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

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology Stem
Stems slightly succulent; latex clear
Morphology Reproductive morphology Flowers Corolla
Corolla-lobes with long slender hairs near base inside
Morphology Reproductive morphology Flowers Corona
Corona gynostegial, of highly fused staminal and interstaminal parts
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium stipitate; lower guide rail entrance papillose; pollinia attached to the caudicles via a dorsal ridge
Morphology Reproductive morphology Fruits
Follicles 1 per flower, elliptic, winged
Morphology Reproductive morphology Seeds
Seeds tuberculate, with a tuft of hairs at one end.
Distribution
Two species in Africa, the widespread S. alatus and the insufficiently known S. gossweileri S. Moore in Angola.

[FTEA]

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

Morphology General Habit
Scandent shrubs or twiners with succulent stems.
Morphology General Exudate
Latex clear or yellowish, not milky
Morphology Leaves
Leaves opposite
Morphology Reproductive morphology Inflorescences
Inflorescences extra-axillary, many-flowered, with the flowers scattered along an indeterminate axis
Morphology Reproductive morphology Flowers Corolla
Corolla rotate, the lobes fused basally
Morphology Reproductive morphology Flowers Corona
Corolline corona absent Gynostegial corona fused for most of its length into a tube surrounding and obscuring the gynostegium
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium stipitate
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther connectives with apical appendages
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria with a pair of pendent pollinia
Morphology Reproductive morphology Flowers Gynoecium Style
Apex of stylar head flat
Morphology Reproductive morphology Fruits
Follicles paired, or single by abortion, winged longitudinally. Seeds flattened, ovate, with a coma of silky hairs
Note
Two species in tropical Africa. According to evidence presented by Liede in Ann. Missouri Bot. Gard. 88: 657–668 (2001) its affinities lie most closely with Cynanchum and Pentarrhinum.

Native to:

Angola, Eritrea, Ethiopia, Kenya, Malawi, Namibia, Northern Provinces, Somalia, Sudan, Tanzania, Uganda, Zaïre, Zimbabwe

Schizostephanus Hochst. ex Benth. & Hook.f. appears in other Kew resources:

First published in Gen. Pl. 2: 762 (1876)

Accepted by

  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.
  • Hedberg, I., Edwards, S. & Nemomissa, S. (eds.) (2003). Flora of Ethiopia and Eritrea 4(1): 1-352. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.

Literature

Flora of Somalia

  • Flora Somalia, Vol 3, (2006) Author: by S. Liede-Schumann [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • G.P. 2: 762 (1876)
  • J.L.S. 114: 81 (1994)

Flora of Somalia
Flora of Somalia
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