1. Family: Fabaceae Lindl.
    1. Genus: Mucuna Adans.
      1. Mucuna occidentalis (Hepper) T.M.Moura & G.P.Lewis

        This species is accepted, and its native range is W. & W. Central Tropical Africa.

    [KBu]

    Moura, T.M. & Lewis, G.P. 2014. Taxonomic studies in the Mucuna poggei complex (Leguminosae: Papilionoideae). Kew Bulletin 69: 9544. https://doi.org/10.1007/s12225-014-9544-7

    Habit
    Lianas with short hairs on the stems
    Leaves
    Leaves alternate, 3-foliolate; stipules caducous; petiole 7.5 – 20 cm long, rachis 2 – 3 cm long; stipels linear, 1 – 4 mm long, persistent; petiolules 7 – 10 mm long; the apical leaflet obovate to elliptic, 7 – 15.5 × 7.5 – 11 cm, obtuse to rounded at base, acute at apex, the lateral leaflets asymmetrical, 10.5 – 16.5 × 8 – 15 cm, obtuse, rounded or slightly subcordate at base (some sinuose along the proximal margin of the base), acute to acuminate at apex, the hairs short and sparse on the abaxial surface of the leaflets
    Inflorescences
    Inflorescence a pseudoraceme; peduncle 3 – 12 cm long; rachis 14 – 30 cm long; bracts caducous; pedicels c- 1 cm long, 3 flowers per fleshy node
    Flowers
    Flowers 6 – 8 cm long
    Calyx
    Calyx brownish (R. A. A. Oldeman 284, K) or greenish brown, reddish brown hairy, with irritating hairs (W. J. J. O. de Wilde 789, K), sericeous, campanulate, with appressed hairs 1.9 – 2.5 cm long on outer and inner surfaces; lobes 4, the adaxial one formed by two connate sepals, the abaxial one 7 – 12 mm long, the other two lobes 4 – 5 mm long.
    Corolla
    Corolla white (R. A. A. Oldeman, 284 K), whitish, tinged greenish (W. J. J. O. de Wilde 789, K) or cream-coloured, slightly tinged green in parts, often with irregular blue-black margins (F. C. Deighton 5600, K); standard 4.2 – 4.5 × 3 – 3.7 cm, broadly elliptic to obovate, rounded at apex and sagittate at base, the claw c. 3 – 4 mm long, glabrous; wing petals 6 – 7.5 × 1.5 – 3 cm, oblong to obovate, basally attenuate, apically rounded to obtuse, pubescent at base, the claw c. 4 – 6 mm long; keel petals 6 – 7.5 × 1.5 – 2 cm, oblong, attenuate at base, acute to obtuse at apex, pubescent at base, the claw 6 – 8 mm long.
    Stamens
    Stamens 10, diadelphous, with nine stamens fused, one free; filaments 4.5 – 7 cm long, glabrous; anthers dimorphic, five of them deltoid, 3 mm long, basifixed, the other five globose, 2 mm long, dorsifixed
    Gynoecium
    Gynoecium 6 – 7.5 cm long; ovary sessile, oblong, c- 3 × 1 mm, densely sericeous; style 5 – 6.5 cm long, densely sericeous, glabrescent at apex, the stigma peltate
    Fruits
    Fruit indehiscent, oblong, the surface covered by reddish irritating hairs
    Seeds
    Seeds circular, and laterally compressed, 1.5 × 1.7 cm, dark brown, hilum brown, 12 mm long
    Distribution
    Mucuna occidentalis occurs mainly in the West of the African Continent in: Burkina Faso, Ghana, Cameroons, Central African Republic, Togo, Democratic Republic of Congo, Ivory Coast, Liberia, Nigeria and Sierra Leone (Map 1).
    Ecology
    This species is reported from gallery forest, along river banks, in seasonally inundated grassland and savanna.
    Note
    Mucuna occidentalis differs from M. poggei mainly in the short sparse hairs on the abaxial surface of the leaflets in M. occidentalis vs the long dense hairs in M. poggei; in the 1 – 4 mm long stipels in M. occidentalis vs 5 – 6 mm long in M. poggei; the 7 – 12 mm long abaxial calyx lobe in M. occidentalis vs c. 5 mm long in M. poggei; and the deltoid basifixed anthers in M. occidentalis vs oblong in M. poggei. Although the two taxa are morphologically similar in fruit characters, we consider M. occidentalis a distinct species based on the differences listed above. In addition, the two taxa only overlap in geographical distribution in the Democratic Republic of Congo — M. occidentalis occurs in the west of the African Continent (Sierra Leone to the north of the Democratic Republic of Congo), whilst M. poggei occurs mainly in the east and southeast.

    Two type specimens together with a carpological box (Deighton 5600) are housed in herbarium K. The two type sheets have Kew barcode numbers K 263326 and K 263327. One of these (K 263327) consists of branches and inflorescence rachises without any leaf or flower, while the other (K 263326) comprises two small packets, one containing flowers and the other leaflets, petioles and petiolules but no stems or inflorescence rachises. It is clear that the packets on sheet K 263326 contain plant fragments fallen from sheet K 263327. The fruits in the carpological collection are also part of the original collection that were too bulky to be mounted on the herbarium sheet. We therefore consider that lectotypification is not necessary because there is no ambiguity about the type collection. We consider Deighton 5600 (K) to be the holotype comprising three elements: two herbarium specimens and one carpological box.

    Images

    Distribution

    Native to:

    Benin, Burkina, Cameroon, Central African Repu, Gabon, Ghana, Ivory Coast, Liberia, Mali, Nigeria, Senegal, Sierra Leone, Togo, Zaïre

    Mucuna occidentalis (Hepper) T.M.Moura & G.P.Lewis appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Aug 1, 1975 Letouzey, R. [14184], Cameroon Mucuna poggei var. occidentalis K000094100
    Aug 1, 1975 Letouzey, R. [14184], Cameroon Mucuna poggei var. occidentalis K000094101
    Deighton, F.C. [5600], Sierra Leone Mucuna poggei var. occidentalis K000263326 holotype
    Deighton, F.C. [5600], Sierra Leone Mucuna poggei var. occidentalis K000263327 holotype

    First published in Kew Bull. 69(4): (2014)

    Accepted by

    • van der Maesen, L.J.G. & Sosef, M.S.M. (2016). Flore du Gabon 49: 1-407. Muséum National d'Histoire Naturelle, Paris.

    Literature

    Kew Backbone Distributions
    • van der Maesen, L.J.G. & Sosef, M.S.M. (2016). Flore du Gabon 49: 1-407. Muséum National d'Histoire Naturelle, Paris.
    • Moura, T.M. & Lewis, G.P. (2014). Taxonomic studies in the Mucuna poggei complex (Leguminosae: Papilionoideae) Kew Bulletin 69(9544): 1-9. Royal Botanic Gardens, Kew.
    • Thiombiano, A., Schmidt, M., Dressler, S., Ouédraogo, A., Hahn, K. & Zizka, G. (2012). Catalogue des plantes vasculaires du Burkina Faso Boissiera 65: 1-391.
    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Aké Assi, L. (2001). Flore de la Côte-d'Ivoire: catalogue systématique, biogéographie et écologie. I Boissiera 57: 1-396.
    • Boudet, G., Lebrun, J.P. & Demange, R. (1986). Catalogue des plantes vasculaires du Mali: 1-465. Etudes d'Elevage et de Médecine Vétérinaire des Pays Tropicaux.
    • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.

    Sources

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    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 Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Bulletin
    Kew Bulletin
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0