Belg. Journ. Bot. 138 (1) : 11-23 (2005) © Royal Botanical Society of Belgium CHECKLIST OF THE MIMOSOIDEAE (LEGUMINOSAE) OF EQUATORIAL GUINEA (ANNOBÓN, BIOKO, RÍO MUNI) M. ESTRELLA*, F. CABEZAS, C. AEDO and M. VELAYOS Real Jardín Botánico, Pl. Murillo 2, 28014-Madrid, Spain (*Author for correspondence ; email : mestrella@ma-rjb.csic.es) Received 5 April 2004 ; accepted 19 October 2004. ————————————————————————————————————————— ABSTRACT. — A checklist of the Mimosoideae (Leguminosae) of Equatorial Guinea comprising 21 genera and 40 taxa is presented. Two species are known from Annobón, 18 from Bioko and 37 from Río Muni. The best represented genera are Albizia and Newtonia with five species each. In addition, bibliographic references for Mimosoideae (Leguminosae) from Equatorial Guinea have been gathered and checked. Fourteen taxa are recorded for the first time from the country. A statistical summary is presented at the end of the checklist. KEY WORDS. — Annobón, Bioko, checklist, Equatorial Guinea, Mimosoideae (Leguminosae), Río Muni. ————————————————————————————————————————— INTRODUCTION The Leguminosae form the third largest plant family of the world, comprising about 650 genera and ca. 18000 species. The subfamily Mimosoideae, with ca. 3000 species in 50-60 genera, are distributed worldwide and are abundant in tropical, subtropical and warm-temperate areas (POLHILL & RAVEN 1981). In tropical Africa Acacia, Albizia, Entada and Newtonia are the richest in number of species (LEBRUN & STORK 1992). Important works on Mimosoideae of West tropical Africa include those of OLIVER (1871) and KEAY (1958). The most recent work on Mimosoideae from the region is VILLIERS (1989). A complete account of the Mimosoideae (Leguminosae) of Equatorial Guinea has never been published. Although they were included in the general vascular plant catalogue of GUINEA (1946), this author added plants that he presumed to be present in Equatorial Guinea. Over the last 20 years the Real Jardín Botánico has carried out intensive fieldwork in both Bioko and Río Muni. These new collections and the available historical specimens have permitted the preparation of checklists of several groups: Pteridophytes (HERRERO et al. 2001, VELAYOS et al. 2001), Piperaceae (FERO et al. 2003), Melastomataceae (PARMENTIER & GEERINCK 2003) and Cyperaceae (CABEZAS et al. 2004). This work has been complemented by studies on the inselbergs vegetation carried out by botanists from the Université Libre de Bruxelles (LEJOLY & LISOWSKI 1999, PARMENTIER 2001, 2003, PARMENTIER et al. 2001). The aim of this paper is to update the catalogue of Mimosoideae for the whole of Equatorial Guinea including both bibliographic records and herbarium material. This checklist is a new step towards a modern Flora of Equatorial Guinea. MATERIAL AND METHODS The checklist is primarily based on herbarium specimens. We have studied more than 140 specimens from BM, BRLU, K, LISU and MA, including both the historic collections made during British expeditions by 12 BELGIAN JOURNAL OF BOTANY 138 Mann, Tessmann and Vogel, and modern collections obtained by both Belgian and Spanish expeditions. Bibliographic references for the legumes of Equatorial Guinea have also been checked (AEDO et al. 1999). Two species are included, that are based only on literature records since their distribution areas make their presence in Equatorial Guinea probable. They are quoted with the number between brackets. Eight introduced species are presented in the checklist; they are marked with an asterisk (*) before the accepted name. The locality names used in this checklist have been brought up-to-date following VELAYOS et al. (2001 : 147-149), in which a gazeteer including geographical coordinates can be found. The checklist is alphabetically ordered by genera and species. Generic circumscription is in accordance with LOCK (1989), although recent molecular data suggest that Acacia should be divided into three or four genera (MASLIN et al. 2003). When available we used monographs or regional works as those of VILLIERS (1984, 1990). Under each accepted name a list of synonyms used in the relevant literature is given. Specimens are ordered alphabetically by the different regions and provinces: Annobón, Bioko (provinces of Bioko Norte and Bioko Sur) and Río Muni (provinces of Centro Sur, Kie Ntem, Litoral and Wele Nzas). Previous bibliographical records of each taxon are grouped under the already mentioned three regions. When a taxon was reported under a different name (synonym) it is indicated as follows: GUINEA 1946 : 289, sub Pithecellobium saman. In the case of a misidentification the author’s name is included following the cited species (LOCK 1989 : 86, sub Inga rodrigueziana Pittier). Doubtful records are placed at the end of the checklist. THE CHECKLIST South Africa, Tanzania, Togo, Uganda and Zimbabwe, and reported as planted or an escape from cultivation (LOCK 1989 : 67, ROSS 1979 : 102). 