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 : [email protected]) Received 5 April 2004 ; accepted 19 October 2004. ————————————————————————————————————————— ABSTRACT. — A checklist of the Mimosoideae (Leguminosae) of Equatorial Guinea com- prising 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 (Legu- minosae), Río Muni. ————————————————————————————————————————— INTRODUCTION and the available historical specimens have per- The Leguminosae form the third largest plant mitted the preparation of checklists of several family of the world, comprising about 650 genera groups: Pteridophytes (HERRERO et al. 2001, and ca. 18000 species. The subfamily Mimosoi- VELAYOS et al. 2001), Piperaceae (FERO et al. deae, with ca. 3000 species in 50-60 genera, are 2003), Melastomataceae (PARMENTIER & GEERINCK distributed worldwide and are abundant in tropi- 2003) and Cyperaceae (CABEZAS et al. 2004). This cal, subtropical and warm-temperate areas work has been complemented by studies on the (POLHILL & RAVEN 1981). In tropical Africa Aca- inselbergs vegetation carried out by botanists cia, Albizia, Entada and Newtonia are the richest from the Université Libre de Bruxelles (LEJOLY & in number of species (LEBRUN & STORK 1992). LISOWSKI 1999, PARMENTIER 2001, 2003, PARMEN- Important works on Mimosoideae of West TIER et al. 2001). tropical Africa include those of OLIVER (1871) and The aim of this paper is to update the cata- KEAY (1958). The most recent work on Mimo- logue of Mimosoideae for the whole of Equatorial soideae from the region is VILLIERS (1989). Guinea including both bibliographic records and A complete account of the Mimosoideae herbarium material. This checklist is a new step (Leguminosae) of Equatorial Guinea has never towards a modern Flora of Equatorial Guinea. been published. Although they were included in the general vascular plant catalogue of GUINEA MATERIAL AND METHODS (1946), this author added plants that he presumed to be present in Equatorial Guinea. The checklist is primarily based on herbarium Over the last 20 years the Real Jardín specimens. We have studied more than 140 specimens Botánico has carried out intensive fieldwork in from BM, BRLU, K, LISU and MA, including both the both Bioko and Río Muni. These new collections historic collections made during British expeditions by 12 BELGIAN JOURNAL OF BOTANY 138 Mann, Tessmann and Vogel, and modern collections South Africa, Tanzania, Togo, Uganda and Zim- obtained by both Belgian and Spanish expeditions. babwe, and reported as planted or an escape from Bibliographic references for the legumes of cultivation (LOCK 1989 : 67, ROSS 1979 : 102). Equatorial Guinea have also been checked (AEDO et al. 1999). Two species are included, that are based only on 2. — Acacia kamerunensis Gand. literature records since their distribution areas make Acacia pennata auct. their presence in Equatorial Guinea probable. They are quoted with the number between brackets. Eight intro- Bioko Norte : Monte Balea, Guinea 525 duced species are presented in the checklist; they are (MA). Bioko Sur : Musola, finca Puente, Guinea marked with an asterisk (*) before the accepted name. 1814 (MA), 1816 (MA). The locality names used in this checklist have Previously reported from Río Muni (GUINEA been brought up-to-date following VELAYOS et al. 1946 : 149, sub Acacia pennata). (2001 : 147-149), in which a gazeteer including geo- graphical coordinates can be found. 3. — Acacia pentagona (Schumach. & Thonn.) The checklist is alphabetically ordered by genera Hook. f. and species. Generic circumscription is in accordance with LOCK (1989), although recent molecular data sug- Bioko Norte : Malabo – pico Basilé, km 7-8, gest that Acacia should be divided into three or four Carvalho 3478 (MA), 3957 (MA). Centro Sur : genera (MASLIN et al. 2003). When available we used Niefang-Bindeng, pista hacia el río Uoro, Pérez monographs or regional works as those of VILLIERS Viso 2408 (MA). Litoral : Bata-Monson-Dibolo, (1984, 1990). Mbubuin, Carvalho 4881 (MA). Under each accepted name a list of synonyms Previously reported from Río Muni (BRENAN used in the relevant literature is given. Specimens are & EXELL 1957 : 134). ordered alphabetically by the different regions and provinces: Annobón, Bioko (provinces of Bioko Norte ADENANTHERA L. and Bioko Sur) and Río Muni (provinces of Centro Sur, Kie Ntem, Litoral and Wele Nzas). 