REFERENCES
1
Oldfield, S., Lusty, C. & MacKinven, A. (1998).
The World List of Threatened Trees. 650pp.
World Conservation Press, Cambridge, UK.
2
Govaerts, R. & Frodin, D.G. (1998). World Checklist
and Bibliography of Fagales (Betulaceae, Corylaceae,
Fagaceae and Ticodendraceae). Royal Botanic Gardens,
Kew, Richmond, UK.
3
NatureServe (2005). Data from the NatureServe central
database.
4
NatureServe (2006). NatureServe Explorer: An Online
Encyclopedia of Life. Version 4.7. NatureServe, Arlington,
Virginia. Available at http://wwwnatureserve.org/explorer
5
Bartholomew, B. (2006). E-mail correspondence with
A. Eastwood on the global status of Quercus.
6
Vivero, J.L., Szejner, M., Gordon, J. and Magin, G.
(2006). The Red List of Trees of Guatemala. Fauna & Flora
International, Cambridge, UK.
7
Coombes, A., Rodriguez-Coombes, M., Valencia-A, S.
& Zavala-C, F. (2004). Report on a meeting to assess the
status of threatened oaks in Mexico. Unpublished report,
Fauna & Flora International, Cambridge..
8
Valencia-A., S. (2004). Diversidad del género Quercus
(Fagaceae) en México. Bol. Soc. Bot. Méx. 75: 33–53.
9
Global Tree Specialist Group (2005). Globally
Threatened Trees of the Caucasus. A report on the
Caucasus regional tree Red Listing workshop (Tbilisi,
Georgia 26–28 September 2005). IUCN/SSI Global Tree
Specialist Group, Fauna & Flora International, Cambridge.
10 Flora of China Editorial Committee (Eds.) (1999).
Flora of China, Volume 4 (Cycadaceae through Fagaceae).
Science Press, Beijing and Missouri Botanical Garden
Press, St. Louis.
11 California Native Plant Society (2006). Inventory of Rare
and Endangered Plants (online edition, v6-05d). California
Native Plant Society, Sacramento, CA, USA.
12 Zhou, Z., Coombes, A. & Min, D. (2004). Report on a
meeting to assess the status of Quercus in China.
Unpublished report, Fauna & Flora International,
Cambridge.
13 Rodriguez-Acosta, M. & Coombes, A. (2000).
Estrategia de Conservación de Quercus hintonii. Reporte
Final, Fauna & Flora International. Referencia 99429,
Benemérita Universidad Autónoma de Puebla, Mexico.
14 Vázquez, M.L., Valencia-A., S. & Nixon, K.C. (2004).
Notes on red oaks (Quercus sect. Lobatae) in eastern
Mexico, with description of a new species, Quercus
hirtiifolia. Brittonia 56: 136–142.
15 Rodríguez-Coombes, M. & Coombes, A. (Undated).
Preliminary report on Quercus insignis. Mexican Oaks
Conservation Project. Unpublished report, Fauna & Flora
International, Cambridge.
16 Flora of North America Editorial Committee (Eds.)
(1993-). Flora of North America North of Mexico.
Volume 3. New York & Oxford.
27
The Red List of Oaks
17 Cheng, Y. (2006). The Conservation Status of Oaks in
Taiwan. Unpublished report sent to Antonia Eastwood.
18 Soepadmo, E., Julia, S. & Rusea, G. (2000). Fagaceae.
In: Soepadmo, E. & Saw, L.G. (eds.). Tree Flora of Sabah
& Sarawak. Vol. 3. Forest Research Institute Malaysia,
Sabah Forest Department & Sarawak Forest Department.
Pp. 1–118.
19 Coode, M.J.E., Dransfield, J., Forman, L.L., Kirkup,
D.W. & Idris, M.S. (1996). A Checklist of the Flowering
Plants & Gymnosperms of Brunei Darussalam. Ministry of
Industry and Primary Resources, Brunei Darussalam.
20 Anderson, J.A.R. (1980). A Checklist of the trees of
Sarawak. Forest Department Sarawak, Malaysia.
21 Soepadmo, E. (1972). Fagaceae. Flora Malesiana Ser. I,
7: 265–403.