2. — Acacia kamerunensis Gand. Acacia pennata auct. Bioko Norte : Monte Balea, Guinea 525 (MA). Bioko Sur : Musola, finca Puente, Guinea 1814 (MA), 1816 (MA). Previously reported from Río Muni (GUINEA 1946 : 149, sub Acacia pennata). 3. — Acacia pentagona (Schumach. & Thonn.) Hook. f. Bioko Norte : Malabo – pico Basilé, km 7-8, Carvalho 3478 (MA), 3957 (MA). Centro Sur : Niefang-Bindeng, pista hacia el río Uoro, Pérez Viso 2408 (MA). Litoral : Bata-Monson-Dibolo, Mbubuin, Carvalho 4881 (MA). Previously reported from Río Muni (BRENAN & EXELL 1957 : 134). ADENANTHERA L. 4. — (*)Adenanthera pavonina L. Bioko Sur : Luba-Veiga y Avendaño, Fernández Casas 12037 (MA). Previously reported from Bioko (GUINEA 1946 : 291, EXELL 1973 : 356) and Río Muni (GUINEA 1946 : 291). Originally a species from tropical Asia and nowadays naturalised in many other areas. In Africa this species has been reported from neighbouring Cameroon, Gabon and São Tomé (LOCK 1989 : 86, VILLIERS 1989 : 61). ACACIA Mill. ADENOPODIA C. Presl 1. — (*)Acacia farnesiana (L.) Willd. 5. — Adenopodia scelerata (A. Chev.) Brenan Centro Sur : Env. de Niefang, dans un village, cultivé, Lisowski M-770 (BRLU). Previously reported from Bioko (GUINEA 1946 : 290 ; EXELL 1973a : 355) and from Río Muni (GUINEA 1946 : 290). This species is native to America but it has been introduced in many African countries : Ethiopia, Ghana, Libya, Mozambique, Rhodesia, Litoral : Bata-Niefang, km 35, Adjape Bibak y Nco, Carvalho 5909 (MA). Not previously reported from Equatorial Guinea. This species is distributed in West and Central Africa, and reported from Angola, Cameroon, Gabon, Ghana, Ivory Coast, Liberia, Nigeria, Chad and Zaire (BRENAN 1985 : 76-77, LOCK 1989 : 87). MIMOSOIDEAE OF EQUATORIAL GUINEA ALBIZIA Durazz. 6. — Albizia adianthifolia (Schumach.) W. Wight Albizia fastigiata Oliv. Albizia intermedia De Wild. & T. Durand 13 Originally from Asia, this species has been introduced in almost all tropical regions (VILLIERS 1989 : 156, LOCK 1989 : 82). 10. — Albizia zygia (DC.) J.F. Macbr. Albizia brownei (Walp.) Oliv. Centro Sur : Bata-Mongo, zona forestal de ALOSA, km 57-58, Carvalho 5421 (MA) ; P.N. Monte Alén, près du village de Monte Alén, Senterre, Obiang & Esono 2906 (BRLU). Wele Nzas: dalle rocheuse à 3 km au S de Asoc, Lejoly 99/301T2 (BRLU) ; Nkolentagan, Tessmann 242a (K). Previously reported from Río Muni (GUINEA 1946 : 141 and 290, sub Albizia fastigiata, PARMENTIER et al. 2001 : 361) and from Equatorial Guinea (BRENAN 1953 : 520, sub A. intermedia, KEAY 1958 : 503, sub A. intermedia). Bioko Norte : Malabo-Baney, estrada km 56, Carvalho 3782 (MA), Malabo-Punta Hermosa, estrada km 7-8, Carvalho 4248 (MA). Centro Sur : P.N. Monte Alén, entre 0 et 1 km à l’ouest du village de Ale, Lejoly 93/351 (BRLU). Wele Nzas : Nkolentagan, Tessmann 175, 845 (K). Previously reported from Bioko (EXELL 1973a : 356) and Río Muni (GUINEA 1946 : 141, 144, sub Albizia brownei). 7. — Albizia ferruginea (Guill. & Perr.) Benth. Centro Sur: P. N. Monte Alén, 3,7 km au W de Aconangui, Senterre & Obiang 3865 (BRLU). Not previously reported from Equatorial Guinea. This species has been reported from neighbouring Cameroon and Gabon (VILLIERS 1989 : 36, LOCK 1989 : 87). Centro Sur : P.N. Monte Alén, 1 km au E de la Cabaña de Mosumo, Senterre & Obiang 4098 (BRLU). Not previously reported from Equatorial Guinea. Common in tropical Africa and reported from neighbouring Cameroon and Gabon (LOCK 1989 : 81). 8. — Albizia gummifera (J.F. Gmel.) C.A. Sm. Centro Sur : Evinayong, Guinea 326 (MA), 502-203 (MA). Not previously reported from Equatorial Guinea. Common in tropical Africa and reported from neighbouring Cameroon (LOCK 1989 : 82). 9. — (*)Albizia lebbeck (L.) Benth. Bioko : Mann 416 (K). Bioko Norte : Malabo, junto al Ministerio de Agricultura, Carvalho 3846 (MA). Bioko Sur : Luba-Malabo, km 2 do cruzamento, Carvalho 2672 (MA) ; cerca de Luba, dirección a Batete, Fernández Casas 10270 & al. (BM, K, MA) ; Luba-Veiga y Avendaño, km 2, Fernández Casas 12010 (MA). Previously reported from Bioko (GUINEA 1946 : 290, CUFODONTIS 1954 : 185, KEAY 1958 : 502, EXELL 1973a : 356, FERNÁNDEZ CASAS 1992 : 59-60). AUBREVILLEA Pellegr. 11. — Aubrevillea platycarpa Pellegr. CALLIANDRA Benth. 12. — (*)Calliandra surinamensis Benth. Litoral : Eyan Bot, Bata–Cogo, km 12, Pérez Viso 3562 (MA). Not previously reported from Equatorial Guinea. This species is originally from America, it has been introduced in Africa and reported from neighbouring Gabon (VILLIERS 1989 : 171). CALPOCALYX Harms 13. — Calpocalyx dinklagei Harms Centro Sur : P.N. Monte Alén, Lejoly 95/188 (BRLU). Litoral : Bata-Pembe, km 28-29, Carvalho 5384 (MA) ; Bata-Niefang, km 35, zona de Comaya, Carvalho 5682 (MA). Wele Nzas : Eviam, carretera forestal de Bata a Niefang, Pérez Viso 2584 (MA) ; Nkoletagan, Tessmann 12, 646 (K). Previously reported from Río Muni (GUINEA 1946 : 144, 291, PARMENTIER et al. 2001 : 364) and from Equatorial Guinea (KEAY 1958 : 488). 