4. — (*)Adenanthera pavonina L. Previous bibliographical records of each taxon are Bioko Sur : Luba-Veiga y Avendaño, grouped under the already mentioned three regions. When a taxon was reported under a different name Fernández Casas 12037 (MA). UINEA (synonym) it is indicated as follows: GUINEA 1946 : 289, Previously reported from Bioko (G sub Pithecellobium saman. In the case of a misidentifi- 1946 : 291, EXELL 1973 : 356) and Río Muni cation the author’s name is included following the cited (GUINEA 1946 : 291). species (LOCK 1989 : 86, sub Inga rodrigueziana Originally a species from tropical Asia and Pittier). Doubtful records are placed at the end of the nowadays naturalised in many other areas. In checklist. Africa this species has been reported from neigh- bouring Cameroon, Gabon and São Tomé (LOCK THE CHECKLIST 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 vil- Litoral : Bata-Niefang, km 35, Adjape Bibak lage, cultivé, Lisowski M-770 (BRLU). y Nco, Carvalho 5909 (MA). Previously reported from Bioko (GUINEA Not previously reported from Equatorial 1946 : 290 ; EXELL 1973a : 355) and from Río Guinea. This species is distributed in West and Muni (GUINEA 1946 : 290). Central Africa, and reported from Angola, This species is native to America but it has Cameroon, Gabon, Ghana, Ivory Coast, Liberia, been introduced in many African countries : Nigeria, Chad and Zaire (BRENAN 1985 : 76-77, Ethiopia, Ghana, Libya, Mozambique, Rhodesia, LOCK 1989 : 87). MIMOSOIDEAE OF EQUATORIAL GUINEA 13 ALBIZIA Durazz. Originally from Asia, this species has been introduced in almost all tropical regions (VILLIERS 6. — Albizia adianthifolia (Schumach.) W. 1989 : 156, LOCK 1989 : 82). Wight Albizia fastigiata Oliv. 10. — Albizia zygia (DC.) J.F. Macbr. Albizia intermedia De Wild. & T. Durand Albizia brownei (Walp.) Oliv. Centro Sur : Bata-Mongo, zona forestal de Bioko Norte : Malabo-Baney, estrada km 5- ALOSA, km 57-58, Carvalho 5421 (MA) ; P.N. 6, Carvalho 3782 (MA), Malabo-Punta Hermosa, Monte Alén, près du village de Monte Alén, estrada km 7-8, Carvalho 4248 (MA). Centro Senterre, Obiang & Esono 2906 (BRLU). Wele Sur : P.N. Monte Alén, entre 0 et 1 km à l’ouest du Nzas: dalle rocheuse à 3 km au S de Asoc, Lejoly village de Ale, Lejoly 93/351 (BRLU). Wele 99/301T2 (BRLU) ; Nkolentagan, Tessmann 242a Nzas : Nkolentagan, Tessmann 175, 845 (K). (K). Previously reported from Bioko (EXELL Previously reported from Río Muni (GUINEA 1973a : 356) and Río Muni (GUINEA 1946 : 141, 1946 : 141 and 290, sub Albizia fastigiata, 144, sub Albizia brownei). PARMENTIER et al. 2001 : 361) and from Equatorial AUBREVILLEA Pellegr. Guinea (BRENAN 1953 : 520, sub A. intermedia, KEAY 1958 : 503, sub A. intermedia). 11. — Aubrevillea platycarpa Pellegr. 7. — Albizia ferruginea (Guill. & Perr.) Benth. Centro Sur: P. N. Monte Alén, 3,7 km au W de Aconangui, Senterre & Obiang 3865 (BRLU). Centro Sur : P.N. Monte Alén, 1 km au E de Not previously reported from Equatorial la Cabaña de Mosumo, Senterre & Obiang 4098 Guinea. This species has been reported from (BRLU). neighbouring Cameroon and Gabon (VILLIERS Not previously reported from Equatorial 1989 : 36, LOCK 1989 : 87). Guinea. Common in tropical Africa and reported CALLIANDRA Benth. from neighbouring Cameroon and Gabon (LOCK 1989 : 81). 12. — (*)Calliandra surinamensis Benth. 8. — Albizia gummifera (J.F. Gmel.) C.A. Sm. Litoral : Eyan Bot, Bata–Cogo, km 12, Pérez Viso 3562 (MA). Centro Sur : Evinayong, Guinea 326 (MA), Not previously reported from Equatorial 502-203 (MA). Guinea. This species is originally from America, Not previously reported from Equatorial it has been introduced in Africa and reported from Guinea. Common in tropical Africa and reported neighbouring Gabon (VILLIERS 1989 : 171). from neighbouring Cameroon (LOCK 1989 : 82). CALPOCALYX Harms 9. — (*)Albizia lebbeck (L.) Benth. 13. — Calpocalyx dinklagei Harms Bioko : Mann 416 (K). Bioko Norte : Mala- bo, junto al Ministerio de Agricultura, Carvalho Centro Sur : P.N. Monte Alén, Lejoly 95/188 3846 (MA). Bioko Sur : Luba-Malabo, km 2 do (BRLU). Litoral : Bata-Pembe, km 28-29, cruzamento, Carvalho 2672 (MA) ; cerca de Carvalho 5384 (MA) ; Bata-Niefang, km 35, zona Luba, dirección a Batete, Fernández Casas 10270 de Comaya, Carvalho 5682 (MA). Wele Nzas : & al. (BM, K, MA) ; Luba-Veiga