22 Whitmore, T.C., Tantra, I.G.M. and Sutisna, U. (eds)
(1989). Tree Flora of Indonesia. Forest Research and
Development Centre, Bogor, Indonesia.
23 Güner, A. (2005). E-mail correspondence with Sara
Oldfield on the conservation status of Quercus vulcanica.
27 Rivas-Martínez, S., Díaz, T.E., Fernández-González, F.,
Izco, J., Loidi, J., Lousã & Penas, A. (2002). Quercus
orocantabrica Rivas Mart., Penas, T.E. Díaz & Llamas. In:
Vascular plant communities of Spain and Portugal.
Addenda to the syntaxonomical checklist of 2001. Itinera
Geobotanica 15: 5–922.
28 Bacon, J.R. (2006). Comments on the provisional list of
globally threatened oaks. E-mail correspondence with
Sara Oldfield.
29 Spellenberg, R. (2006). Comments on the provisional list
of globally threatened oaks. E-mail correspondence with
Sara Oldfield.
30 Ramírez-Marcial, N. & González-Espinosa, M. (2006).
Comments on the provisional list of globally threatened
oaks. E-mail correspondence with Sara Oldfield.
31 Zamora, N. (2006). Personal communication with
Sara Oldfield.
32 Ekim, T., Koyuncu, M., Vural, M., Duman, H., Aytac, Z.
& Adiguzel, N. (2000). Red Data Book of Turkish Plants.
Turkish Association for the Conservation of Nature,
Ankara, Turkey.
24 Cabezudo, B., Gil, Y., Navas, D., Navas P. & Pérez
Latorre A.V. (2004). Quercus alpestris Boiss. In: Bañares,
Á., Blanca, G., Güemes, J., Moreno, J.C. & Ortiz, S. eds.
(2004) Atlas y libro de la flora vascular amenazada de
España. Dirección General de Conservación de la
Naturaleza. Madrid, 1069 pp.
33 Phengklai, C. (2006). E-mail correspondence on Quercus
longistyla and Q. wangsaiensis with Antonia Eastwood.
25 Eva Economidou (Undated). Proposal for the addition of
scrub and low forest vegetation with Quercus alnifolia into
the Habitats Directive (Annex 1). Department of Botany,
University of Athens, Greece.
35 Autoridad Nacional del Ambiente (ANAM) (2000).
Primer informe de la riqueza y estado de la biodiversidad
de Panamá. ANAM, Panama City, República de Panamá.
26 Llamas, F. (2006). E-mail correspondence with Antonia
Eastwood on the conservation status of Spanish oaks.
34 Vivero, J.L. & Szejner, M. (2006). Correspondence on
Quercus sapotifolia, Quercus peduncularis and Quercus
acatenangensis with Sara Oldfield.
36 Mitre, M. (2007). E-mail correspondence with Sara
Oldfield on the taxonomic and conservation status of oaks
in Panama.
37 Leiva, A. (2006). E-mail correspondence with Sara
Oldfield.
28
The Red List of Oaks
ANNEX 1
IUCN RED LIST CATEGORIES AND CRITERIA
EXTINCT (EX)
A taxon is Extinct when there is no reasonable doubt that the last
individual has died. A taxon is presumed Extinct when exhaustive
surveys in known and/or expected habitat, at appropriate times
(diurnal, seasonal, annual), throughout its historic range have failed
to record an individual. Surveys should be over a time-frame
appropriate to the taxon’s life cycle and life form.
EXTINCT IN THE WILD (EW)
A taxon is Extinct in the Wild when it is known only to survive in
cultivation, in captivity or as a naturalized population (or populations)
well outside the past range. A taxon is presumed Extinct in the Wild
when exhaustive surveys in known and/or expected habitat, at
appropriate times (diurnal, seasonal, annual), throughout its historic
range have failed to record an individual. Surveys should be over a
time-frame appropriate to the taxon’s life cycle and life form.
CRITICALLY ENDANGERED (CR)
A taxon is Critically Endangered when the best available evidence
indicates that it meets any of the criteria A to E for Critically
Endangered (see Section V), and it is therefore considered to be
facing an extremely high risk of extinction in the wild.
