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

[FTEA]

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

Morphology General Habit
Climbing shrubs or lianas; white latex present; branchlets (sub-)opposite, terete
Morphology Leaves
Leaves (sub-)opposite; petiole with glands on the adaxial side; domatia in some vein axils, consisting of pits, often with a ciliate margin or of a tuft of hairs
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or axillary, thyrsoid, many-flowered; bracts deciduous
Morphology Reproductive morphology Flowers
Flowers 5-merous, fragrant
Morphology Reproductive morphology Flowers Calyx
Sepals imbricate, ciliate
Morphology Reproductive morphology Flowers Corolla
Corolla tube shortly pubescent outside, inside with tufts of stiff hairs, alternating with the stamens, at the mouth with 5 alternipetalous corona scales; lobes overlapping to the right, entire, recurved
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens included, connivent into a cone; filaments short; anthers partly fertile, below the fertile part inside a nearly oblong patch, the retinacle, with minute hairs along the margin adhering to the pistil head
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary semi-inferior; carpels two, connate at the extreme base, densely pubescent; disk present, adnate to the ovary at the extreme base, composed of a ring and five lobes; pistil head of a slightly 5-winged upper and a cylindrical lower portion to which the 5 retinacles adhere and a bifid stigmoid
Morphology Reproductive morphology Fruits
Fruits pendulous, of two follicles connate at the extreme base, dehiscent along an adaxialline; exocarp woody; endocarp stiff, thinly pergamentaceous
Morphology Reproductive morphology Seeds
Seeds attached to the adaxial side of the fruit, with an apical coma directed towards the apex of the fruit.

[FZ]

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

Morphology General Habit
Scandent shrubs and tall lianes with milky latex.
Morphology General Spines
Spines, tendrils and stipules absent.
Morphology Leaves Petiole
Glands present at or near apex of petiole.
Morphology Leaves
Domatia usually present on lower leaf surface.
Morphology Reproductive morphology Flowers
Flowers in terminal or axillary paniculate cymes, often greenish and inconspicuous.
Morphology Reproductive morphology Flowers Calyx
Calyx lobes imbricate, free almost to base.
Morphology Reproductive morphology Flowers Corolla
Corolla hypocrateriform; tube short, widest at the middle, hairy inside and outside, bearing 5 alternipetalous corona scales at the mouth; corolla lobes 5, contorted, overlapping to the right, spreading to reflexed, ± equalling tube.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted almost at base of corolla tube; anthers large, conniving in a cone round the gynoecium, fertile in the upper part only, joined to the clavuncle by a retinacle (a linear appendage produced from the connective at the base of the anther).
Morphology Reproductive morphology Flowers Receptacle
Receptacular disc cupular, with 5 oppositi-petalous lobes.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary of 2 multiovulate carpels connate at the extreme base only; style very short; clavuncula consisting of a slightly 5-winged upper and a cylindri­cal lower portion, to the latter of which the 5 retinacles adhere; stigma bilobed.
Morphology Reproductive morphology Fruits
Fruit of 2 follicular mericarps.
Morphology Reproductive morphology Seeds
Seeds oblong with an apical coma; endosperm in a thin layer completely surrounding the embryo.

Native to:

Angola, Benin, Burundi, Cabinda, Cameroon, Cape Provinces, Central African Repu, Congo, Equatorial Guinea, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Kenya, KwaZulu-Natal, Liberia, Madagascar, Malawi, Mozambique, Nigeria, Senegal, Sierra Leone, Sudan, Tanzania, Togo, Uganda, Zambia, Zaïre, Zimbabwe

Oncinotis Benth. appears in other Kew resources:

First published in W.J.Hooker, Niger Fl.: 451 (1849)

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: 220.

Flora Zambesiaca

  • Pichon in Mém. Mus. Nation. Hist. Nat. Paris, Sér. B, 1: 1–143 (1950)
  • in Bull. Jard. Bot. Brux. 24: 9–36 (1954).
  • in Hook., Niger Fl.: 451 (1849).

Flora of Tropical East Africa

  • G. P. 2: 718 (1876)
  • Pichon in B.J.B.B. 24: 9–36 (1954)
  • de Kruif in Agric. Univ. Wageningen Papers 85 (2): 8–45 (1985)
  • in Niger Fl.: 451–452 (1849)

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