1. Family: Apocynaceae Juss.
    1. Pleioceras Baill.

      1. This genus is accepted, and its native range is Tropical Africa.

    [FZ]

    Apocynaceae, A. J. M. Leeuwenberg & F. K. Kupicha et al. Flora Zambesiaca 7:2. 1985

    Habit
    Shrubs, lianas or trees up to 9 m. high, with white latex.
    Stem
    Branches unarmed, with pale lenticels; branchlets terete, often sulcate when dry.
    Leaves
    Leaves opposite, those of a pair equal or subequal, shortly petiolate, with colleters in one or two rows in the axils; lamina acuminate, rounded or cuneate at the base.
    Inflorescences
    Inflorescences terminal, paniculate, several- to many-flowered, lax. Lower bracts leafy; others narrowly oblong, acute, with colleters in the axils.
    Flowers
    Flowers actinomorphic except for the sometimes slightly unequal sepals, small.
    Calyx
    Calyx persistent beneath the fruit; sepals green, connate at the base, ovate, imbricate, entire, pubescent or glabrous outside, ciliate, inside at the base near the edge with 0–1 triangular or ovate colleters (in whole flower 3–10).
    Corolla
    Corolla subhypocrateriform; tube yellow and violet or dark-red, ventricose in the middle, outside glabrous at the base and minutely pubescent at the apex, inside at the apex just below the appendages with a narrow pilose zone; lobes yellow with a brownish-violet tinge, in the bud overlapping to the left, elliptic, rounded, entire, ciliate, minutely pubescent outside, with an alternating set of appendages inside. Appendages bright yellow, in a set of 1–3, shortly truncate or filiform, glabrous or pubescent, plus 2–4 long filiform glabrous ones.
    Stamens
    Stamens exserted, but covered by the appendages; filaments short, filiform, glabrous outside, inside hispid towards the apex and with a triangular swelling on the base of the connective; anthers introrse, sagittate at the base, apiculate and pilose at the apex, otherwise glabrous, fertile for y of the length just below the apices.
    Pistil
    Pistil glabrous or sometimes with a few papillae; ovary superior, subglobose; carpels two, free, rounded; disk none; style split at the base; clavuncula with a thin ring at the base, almost cylindrical, covered by the anthers and inside with the triangular swellings of the connectives adnate to the clavuncula; stigma minute, bilobed.
    Ovules
    Ovules numerous, in several rows.
    Fruits
    Follicles 2, spreading, almost free, pendulous, slender, adaxially dehiscent, glabrous; wall thinly coriaceous, striate, grooved when dry, glabrous outside.
    Seeds
    Seeds numerous, in two or more rows, linear to very narrowly oblong, finely grooved, glabrous, with a ± dense tuft of retrorse hairs at the apices, embryo large, surrounded by the very scanty whitish endosperm.
    [FTEA]

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

    Habit
    Shrubs, lianas or trees with white latex in bark and leaves
    Leaves
    Leaves opposite, petiolate, with colleters in one or two rows in the axils
    Inflorescences
    Inflorescences terminal, paniculate, several- to many-flowered, lax
    Flowers
    Flowers 5-merous
    Calyx
    Sepals persistent in fruit, connate at the base, ciliate, with colleters within
    Corolla
    Corolla salver-shaped, ventricose at the middle; lobes contorted in bud, overlapping to the left, inside with 2 sets of appendages
    Stamens
    Stamens exserted, covered by appendages; filaments short, hispid towards the apex, with a triangular swelling on the base of the connective, adnate to the pistil head; anthers introrse, sagittate, apiculate, pilose at the apex, partly fertile
    Pistil
    Pistil glabrous, ovary superior, subglobose, 2-celled, cells free; disk absent; style split at the base; pistil head cylindrical with a thin ring at the base; stigma bifid; ovules numerous
    Fruits
    Fruits of 2 spreading almost free, pendulous, follicularmericarps, slender, dehiscent; pericarp thin, glabrous
    Seeds
    Seeds numerous, linear to oblong, with a dense tuft of hairs at the apex directed towards the base of the fruit; embryo large; cotyledons complicate.

    Images

    Distribution

    Native to:

    Angola, Benin, Cameroon, Congo, Gabon, Ghana, Guinea, Ivory Coast, Kenya, Liberia, Mozambique, Nigeria, Sierra Leone, Tanzania, Zaïre

    Pleioceras Baill. appears in other Kew resources:

    First published in Bull. Mens. Soc. Linn. Paris 1: 759 (1888)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Flora of West Tropical Africa
    • —F.T.A. 4, 1: 165.
    Flora Zambesiaca
    • Hist. PI. 10: 210 (1889).
    • in Bull. Soc. Linn., Paris 1: 759 (1888)
    Flora of Tropical East Africa
    • Barink in Meded. Landbouwhogeschool 83 (7): 26–42 (1983)
    • Stapf in F.T.A. 4, 1: 165 (1902)
    • in Bull. Soc. Linn. 1: 759 (1888)

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Flora of Tropical East Africa
    Flora of Tropical East 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 2018. 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 2018. 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