14 BELGIAN JOURNAL OF BOTANY 138 14. — Calpocalyx heitzii Pellegr. Litoral : Bicubini, Wilks 3564 (BRLU). Río Muni : Eman-Ngos, Obama 837 (BRLU). Not previously reported from Equatorial Guinea. This species has been reported from Cameroon and Gabon (LOCK 1989 : 88). 15. — Calpocalyx klainei Pierre ex Harms Litoral : Bata-Senge, estrada km 23-24, Carvalho 5687 (MA) ; Bata-Senge, estrada km 27, Carvalho 6128 (MA). Previously reported from Río Muni (GUINEA 1946 : 291). 16. — Calpocalyx ngouniensis Pellegr. Litoral : Bata-Bicomo, km 7-8 de Nkoantoma a Ayelon, Carvalho 4775 (MA). Not previously reported from Equatorial Guinea. This species has been reported in neighbouring Cameroon and Gabon (VILLIERS 1984 : 308). CATHORMION (Benth.) Hassk. 17. — Cathormion altissimum (Hook. f.) Hutch. & Dandy Pithecellobium altissimum (Hook. f.) Oliv. Bioko Norte : Bahía Venus, Guinea 299 (MA). Unknown province : Guinea 1166bis (MA). Previously reported from Río Muni (GUINEA, 1946 : 141, sub Pithecellobium altissimum). CYLICODISCUS Harms This species has been reported from Río Muni (GUINEA 1946 : 291, sub Dichrostachys nutans). We have not found any herbarium material of D. cinerea from Equatorial Guinea in BM, K, LISU and MA. This pantropical species has been reported from many countries in Africa, including Cameroon and Gabon (VILLIERS 2002a : 210-211, LOCK 1989 : 89). The distribution range of this species suggests it may occur in Equatorial Guinea. ENTADA Adans. 20. — Entada gigas (L.) Fawc. & Rendle Entada scandens Benth. Bioko : Mann 230 (K). Centro Sur : P.N. Monte Alén, senda al lago Atok, Pérez Viso 1318 (MA). Litoral : Bata-Mbini, km 23-24, Carvalho 5302 (MA) ; Mbonde, Guinea 775 (MA) ; Utonde, Guinea 776 (MA) ; Ecuco, Guinea 777 (MA) ; Miwala, a 5 km de Kogo, Pérez Viso 3956 (MA). Wele Nzas: cerro cúpula de Kukumankok, Guinea 11-374 (MA). Previously reported from Bioko (OLIVER 1871 : 325, sub Entada scandens ; GUINEA 1946 : 291, sub E. scandens ; CUFODONTIS 1955 : 210 ; KEAY 1958 : 491 ; EXELL 1973a : 358), Río Muni (GUINEA 1946 : 154, 178, 179, 291 sub E. scandens, GUINEA 1946 : 184k, PARMENTIER et al. 2001 : 353, 360) and from Equatorial Guinea (CUFODONTIS 1955 : 210). 21. — Entada mannii (Oliv.) Tisser Piptadenia mannii Oliv. Centro Sur : Niefang, explotación forestal de Matroguisa, Pérez Viso 2345 (MA). Wele Nzas : pista forestal entre Eviam y Aconibe, Pérez Viso 2084 (MA) ; Nkolentagan, Tessmann 209, 1077 (K). Previously reported from Río Muni (GUINEA 1946 : 141, 144, 291, PARMENTIER et al. 2001 : 342). Bioko : Mann 20, 414 (K). Bioko Norte : Malabo, río Cupapa, Carvalho 2253 (MA) ; MalaboBaney, km 8-9, Carvalho 3521 (MA) ; MalaboPunta Hermosa, km 14-15, Carvalho 3804 (MA) ; Malabo-Cupapa, km 19-20, Carvalho 4019 (MA). Previously reported from Bioko (OLIVER 1871 : 329, sub Piptadenia mannii, MILDBRAED 1922 : 184, sub P. mannii, GUINEA 1946 : 291, sub P. mannii, KEAY 1958 : 491, sub P. mannii, EXELL 1973a : 358). DICHROSTACHYS (DC.) Wight & Arn. 22. — Entada rheedii Spreng. (19). — Dichrostachys cinerea (L.) Wight & Arn. Dichrostachys nutans Benth. Bioko Norte : Malabo-Luba, praia Manuel Rodrigues, Carvalho 2344 (MA) ; Malabo-Punta Hermosa, estrada km 6-7, Carvalho 3939 (MA). 18. — Cylicodiscus gabunensis Harms MIMOSOIDEAE OF EQUATORIAL GUINEA 15 Bioko Sur : Malabo-Riaba, cerca de Baó Grande, Fernández Casas 11680 (MA). Wele Nzas : Nsuameyang, Lope del Val s.n. (MA-705840, MA705841, MA-705842, MA-705843, MA-705844). Río Muni : Tessmann 582 (K). Previously reported from Equatorial Guinea by LOCK (1989 : 92). This record is most probably based on Tessmann 582 (K). 290-291, sub L. glauca, KEAY 1958 : 495, sub L. glauca, EXELL 1973a : 359) and Río Muni (GUINEA 1946 : 290-291, sub L. glauca). Originally from America, this species has been introduced all over the tropical areas. Previously reported from many African countries, also from neighbouring São Tomé & Príncipe (LOCK 1989 : 93, HUGHES 1998 : 114-117). FILLAEOPSIS Harms 25.a. — (*)Leucaena leucocephala (Lam.) De Wit subsp. leucocephala (23). — Fillaeopsis discophora Harms This species has been reported from Río Muni (GUINEA 1946 : 144, 291). We have not found any herbarium material of F. discophora from Equatorial Guinea in BM, K, LISU and MA. This species occurs in West and Central Africa and has been reported from Angola, Cameroon, Gabon, Nigeria and Zaire (VILLIERS 1989 : 41, LOCK 1989 : 93). The distribution range of the species suggests it may occur in Equatorial Guinea. INGA Mill. 24. — (*)Inga edulis Mart. Bioko : Fernández Casas & Carvalho 11416 (MA). Bioko Norte : Malabo-Rebola, estrada km 8-9, Carvalho 3618 (MA) ; subida al pico Basilé, Fernández Casas 10177 & al. (MA) ; Malabo, Swarbrick 2930 (K). Bioko Sur : cerca de Basacato del Oeste, Fernández Casas & al. 10056 (MA). Centro Sur: Nsung, entre Monte Alén y Evinayong, Pérez