Poaceae
Arberella

Arberella dressleri Soderstr. & C.E.Calderón

First published in Brittonia 31: 433 (1979)
This species is accepted
The native range of this species is Panama. It is a herbaceous bamboo and grows primarily in the wet tropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Culms erect; 30-35 cm long; 3-6 -noded. Culm-internodes solid. Culm-nodes constricted. Lateral branches lacking. Leaves cauline. Leaf-sheaths outer margin hairy. Ligule a ciliolate membrane; 0.8 mm long. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath; petiole 0.1-0.2 cm long; petiole pubescent. Leaf-blades lanceolate; 8-14 cm long; 15-30 mm wide. Leaf-blade surface glabrous. Leaf-blade margins serrulate; ciliate. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Monoecious; with male and female spikelets in the same inflorescence (or some all male). Inflorescence a panicle; comprising 1 fertile spikelets (and 5-20 male); terminal and axillary. Axillary inflorescences present throughout the plant. Panicle open; linear; 4-8 cm long; bearing few spikelets. Sexes segregated; on unisexual branches; with male below. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled; 2 in a cluster. Pedicels clavate (female), or linear (male); scaberulous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 13-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent; truncate. Male spikelets distinct from female; 1 flowered; linear, or lanceolate; 3.2-6.4 mm long. Male spikelet glumes absent. Male spikelet lemma 3 -veined; awned; with 1 mm long awn.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 13-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent; truncate.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume elliptic; 13-22 mm long; 1 length of upper glume; membranous; pallid; without keels; 9-11 -veined. Lower glume lateral veins with cross-veins. Lower glume apex caudate. Upper glume elliptic; 13-22 mm long; 1.5 length of adjacent fertile lemma; membranous; pallid; without keels; 8-9 -veined. Upper glume lateral veins with cross-veins. Upper glume apex caudate.
Morphology Reproductive morphology Flowers Florets
Fertile florets female. Fertile lemma lanceolate, or ovate; dorsally compressed; 8.5-10.3 mm long; indurate; pallid and mid-green; mottled with last colour; shiny; without keel; 5 -veined. Lemma surface pubescent; hairy above and below. Lemma margins pubescent; hairy below. Lemma apex apiculate. Palea lanceolate; indurate; 9-10 -veined. Palea surface pubescent; hairy on back; hairy above.
Morphology Reproductive morphology Flowers
Lodicules 3; 1.1-1.2 mm long; membranous. Anthers 3; 1.9-2 mm long. Stigmas 2.
sex Male
Male spikelets distinct from female; 1 flowered; linear, or lanceolate; 3.2-6.4 mm long. Male spikelet glumes absent. Male spikelet lemma 3 -veined; awned; with 1 mm long awn.
Distribution
South America: Mesoamericana.
Reference
Olyreae. Soderstrom.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0