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

[FTEA]

Apocynaceae (part 2), David Goyder, Timothy Harris, Siro Masinde, Ulrich Meve, Johan Venter. Flora of Tropical East Africa, 2012

Morphology General Habit
Perennial herbs with annual stems arising from a slender to stout vertical tuber.
Morphology General Exudate
Latex milky.
Morphology Stem
Stems usually simple or branched, erect or ascending
Morphology Leaves
Leaves opposite, subsessile; lamina linear to narrowly oblong
Morphology Reproductive morphology Inflorescences
Inflorescences terminal and extraaxillary, umbels erect, borne on long or short peduncles
Morphology Reproductive morphology Flowers Calyx
Calyx lobed to the base
Morphology Reproductive morphology Flowers Corolla
Corolla deeply lobed, apex of lobes often revolute, much reduced and smaller and less conspicuous than the petaloid corona
Morphology Reproductive morphology Flowers Corona
Corona of 5 petaloid lobes arising above the base of the staminal column; erect and somewhat fleshy, the claw cucullate at least at the base, the inner margins generally produced into a pair of inward- or upwardpointing teeth, with or without a tooth arising from the middle of the cavity, the limb expanded into a flattened oblong to orbicular lobe with entire to dentate margins
Morphology Reproductive morphology Flowers Pollinia
Pollinia pendant in the anther cells. Corpusculum ovoid to subcylindrical, black; translator arms short, broad and differentially thickened.
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Flowers Pedicel
Fruiting pedicel not contorted.
Morphology Reproductive morphology Fruits
Follicles single, erect, ovoid to fusiform
Morphology Reproductive morphology Seeds
Seeds flattened, ovate with a verrucose disc and a narrow inflated rim; coma of silky hairs.
Note
A single, widely distributed species across tropical Africa with eight, regionally localised subspecies.

Native to:

Burundi, Cameroon, Central African Repu, Kenya, Malawi, Mozambique, Nigeria, Rwanda, Sudan, Tanzania, Uganda, Zambia, Zaïre, Zimbabwe

Margaretta Oliv. appears in other Kew resources:

First published in Trans. Linn. Soc. London 29: 111 (1875)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Flora of Tropical East Africa

  • K.B. 60: 87–94 (2005)
  • Trans. Linn. Soc., Bot. 29: 111, t. 76 (1875)

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