Viso 1678 (MA). Previously reported from Equatorial Guinea by LOCK (1989 : 86, sub Inga rodrigueziana Pittier). This record is most probably based on Swarbrick 2930 (K), since it is the only specimen at Kew from Equatorial Guinea. Dr. Pennington kindly confirmed the reidentification as I. edulis. This species is originally from South America, it has been introduced in many tropical regions and used as shade tree in coffee cultures (PENNINGTON 1997 : 744). Bioko : Vogel 79 (K). Bioko Norte : Malabo, finca das Carboneras, Carvalho 2020 (MA) ; servicio agronómico de Malabo, Guinea 123 (MA), 628 (MA). Bioko Sur : Luba-Veiga y Avendaño, Fernández Casas 12012 (MA). Litoral : Ayamiken, Río Campo, km 38 de la carretera que sale a la derecha de Adjakom, Pérez Viso 2785 (MA). 25.b. — (*)Leucaena leucocephala subsp. glabrata (Rose) Zárate Bioko Norte : Malabo-Sampaca, estrada km 4-5, Carvalho 2566 (MA) ; cerca de Basilé, Fernández Casas 10109 & al. (BM, K, MA) ; Malabo, Lope del Val s.n. (MA-706055). Bioko Sur : cerca de Riaba, Fernández Casas 11684 (MA). Not previously reported from Equatorial Guinea. MIMOSA L. 26. — Mimosa pudica L. Bioko Norte : Malabo, finca das Carboneras, Carvalho 2816 (MA) ; servicio agronómico de Malabo, Guinea 611 (MA) ; pico Basilé, Lope de Val s.n. (MA-500362, MA-696929, MA-706184). Centro Sur : Niefang, explotación forestal de Matroguisa, Pérez Viso 2294 (MA) ; carretera forestal Bata-Niefang, km 40, Pérez Viso 2717 (MA). Litoral : Bata, Davies 215 (K); Miboman, a 22 km de Bata, Castroviejo 9160 (MA). Previously reported from Bioko (GUINEA 1946 : 71, 290, EXELL 1973a : 359). LEUCAENA Benth. NEWTONIA Baill. 25. — (*)Leucaena leucocephala (Lam.) De Wit Leucaena glauca (Willd.) Benth. Previously reported from Bioko (OLIVER 1871 : 336, sub Leucaena glauca, GUINEA 1946 : 27. — Newtonia duparquetiana (Baill.) Keay Centro Sur : SE du P.N. Monte Alén, transect Ecofac de Nkumékié, Senterre & Obiang 3641 (BRLU). Litoral : Etembue (Réserve de Ndote), 16 BELGIAN JOURNAL OF BOTANY 138 Eneme & Lejoly 43 (BRLU) ; Ndote Sud, Lisowski M-569 (BRLU). Not previously reported from Equatorial Guinea, this species has been reported from Cameroon and Gabon (VILLIERS 1990 : 126). 28. — Newtonia glandulifera (Pellegr.) G.C.C. Gilbert & Boutique Centro Sur : P.N. Monte Alén, transect de Monte Chocolate, Lejoly 95T/L3768 (BRLU). Not previously reported from Equatorial Guinea. 29. — Newtonia grandifolia Villiers Centro Sur : SO du P.N. Monte Alén, 200 m au S du transect Ecofac de Mosumo, Senterre & Ngomo 846 (BRLU). Wele Nzas : P.N. Nsork, Obamicu, Nguema, Esono & Lejoly 244 (BRLU). Not previously reported from Equatorial Guinea. This species has been reported from Cameroon and Gabon (VILLIERS 1990 : 129). 30. — Newtonia griffoniana (Baill.) Baker f. Newtonia zenkeri Harms Newtonia klainei Pierre ex Harms Bioko Norte : Malabo-Luba, estrada km 1920, Carvalho 4198 (MA) ; Malabo-Batoicopo, estrada km 19-20, Carvalho 4456 (MA). Centro Sur : P.N. Monte Alén, Pérez Viso 86 (MA) ; SO du P.N. Monte Alén, 200 m au S du transect Ecofac de Mosumo, Senterre & Ngomo 672 (BRLU). Unknown province : Lope del Val s.n. (MA-705395). Previously reported from Río Muni (GUINEA 1946 : 144, sub Newtonia zenkeri, 291, sub N. klainei). 31. — Newtonia leucocarpa (Harms) G.C.C. Gilbert & Boutique Centro Sur : SE du P.N. Monte Alén, au N du rio Laña, près de la Cabaña Ecofac de Misergue, Senterre & Obiang 3170 (BRLU). Not previously reported from Equatorial Guinea. This species has been reported from the neighbouring Cameroon and Gabon (VILLIERS 1990 : 132). PARKIA R. Br. 32. — Parkia bicolor A. Chev. Parkia klainei Pierre ex De Wild. Parkia zenkeri Harms Litoral : Bata-Pembe, alrededores de Ebenvang, Carvalho 5478 (MA). Previously reported from Río Muni (GUINEA 1946 : 144, sub Parkia zenkeri, 291, sub Parkia klainei). 33. — (*)Parkia biglobosa (Jacq.) R. Br. ex G. Don Parkia oliveri J. F. Macbr. Parkia africana R. Br. Parkia clappertonia Keay Annobón : Ilha de Anno Bon, terras cultivadas, Newton s.n. (LISU-165621). This species has been reported from Annobón (SOBRINHO 1953 : 183, sub Parkia oliveri, EXELL 1956 : 18, sub P. oliveri, EXELL 1973a : 359, sub P. oliveri), Bioko (GUINEA 1946 : 291, sub P. africana, EXELL 1973a : 359, sub P. clappertonia) and Río Muni (GUINEA 1946 : 291, sub P. africana). We have identified the previously mentioned sterile specimen as P. biglobosa because it has 1112 pairs of pinnae, 13-38 subopposite leaflets pairs (7-15 ⫻ 1.5-3 mm), with a straight main nerve, and a single, orbicular gland at petiole base as well as greyish pubescence along the main rachis (HOPKINS 1983 : 141-148, HALL et al. 1997 : 6). This identification is also in accordance with the label included by M.C. Liberato in the specimen at LISU, although under the name Parkia africana (synonym of the currently accepted name P. biglobosa). The occurrence of this species in Annobón is remarkable, since it