1. Family: Apocynaceae Juss.
    1. Genus: Alstonia R.Br.
      1. Alstonia boonei De Wild.

        This species is accepted, and its native range is W. Tropical Africa to Ethiopia and Tanzania.

    [FWTA]

    Apocynaceae, H. Huber. Flora of West Tropical Africa 2. 1963

    Habit
    Tree 30-120 ft. high with whorled leaves and branches
    Inflorescences
    Many-flowered terminal inflorescences
    Fruits
    Paired, narrowly-cylindric fruiting follicles 12-20 in. long.
    [FTEA]

    Apocynaceae, E.A. Omino. Flora of Tropical East Africa. 2002

    Habit
    Tree 25–30(–40) m high with white latex; trunk up to 1.4 m in diameter, with or without buttresses up to 8 m high; bark grey, white or yellowish, smooth or scaly.
    Leaves
    Leaves in whorls of 4–9, petiolate; blade (narrowly) obovate, rarely oblong, 8–19(–24) cm long, 3.5–7.5 cm wide, acuminate, rarely obtuse or retuse at the apex, decurrent into the petiole, coriaceous; secondary veins in 25–50(–60) pairs, forming an angle of almost 90° with the midrib and a neat submarginal vein; petiole 0.6–2.9 cm long.
    Inflorescences
    Inflorescence compound-subumbellate, 7.5–23 cm long, pubescent in all parts; bracts small, sepal-like; pedicel 0.2–0.6 cm long.
    Flowers
    Flowers with sepals broadly ovate, 1–2.2 mm long, 1–2.7 mm wide; corolla yellow-green to pale green; lobes pale yellow, rarely white, salver-shaped; tube 6.5–14 mm long; lobes obliquely ovate or obovate, 2.5–6.5 mm long, acute or obtuse; pistil 4.5–11.5 mm long.
    Fruits
    Fruits of two linear follicles, 22–57 cm long, 0.2–0.4 cm wide, pubescent, dehiscent; seeds many, in two rows, with a thickened margin, bearing long stiff hairs at the ends and much shorter ones at the side.
    Figures
    Fig. 20 (p. 59).
    Habitat
    Rainforest, ground-water or riverine forest; 800–1200 m
    Distribution
    T4 U2 U4 from Senegal to Ethiopia to Congo (Kinshasa)

    Distribution

    Native to:

    Benin, Cabinda, Cameroon, Central African Repu, Congo, Equatorial Guinea, Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Nigeria, Senegal, Sierra Leone, Sudan, Tanzania, Togo, Uganda, Zaïre

    Alstonia boonei De Wild. appears in other Kew resources:

    First published in Repert. Spec. Nov. Regni Veg. 13: 382 (1914)

    Accepted by

    • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
    • Lejoy, J., Ndjele, M.-B. & Geerinck, D. (2010). Catalogue-flore des plantes vasculaires des districts de Kisangani et de la Tshopo (RD Congo) Taxonomania. Revue de Taxonomie et de Nomenclature Botaniques 30: 1-307.
    • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
    • Catarino, L., Martins, E.S., Diniz, M.A. & Pinto-Basto, M.F. (2006). Check-list da flora vascular do parque natural das Lagos de Cufada (Guiné-Bissau) Garcia de Orta, Série de Botânica 17: 97-141.
    • Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon Scripta Botanica Belgica 35: 1-438.
    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Harris, D.J. (2002). The vascular plants of the Dzanga-Sangha Reserve, Central African Republic: 1-274. National Botanic Garden (Belgium), Meise.
    • Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 1-529. MIM, Deurne.
    • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.

    Literature

    Flora of West Tropical Africa
    • in Fedde Rep. 13: 382 (1814).
    Kew Backbone Distributions
    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.
    Flora of Tropical East Africa
    • Hamilton, Field Guide Uganda For. Trees: 163 (1981).
    • De Jong in Meded. Landbouwhogeschool 79 (13): 5, t. 1 (1979).
    • Huber in Flora of West Tropical Africa ed. 2, (2): 68 (1963).
    • W.J. Eggeling, Indigenous Trees of the Uganda Protectorate ed. 2: 24, t. 5 (1952).
    • de Wild. in Bulletin du Jardin Botanique de l'État a Bruxelles 5: 405 (1919).
    • De Wild. in F. Fedde, Repertorium Speciorum Novarum Regni Vegetabilis 13: 382 (1914)

    Sources

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Flora of West Tropical Africa
    Flora of West Tropical Africa
    http://creativecommons.org/licenses/by-nc-sa/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 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