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This genus is accepted, and its native range is Tropical Africa.
A specimen from Kew's Herbarium

[FZ]

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

Morphology General Habit
Shrubs, lianas or trees up to 9 m. high, with white latex.
Morphology Stem
Branches unarmed, with pale lenticels; branchlets terete, often sulcate when dry.
Morphology 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.
Morphology Reproductive morphology Inflorescences
Inflorescences terminal, paniculate, several- to many-flowered, lax. Lower bracts leafy; others narrowly oblong, acute, with colleters in the axils.
Morphology Reproductive morphology Flowers
Flowers actinomorphic except for the sometimes slightly unequal sepals, small.
Morphology Reproductive morphology Flowers 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).
Morphology Reproductive morphology Flowers 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.
Morphology Reproductive morphology Flowers Androecium 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.
Morphology Reproductive morphology Flowers Gynoecium 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.
Morphology Reproductive morphology Flowers Gynoecium Ovary Ovules
Ovules numerous, in several rows.
Morphology Reproductive morphology Fruits
Follicles 2, spreading, almost free, pendulous, slender, adaxially dehiscent, glabrous; wall thinly coriaceous, striate, grooved when dry, glabrous outside.
Morphology Reproductive morphology 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

Morphology General Habit
Shrubs, lianas or trees with white latex in bark and leaves
Morphology Leaves
Leaves opposite, petiolate, with colleters in one or two rows in the axils
Morphology Reproductive morphology Inflorescences
Inflorescences terminal, paniculate, several- to many-flowered, lax
Morphology Reproductive morphology Flowers
Flowers 5-merous
Morphology Reproductive morphology Flowers Calyx
Sepals persistent in fruit, connate at the base, ciliate, with colleters within
Morphology Reproductive morphology Flowers Corolla
Corolla salver-shaped, ventricose at the middle; lobes contorted in bud, overlapping to the left, inside with 2 sets of appendages
Morphology Reproductive morphology Flowers Androecium 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
Morphology Reproductive morphology Flowers Gynoecium 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
Morphology Reproductive morphology Fruits
Fruits of 2 spreading almost free, pendulous, follicularmericarps, slender, dehiscent; pericarp thin, glabrous
Morphology Reproductive morphology 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.

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)

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 2021. 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 2021. 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