falls outside the range of this well known Sahel-Soudan-zone species. The propagation by seeds is only possible after seeds have been eaten by large mammals (or 100% HCl) to break down the woody seed coat, such introduction cannot have taken place without great difficulties (WIERINGA, pers. comm.). HALL et al. (1997 : 20) suggested that this species could be present in Annobón and neighbouring Cameroon and São Tomé, as a result of introductions. MIMOSOIDEAE OF EQUATORIAL GUINEA 34. — Parkia filicoidea Welw. ex Oliv. Centro Sur : Mafanebú, Guinea 202 (MA). Not previously reported from Equatorial Guinea. Widespread in tropical Africa, and reported from many African countries, also from neighbouring Cameroon and Gabon (HOPKINS 1983 : 154-155, LOCK 1989 : 99). PENTACLETHRA Benth. 35. — Pentaclethra eetveldeana De Wild. & T. Durand Litoral : Bata-Bome, cerca de Aman, Carvalho 4708 (MA-597840). Not previously reported from Equatorial Guinea. Common in West and Central Africa. This species has been reported from Angola, Cameroon, Gabon and Zaire (VILLIERS 1989 : 26, LOCK 1989 : 99). 36. — Pentaclethra macrophylla Benth. Bioko Norte : Malabo-Rebola, estrada km 89, Carvalho 4145 (MA) ; Malabo-Punta Hermosa, estrada km 10-11, Carvalho 4614 (MA) ; Malabo-Punta Hermosa, Fernández Casas 12073 (MA) ; Batoicopo, camino de Rebola, Lope del Val s.n. (MA-705834, MA-705835, MA-705836). Bioko Sur : Basacato del Oeste, Lope del Val s.n. (MA-631914). Litoral : Bata-Pembe, estrada km 17-18, Carvalho 5513 (MA) ; Corisco, Endote, Pérez Viso 1960 (MA) ; Corisco, casa de Yniestrosa, Velayos & al. 9934 (MA-706185). Río Muni : Tessmann 146 (K). Unknown province : Lope del Val s.n. (MA-389401, MA-706189, MA706190, MA-706191, MA-706192). Previously reported from Annobón (OLIVER 1871 : 322-323, EXELL 1973a : 359), Bioko (MILDBRAED 1922 : 184, EXELL 1944 : 168, GUINEA 1946 : 291, KEAY 1958 : 487, EXELL 1973a : 359) and Río Muni (GUINEA 1946 : 141, 144, 184e, 291, PARMENTIER et al. 2001 : 363). PIPTADENIASTRUM Brenan 37. — Piptadeniastrum africanum (Hook. f.) Brenan Piptadenia africana Hook. f. 17 Bioko : Fernández Casas & Carvalho 12204 (MA). Bioko Norte : Malabo-Rebola, km 2-3, Carvalho 3550 (MA) ; misión católica de Malabo, Guinea 788 (MA). Bioko Sur : MalaboLuba, estrada km 43, Carvalho 2053 (MA) ; Malabo-Riaba, km 50, cerca de Bilelipa, Carvalho 2450 (MA). Centro Sur : Mafanebú, Guinea 205 (MA). Litoral : Bata-Pembe, km 18-19, Carvalho 5160 (MA) ; Sendge à Ongamnsok, Lejoly 01/76 (BRLU). Wele Nzas : Nkolentagan, Tessmann 235 (K). Unknown province : Guinea 1169, 1171 (MA). Previously reported from Bioko (EXELL 1973a : 360) and Río Muni (GUINEA 1946 : 64b, 116, 141, 144, 291 sub Piptadenia Africana, PARMENTIER et al. 2001 : 342). SAMANEA (Benth.) Merr. 38. — (*)Samanea saman (Jacq.) Merr. Pithecellobium saman (Jacq.) Benth. Bioko Norte : Malabo, Carvalho 3705 (MA), 3813 (MA) ; pico Basilé, Lope del Val s.n. (MA705941). Previously reported from Bioko (GUINEA 1946 : 289, sub Pithecellobium saman, EXELL 1973a : 360) and Río Muni (GUINEA 1946 : 289, sub P. saman). This species originally is from South America but has been introduced in many countries all around the world. It also has been reported from neighbouring Gabon and São Tomé & Príncipe (LOCK 1989 : 84, VILLIERS 2002b : 269). TETRAPLEURA Benth. 39. — Tetrapleura tetraptera (Schumach. & Thonn.) Taub. Tetrapleura thonningii Benth. Centro Sur : Bata-Senge, km 29, Carvalho 5039 (MA) ; Bata-Senge-Mitom-Emangës, km 30-31, Carvalho 6487 (MA) ; near Gabon, McPherson 13989 (K). Wele Nzas : Nkolentagan, Tessmann 84 (K). Previously reported from Río Muni (GUINEA 1946 : 141, 144, 154, 184e, 291, sub Tetrapleura thonningii). 18 BELGIAN JOURNAL OF BOTANY 138 DOUBTFUL RECORDS Albizia moluccana Miq. This species has been reported from Bioko (GUINEA 1946 : 290, EXELL 1973a : 356). BARNEBY & GRIMES (1996) included this species sub Falcataria moluccana (Miq.) Barneby & Grimes. It originates from the islands of the Pacific Molucas and Papua New Guinea, and has been introduced in Central America. We also found this species reported sub Albizia falcataria (L.) Fosberg from several African countries like Angola, Nigeria and São Tomé (LIBERATO 1973 : 24, LOCK 1989 : 81). We have not been able to study the specimens supporting these records and, therefore, we cannot ascribe them to any accepted name. Its presence in Equatorial Guinea seems not very likely. Desmanthus virgatus (L.) Willd. This species has been reported from Río Muni (GUINEA 1946 : 291). We have not found any herbarium material of D. virgatus from Equatorial Guinea in BM, K, LISU and MA. This species originally is from America and it has been introduced in the neighbouring São Tomé & Príncipe (LOCK 1989 : 88, LUCKOW 1993 : 135), but we found neither material nor previous references from any other place in Central Africa. Hence its presence in Equatorial Guinea seems not very likely. Entada africana