DATA DEFICIENT (DD)
A taxon is Data Deficient when there is inadequate information to
make a direct, or indirect, assessment of its risk of extinction based
on its distribution and/or population status. A taxon in this category
may be well studied, and its biology well known, but appropriate
data on abundance and/or distribution are lacking. Data Deficient is
therefore not a category of threat. Listing of taxa in this category
indicates that more information is required and acknowledges the
possibility that future research will show that threatened classification
is appropriate. It is important to make positive use of whatever data
are available. In many cases great care should be exercised in
choosing between DD and a threatened status. If the range of a
taxon is suspected to be relatively circumscribed, and a considerable
period of time has elapsed since the last record of the taxon,
threatened status may well be justified.
NOT EVALUATED (NE)
A taxon is Not Evaluated when it is has not yet been evaluated
against the criteria.
THE CRITERIA FOR CRITICALLY ENDANGERED,
ENDANGERED AND VULNERABLE
ENDANGERED (EN)
A taxon is Endangered when the best available evidence indicates
that it meets any of the criteria A to E for Endangered (see Section
V), and it is therefore considered to be facing a very high risk of
extinction in the wild.
CRITICALLY ENDANGERED (CR)
A taxon is Critically Endangered when the best available evidence
indicates that it meets any of the following criteria (A to E), and it is
therefore considered to be facing an extremely high risk of extinction
in the wild:
VULNERABLE (VU)
A taxon is Vulnerable when the best available evidence indicates that
it meets any of the criteria A to E for Vulnerable (see Section V), and
it is therefore considered to be facing a high risk of extinction in
the wild.
A. Reduction in population size based on any of the following:
1. An observed, estimated, inferred or suspected population size
reduction of ≥90% over the last 10 years or three generations,
whichever is the longer, where the causes of the reduction are
clearly reversible AND understood AND ceased, based on
(and specifying) any of the following:
(a) direct observation
(b) an index of abundance appropriate to the taxon
(c) a decline in area of occupancy, extent of occurrence
and/or quality of habitat
(d) actual or potential levels of exploitation
(e) the effects of introduced taxa, hybridization, pathogens,
pollutants, competitors or parasites.
NEAR THREATENED (NT)
A taxon is Near Threatened when it has been evaluated against the
criteria but does not qualify for Critically Endangered, Endangered or
Vulnerable now, but is close to qualifying for or is likely to qualify for
a threatened category in the near future.
LEAST CONCERN (LC)
A taxon is Least Concern when it has been evaluated against the
criteria and does not qualify for Critically Endangered, Endangered,
Vulnerable or Near Threatened. Widespread and abundant taxa are
included in this category.
2 An observed, estimated, inferred or suspected population size
reduction of ≥80% over the last 10 years or three generations,
whichever is the longer, where the reduction or its causes may
29
The Red List of Oaks
not have ceased OR may not be understood OR may not be
reversible, based on (and specifying) any of (a) to (e) under A1.
3. A population size reduction of ≥80%, projected or suspected
to be met within the next 10 years or three generations,
whichever is the longer (up to a maximum of 100 years), based
on (and specifying) any of (b) to (e) under A1.
4. An observed, estimated, inferred, projected or suspected
population size reduction of ≥80% over any 10 year or three
generation period, whichever is longer (up to a maximum of
100 years in the future), where the time period must include
both the past and the future, and where the reduction or its
causes may not have ceased OR may not be understood OR
may not be reversible, based on (and specifying) any of (a) to
(e) under A1.
B. Geographic range in the form of either B1 (extent of occurrence)
OR B2 (area of occupancy) OR both:
1. Extent of occurrence estimated to be less than 100 km2, and
estimates indicating at least two of a-c:
a. Severely fragmented or known to exist at only a single
location.
b. Continuing decline, observed, inferred or projected, in
any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) area, extent and/or quality of habitat
(iv) number of locations or subpopulations
(v) number of mature individuals.
c. Extreme fluctuations in any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) number of locations or subpopulations
(iv) number of mature individuals.
2. Area of occupancy estimated to be less than 10 km2, and
estimates indicating at least two of a-c:
a. Severely fragmented or known to exist at only a single
location.
b. Continuing decline, observed, inferred or projected, in
any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) area, extent and/or quality of habitat
(iv) number of locations or subpopulations
(v) number of mature individuals.
