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This genus is accepted, and its native range is Congo to Tanzania and S. 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
Shrub or tree with white or yellow latex.
Morphology Stem
Branchlets usually dotted with paler lenticels.
Morphology Leaves
Leaves opposite or rarely subopposite, those of a pair equal, often fairly long-petiolate.
Morphology Reproductive morphology Inflorescences
Inflorescence thyrsoid, terminal and in axils of the upper leaves, lax to congested; bracts obscure.
Morphology Reproductive morphology Flowers
Flowers actinomorphic except for the sometimes slightly unequal sepals.
Morphology Reproductive morphology Flowers Calyx
Sepals ovate, acute, connate at the base.
Morphology Reproductive morphology Flowers Corolla
Corolla hypocrateriform; tube usually much longer than the calyx, nearly cylindrical, ventricose in the upper half and constricted at the mouth, inside velutinous to sericeous except for the glabrous base; lobes narrowly oblong or narrowly obovate, inside at the base pilose or sericeous, overlapping to the left in bud, spreading.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens included; inserted near the middle of the corolla tube; filaments filiform, much widened at the apex; anthers triangular, completely fertile, mucronate, sagittate at the base.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary of two basally connate carpels; 4 ovules on an adaxial placenta in each carpel; clavuncula subcylindrical.
Morphology Reproductive morphology Fruits
Fruit composed of two obliquely oblong follicles, outside dotted with many paler lenticels, dehiscent at the adaxial side.
Morphology Reproductive morphology Seeds
Seeds laterally compressed, obliquely oblong, long-winged at the apex; wings of the two outer seeds directed towards the base and those of the two central seeds towards the apex of the fruit.

[FTEA]

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

Morphology General Habit
Trees or shrubs, sometimes lianas, with white or yellow sticky latex
Morphology Leaves
Leaves (sub-) opposite
Morphology Reproductive morphology Inflorescences
Inflorescence terminal or in the axils of upper leaves, thyrsoid, lax to congested
Morphology Reproductive morphology Flowers
Flowers fragrant, actinomorphic except for the slightly unequal sepals
Morphology Reproductive morphology Flowers Corolla
Corolla salver-shaped; tube with a subcampanulate upper and a cylindrical narrower basal portion, constricted at the throat; lobes overlapping to the left, with corona at the base;
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens included; anthers completely fertile
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary of two free carpels, coherent at the base, placentation parietal, ovules 4 in each carpel; pistil head with a pubescent, basal stigmatic subcylindrical part and a bifid stigmoid apex
Morphology Reproductive morphology Fruits
Fruits composed of two woody follicles, coherent at the base, 4-seeded
Morphology Reproductive morphology Seeds
Seeds compressed, obliquely oblong, dorsal side straight, ventral side abruptly curved, long-winged at apex.

Native to:

Angola, Botswana, Caprivi Strip, Congo, Malawi, Mozambique, Namibia, Northern Provinces, Tanzania, Zambia, Zaïre

Diplorhynchus Welw. ex Ficalho & Hiern appears in other Kew resources:

First published in Trans. Linn. Soc. London, Bot. 2: 22 (1881)

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 Zambesiaca

  • in Trans. Linn. Soc., Ser. 2, Bot. 2: 22 (1881).

Flora of Tropical East Africa

  • Plaizier in Meded. Landbouwhogeschool 80 (12): 28–35 (1980)
  • in Trans. Linn. Soc., Bot. 2, 2: 22 (1881)

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