Guill. & Perr. This species has been reported from Bioko (OLIVER 1871 : 326, GUINEA 1946 : 291, EXELL 1973a : 358). The reference by OLIVER (1871) is based on a voucher by Mann, and OLIVER explained that the “Flora of Tropical Africa” was based on the material deposited at Kew. BERHAUT (1952) argued that this record most probably concerns Mann 20 which belongs to E. mannii. The record from GUINEA (1946) is probably based on the same specimen of Mann, while EXELL (1973a) only referred to GUINEA’S book. Although E. africana is a West and Central African species, we have not found any herbarium material of E. africana from Equatorial Guinea in BM, K, LISU and MA. Since its distribution seems to be restricted to the drier zones (BRENAN 1963 : 364), its occurrence in Equatorial Guinea seems unlikely. TABLE 1 Species that may occur in Río Muni since they have been reported from Cameroon and/or Gabon Species expected in Río Muni Albizia glaberrima (Schumach. & Thonn.) Benth. Albizia laurentii De Wild. Aubrevillea kerstingii (Harms) Pellegr. Calpocalyx atlanticus Villiers Calpocalyx brevifolius Villiers Calpocalyx letestui Pellegr. Dichrostachys cinerea (L.) Wight & Arn. Fillaeopsis discophora Harms Mimosa pigra L. Newtonia buchananii (Baker f.) G.C.C. Gilbert & Boutique Newtonia zenkeri Harms Pseudoprosopis claessensii (De Wild.) G.C.C. Gilbert & Boutique Pseudoprosopis gilletii (De Wild.) Villiers Schrankia leptocarpa DC. Source : LOCK (1989) and VILLIERS (1989). Cameroon Gabon + + + + – + + + + – + – – – + + – – + + + + + + + + + + 19 MIMOSOIDEAE OF EQUATORIAL GUINEA STATISTICAL SUMMARY The total number of indigenous and introduced taxa listed here for Equatorial Guinea is 40. The species list is based on herbarium material, with the exception of two reports from the literature: Dichrostachys cinerea and Fillaeopsis discophora, whose distribution ranges suggest they may occur in Equatorial Guinea. It is known that Equatorial Guinea is poorly explored from a botanical point of view. The history and intensity of botanical expeditions has been quite different for the three main regions of the country (AEDO & VELAYOS 2001), with Río Muni being the less explored territory. Although we present 37 taxa in this paper, many species reported from both Cameroon and Gabon have not been found yet. For example the flora of Gabon (260 000 km2) includes 45 species of Mimosoideae. If we assume Río Muni (26 000 km2) can shelter such a number of species, about 82% of the species have already been found. Species that can be expected to occur in Río Muni, including our two reports accepted from the literature, are listed in Table 1. We hope that this would facilitate future explorations. It is interesting to note that the number of indigenous Mimosoideae species found on the islands of the Gulf of Guinea decreases as the distance to the mainland increases (Table 2). However, other factors such as size of the island or altitudinal range could contribute to explain these differences in species number. The high number of species found in Bioko reflects the continental influence in this island (EXELL 1973b : 7), since it is only separated 32 km from Cameroon coast. Eight introduced species were included in the checklist, since they may be naturalized in Equatorial Guinea owing to human activity. This number of aliens is similar to those found in neighbouring Gabon (9 species, VILLIERS 1989) and São Tomé & Príncipe (13 species, LIBERATO 1973). The most striking is the high percentage of naturalized Mimosoideae in São Tomé & Príncipe (76%) and Bioko (38%) in comparison with Río Muni (21%) or Gabon (20%) (Table 2). Gabon and Equatorial Guinea are two of the countries of West and Central Africa with the largest percentage of original closed canopy forest (88.2% 227 500 km2 and 65.4% - 17 004 km2, respectively ; HAMILTON 1994). On the other hand, São Tomé & Príncipe and Bioko have been intensively culti- TABLE 2 Indigenous and introduced species of Mimosoideae from Mt. Cameroon and the four island of the Gulf of Guinea Mt. Cameroon1 Bioko Príncipe2 São Tomé2 Annobón 13 1 11 7 2 3 4 13 1 1 Indigenous Introduced Source : 1CABLE & CHEEK (1998) and 2LIBERATO (1973). TABLE 3 Number species and genera of Mimosoideae, Cyperaceae and Melastomataceae from Equatorial Guinea Family Annobón Bioko Río Muni Equatorial Guinea Mimosoideae Genera Species 2 2 12 18 21 37 21 40 Cyperaceae1 Genera Species 5 13 14 45 16 73 20 95 Melastomataceae2 Genera Species 4 6 12 23 15 49 17 57 Source : 1CABEZAS et al. (2004) and 2PARMENTIER & GEERINCK (2003). 