30
c. Extreme fluctuations in any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) number of locations or subpopulations
(iv) number of mature individuals.
C. Population size estimated to number fewer than 250 mature
individuals and either:
1. An estimated continuing decline of at least 25% within three
years or one generation, whichever is longer, (up to a
maximum of 100 years in the future) OR
2. A continuing decline, observed, projected, or inferred, in
numbers of mature individuals AND at least one of the
following (a-b):
(a) Population structure in the form of one of the following:
(i) no subpopulation estimated to contain more than
50 mature individuals, OR
(ii) at least 90% of mature individuals in one
subpopulation.
(b) Extreme fluctuations in number of mature individuals.
D. Population size estimated to number fewer than 50 mature
individuals.
E. Quantitative analysis showing the probability of extinction in the
wild is at least 50% within 10 years or three generations,
whichever is the longer (up to a maximum of 100 years).
ENDANGERED (EN)
A taxon is Endangered when the best available evidence indicates
that it meets any of the following criteria (A to E), and it is therefore
considered to be facing a very high risk of extinction in the wild:
A. Reduction in population size based on any of the following:
1. An observed, estimated, inferred or suspected population size
reduction of ≥70% over the last 10 years or three generations,
whichever is the longer, where the causes of the reduction are
clearly reversible AND understood AND ceased, based on
(and specifying) any of the following:
(a) direct observation
(b) an index of abundance appropriate to the taxon
(c) a decline in area of occupancy, extent of occurrence
and/or quality of habitat
(d) actual or potential levels of exploitation
(e) the effects of introduced taxa, hybridization, pathogens,
pollutants, competitors or parasites.
The Red List of Oaks
2. An observed, estimated, inferred or suspected population size
reduction of ≥50% over the last 10 years or three generations,
whichever is the longer, where the reduction or its causes may
not have ceased OR may not be understood OR may not be
reversible, based on (and specifying) any of (a) to (e) under A1.
3. A population size reduction of ≥50%, projected or suspected
to be met within the next 10 years or three generations,
whichever is the longer (up to a maximum of 100 years), based
on (and specifying) any of (b) to (e) under A1.
4. An observed, estimated, inferred, projected or suspected
population size reduction of ≥50% over any 10 year or three
generation period, whichever is longer (up to a maximum of
100 years in the future), where the time period must include
both the past and the future, AND where the reduction or its
causes may not have ceased OR may not be understood OR
may not be reversible, based on (and specifying) any of (a) to
(e) under A1.
B. Geographic range in the form of either B1 (extent of occurrence)
OR B2 (area of occupancy) OR both:
1. Extent of occurrence estimated to be less than 5000 km2, and
estimates indicating at least two of a-c:
a. Severely fragmented or known to exist at no more than
five locations.
b. Continuing decline, observed, inferred or projected, in
any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) area, extent and/or quality of habitat
(iv) number of locations or subpopulations
(v) number of mature individuals.
c. Extreme fluctuations in any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) number of locations or subpopulations
(iv) number of mature individuals.
2. Area of occupancy estimated to be less than 500 km2, and
estimates indicating at least two of a-c:
a. Severely fragmented or known to exist at no more than
five locations.
b. Continuing decline, observed, inferred or projected, in any
of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) area, extent and/or quality of habitat
(iv) number of locations or subpopulations
(v) number of mature individuals.
c. Extreme fluctuations in any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) number of locations or subpopulations
(iv) number of mature individuals.
C. Population size estimated to number fewer than 2500 mature
individuals and either:
1. An estimated continuing decline of at least 20% within five
years or two generations, whichever is longer, (up to a
maximum of 100 years in the future) OR
2. A continuing decline, observed, projected, or inferred, in
numbers of mature individuals AND at least one of the
following (a-b):
(a) Population structure in the form of one of the following:
(i) no subpopulation estimated to contain more than
250 mature individuals, OR
(ii) at least 95% of mature individuals in one
subpopulation.
(b) Extreme fluctuations in number of mature individuals.
D. Population size estimated to number fewer than 250 mature
individuals.