20 BELGIAN JOURNAL OF BOTANY 138 vated for a long time, and in the former only 299 km2 (31.1%) of original closed forests have remained untouched. In Equatorial Guinea Mimosoideae are comparatively poor in species but rich in genera (Table 3). According to VILLIERS (1989 : 13) this is a characteristic of the Mimosoideae in Africa, where there are a great number of monospecific genera or genera with few species, such as Aubrevillea, Cylicodiscus or Piptadeniastrum. ACKNOWLEDGEMENTS The authors wish to thank G. Lewis and especially L. Rico for their valuable help in our work at Kew. We also thank R. Vickery (BM), I. Melo and A.I. Correia (LISU) for their support at these herbaria. We are indebted to T.D. Pennington for his revision of Inga specimens and Jan Wieringa for his critical and valuable review of the manuscript. 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PARMENTIER I., LEJOLY J. & NGUEMA N., 2001. — La végétation des inselbergs de Piedra Nzas (Guinée Équatoriale continentale). Acta Bot. Gallica 148 : 341-365. PENNINGTON T. D., 1997. — The genus Inga : botany : 844 p. The Royal Botanic Gardens, Kew, U.K. POLHILL R. M. & RAVEN P. H. (eds.), 1981. — Advances in legume systematics, part 1 : 426 p. Royal Botanic Gardens, Kew and Ministry of Agriculture, Fisheries and Food, London. ROSS J. H., 1979. — A conspectus of the African Acacia species. Mem. Bot. Surv. S. Africa 44 : 1-155. SOBRINHO L. G., 1953. — Vascular plants from Ano Bom and Príncipe islands collected by F. Newton and J. de Souza Junior. Portugaliae Acta Biol., Sér. B, Sist. 4 : 177-190. VELAYOS M., AEDO C. & PÉREZ VISO R., 2001. Check-list of the Pteridophytes of Equatorial Guinea. Belg. J. Bot. 134 : 145-191. VILLIERS J. F., 1984. — Le Genre Calpocalyx (Leguminosae, Mimosoideae). Adansonia, section B 3 : 297-311. VILLIERS J. F., 1989. — Flore du Gabon, fascicule 31 : Leguminosae-Mimosoideae : 185 p. Muséum National d’Historie Naturelle, Paris. VILLIERS J. F., 1990. — Contribution à l’étude du genre Newtonia Baillon (Leguminosae-Mimosoideae) en Afrique. Bull. Jard. Bot. Nat. Belg. 60 : 119138. VILLIERS J. F., 2002a. — Dichrostachys. In : PUY D. J. (ed.). The Leguminosae of Madagascar, pp. 206218. Royal Botanic Gardens, Kew, U.K. VILLIERS J. F., 2002b. — Albizia. In : PUY D. J. (ed.). The Leguminosae of Madagascar, pp. 243-271. Royal Botanic Gardens, Kew, U.K. 22 BELGIAN JOURNAL OF BOTANY 138 INDEX TO SCIENTIFIC NAMES Accepted names are in boldface. Synonyms are in italics. Doubtful records are in normal type. A Acacia Mill. ............................................................. farnesiana (L.) Willd. ....................................... kamerunensis Gand ......................................... pennata auct. ..................................................... pentagona (Schumach. & Thonn.) Hook. f. .... Adenanthera L. ...................................................... pavonina L. ...................................................... Adenopodia C. Presl .............................................. scelerata (A. Chev.) Brenan ............................. Albizia Durazz. ....................................................... adianthifolia (Schumach.) W. Wight ............... brownei (Walp.) Oliv. ....................................... falcataria (L.) Fosberg ...................................... fastigiata Oliv. .................................................. ferruginea (Guill. & Perr.) Benth. ................... gummifera (J. F. Gmel.) C.A. Sm. .................. intermedia De Wild. & T. Durand .................... lebbeck (L.) Benth. .......................................... moluccana Miq. ................................................ zygia (DC.) J. F. Macbr. ................................... Aubrevillea Pellegr. ................................................ platycarpa Pellegr. ........................................... 12 12 12 12 12 12 12 12 12 13 13 13 18 13 13 13 13 13 18 13 13 13 mannii (Oliv.) Tisser .................................. 14, 18 rheedii Spreng ................................................. 14 scandens Benth. ................................................ 14 F Falcataria moluccana (Miq.) Barneby & Grimes .... 18 Fillaeopsis Harms ................................................... 15 discophora Harms ...................................... 15, 19 I Inga Mill. ................................................................ 15 edulis Mart. ...................................................... 15 rodrigueziana Pittier ......................................... 15 L Leucaena Benth. .................................................... 15 glauca (Willd.) Benth. ...................................... 15 leucocephala (Lam.) De Wit ............................ 15 leucocephala (Lam.) De Wit subsp. leucocephala .................................................................... 15 leucocephala subsp. glabrata (Rose) Zárate .. 15 M C Calliandra Benth . .................................................. surinamensis Benth. ........................................ Calpocalyx Harms .................................................. dinklagei Harms ............................................... heitzii Pellegr. ................................................... klainei Pierre ex Harms .................................... ngouniensis Pellegr. ......................................... Cathormion (Benth.) Hassk ................................... altissimum (Hook. f.) Hutch. & Dandy ........... Cylicodiscus Harms ............................................... gabunensis Harms ............................................ 13 13 13 13 14 14 14 14 14 14 14 D Desmanthus virgatus (L.) Willd. ............................. 18 Dichrostachys (DC.) Wight & Arn. ....................... 14 cinerea (L.) Wight & Arn. ......................... 14, 19 nutans Benth. ..................................................... 14 E Entada Adans. ........................................................ 14 africana Guill. & Perr. ...................................... 18 gigas (L.) Fawc. & Rendle ............................... 14 Mimosa L. ............................................................... 15 pudica L. ........................................................... 15 N Newtonia Baill. ...................................................... 15 duparquetiana (Baill.) Keay ............................ 15 glandulifera (Pellegr.) G. C. C. Gilbert & Boutique.................................................................. 16 grandifolia Villiers ............................................ 16 griffoniana (Baill.) Baker f. ............................. 16 klainei Pierre ex Harms .................................... 16 leucocarpa (Harms) G. C. C. Gilbert & Boutique ................................................................. 16 zenkeri Harms ................................................... 16 P Parkia R. Br. .......................................................... africana R. Br. .................................................. bicolor A. Chev. ............................................... biglobosa (Jacq.) R. Br. ex G. Don .................. clappertonia Keay ............................................ filicoidea Welw. ex Oliv. .................................. klainei Pierre ex De Wild. ................................ 16 16 16 16 16 17 16 23 MIMOSOIDEAE OF EQUATORIAL GUINEA oliveri J. F. Macbr. ............................................ zenkeri Harms .................................................... Pentaclethra Benth. ............................................... eetveldeana De Wild. & T. Durand .................. macrophylla Benth. ......................................... Piptadenia africana Hook. f. .................................. Piptadenia mannii Oliv. .......................................... Piptadeniastrum Brenan ...................................... africanum (Hook. f.) Brenan ........................... Pithecellobium altissimum (Hook. f.) Oliv. ............ Pithecellobium saman (Jacq.) Benth. ..................... 16 16 17 17 17 17 14 17 17 14 17 S Samanea (Benth.) Merr. ......................................... 17 saman (Jacq.) Merr. ......................................... 17 T Tetrapleura Benth. ................................................. 17 tetraptera (Schumach. & Thonn.) Taub. ......... 17 thonningii Benth. .............................................. 17 LIST OF COLLECTIONS Species are indicated by a number in parentheses corresponding to the number in the checklist. Carvalho 2020 (25.a) ; 2053 (37) ; 2253 (21) ; 2344 (22) ; 2450 (37) ; 2566 (25.b) ; 2672 (9) ; 2816 (26) ; 3487 (3) ; 3521 (21) ; 3550 (37) ; 3618 (24) ; 3705 (38) ; 3782 (10) ; 3804 (21) ; 3813 (38) ; 3846 (9) ; 3939 (22) ; 3957 (3) ; 4019 (21) ; 4145 (36) ; 4198 (30) ; 4248 (10) ; 4456 (30) ; 4614 (36) ; 4708 (35) ; 4775 (16) ; 4881 (3) ; 5039 (39) ; 5160 (37) ; 5302 (20) ; 5384 (13) ; 5421 (6) ; 5478 (32) ; 5513 (36) ; 5682 (13) ; 5687 (15) ; 5909 (5) ; 6128 (15) ; 6487 (39). Castroviejo 9160 (26). Davies 215 (26). Eneme & Lejoly 43 (27). Fernández Casas 10056 (24) ; 10109 (25.b) ; 10177 (24) ; 10270 (9) ; 11680 (22) ; 11684 (25.b) ; 12010 (9) ; 12012 (25.a) ; 12037 (4) ; 12073 (36). Fernández Casas & Carvalho 11416 (24) ; 12204 (37). Guinea 11-374 (20) ; 123 (25.a) ; 202 (34) ; 205 (37) ; 299 (17) ; 326 (8) ; 502-203 (8) ; 525 (2) ; 611 (26) ; 628 (25.a) ; 775 (20) ; 776 (20) ; 777 (20) ; 788 (37) ; 1166bis (17) ; 1169 (37) ; 1171 (37) ; 1814 (2) ; 1816 (2). Lejoly 01/76 (37) ; 93/351 (10) ; 95/188 (13) ; 95T/L3768 (28) ; 99/301T2 (6). Lisowski M-569 (27) ; M-770 (1). Mann 20 (21) ; 230 (20) ; 414 (21) ; 416 (9). McPherson 13989 (39). Nguema, Esono & Lejoly 244 (29). Obama 837 (14). Pérez Viso 86 (30) ; 1318 (20) ; 1678 (24) ; 1960 (36) ; 2084 (18) ; 2294 (26) ; 2345 (18) ; 2408 (3) ; 2584 (13) ; 2717 (26) ; 2785 (25.a) ; 3562 (12) ; 3956 (20). Senterre & Obiang 3170 (31) ; 3641 (27) ; 3865 (11) ; 4098 (7). Senterre, Obiang & Esono 2906 (6). Senterre & Ngomo 672 (30) ; 846 (29). Swarbrick 2930 (24). Tessmann 12 (13) ; 84 (39) ; 146 (36) ; 175 (10) ; 209 (18) ; 235 (37) ; 242 a (6) ; 582 (22) ; 646 (13) ; 845 (10) ; 1077 (18). Velayos 9934 (36). Vogel 79 (25.a). Wilks 3564 (14).