E. Quantitative analysis showing the probability of extinction in the
wild is at least 20% within 20 years or five generations, whichever
is the longer (up to a maximum of 100 years).
VULNERABLE (VU)
A taxon is Vulnerable when the best available evidence indicates that
it meets any of the following criteria (A to E), and it is therefore
considered to be facing a high risk of extinction in the wild:
A. Reduction in population size based on any of the following:
1. An observed, estimated, inferred or suspected population size
reduction of ≥50% over the last 10 years or three generations,
whichever is the longer, where the causes of the reduction are:
clearly reversible AND understood AND ceased, based on
(and specifying) any of the following:
(a) direct observation
(b) an index of abundance appropriate to the taxon
(c) a decline in area of occupancy, extent of occurrence
and/or quality of habitat
31
The Red List of Oaks
(d) actual or potential levels of exploitation
(e) the effects of introduced taxa, hybridization, pathogens,
pollutants, competitors or parasites.
2. An observed, estimated, inferred or suspected population size
reduction of ≥30% over the last 10 years or three generations,
whichever is the longer, where the reduction or its causes may
not have ceased OR may not be understood OR may not be
reversible, based on (and specifying) any of (a) to (e) under A1.
3. A population size reduction of ≥30%, projected or suspected
to be met within the next 10 years or three generations,
whichever is the longer (up to a maximum of 100 years), based
on (and specifying) any of (b) to (e) under A1.
4. An observed, estimated, inferred, projected or suspected
population size reduction of ≥30% over any 10 year or three
generation period, whichever is longer (up to a maximum of
100 years in the future), where the time period must include
both the past and the future, AND where the reduction or its
causes may not have ceased OR may not be understood OR
may not be reversible, based on (and specifying) any of (a) to
(e) under A1.
B. Geographic range in the form of either B1 (extent of occurrence)
OR B2 (area of occupancy) OR both:
1. Extent of occurrence estimated to be less than 20,000 km2,
and estimates indicating at least two of a-c:
a. Severely fragmented or known to exist at no more than
10 locations.
b. Continuing decline, observed, inferred or projected, in any
of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) area, extent and/or quality of habitat
(iv) number of locations or subpopulations
(v) number of mature individuals.
c. Extreme fluctuations in any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) number of locations or subpopulations
(iv) number of mature individuals.
2. Area of occupancy estimated to be less than 2000 km2, and
estimates indicating at least two of a-c:
a. Severely fragmented or known to exist at no more than
10 locations.
32
b. Continuing decline, observed, inferred or projected, in any
of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) area, extent and/or quality of habitat
(iv) number of locations or subpopulations
(v) number of mature individuals.
c. Extreme fluctuations in any of the following:
(i) extent of occurrence
(ii) area of occupancy
(iii) number of locations or subpopulations
(iv) number of mature individuals.
C. Population size estimated to number fewer than 10,000 mature
individuals and either:
1. An estimated continuing decline of at least 10% within 10
years or three generations, whichever is longer, (up to a
maximum of 100 years in the future) OR
2. A continuing decline, observed, projected, or inferred, in
numbers of mature individuals AND at least one of the
following (a-b):
(a) Population structure in the form of one of the following:
(i) no subpopulation estimated to contain more than
1000 mature individuals, OR
(ii) all mature individuals are in one subpopulation.
(b) Extreme fluctuations in number of mature individuals.
D. Population very small or restricted in the form of either of the
following:
1. Population size estimated to number fewer than 1000 mature
individuals.
2. Population with a very restricted area of occupancy (typically
less than 20 km2) or number of locations (typically five or fewer)
such that it is prone to the effects of human activities or
stochastic events within a very short time period in an
uncertain future, and is thus capable of becoming Critically
Endangered or even Extinct in a very short time period.
E. Quantitative analysis showing the probability of extinction in the
wild is at least 10% within 100 years.
Source: IUCN (2001)
The Red List of
Oaks
For further information please contact:
Fauna & Flora International
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Station Road, Cambridge,
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Tel: + 44 (0) 1223 571000
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Surrey, TW9 3BW
United Kingdom
Tel: +44 (0)20 8332 5953
Fax: +44 (0)20 8332 5956
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