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This genus is accepted, and its native range is NE. Tropical Africa to Kenya, Arabian Peninsula.
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
Erect or clump-forming stem succulents.
Morphology General Exudate
Latex copious, colourless but usually turning white when dry.
Morphology Stem
Stems pale green, cylindrical, 4-angled; surface often with pungent smell
Morphology Leaves
Leaf rudiments minute, persistent or caducuous, ciliate; stipules reduced to hairs or absent
Morphology Reproductive morphology Inflorescences
Inflorescences occasionally (sub-)axillary, 1–2- or 5–15flowered, sessile
Morphology Reproductive morphology Flowers Corolla
Corolla rotate or campanulate, fused for about half of length, occasionally warty, rugose or papillose; corolla lobes triangular
Morphology Reproductive morphology Flowers Corona
Gynostegial corona in 2 series: “outer” corona of 5 staminal and 5 interstaminal parts fused to half of length, cyathiform or tubular (barrel-shaped), yellow or purplishred; interstaminal corona lobes erect or reflexed, bilobed, occasionally ciliate; “inner” staminal corona lobes lingulate or triangular, inflexed Corolline corona absent
Morphology Reproductive morphology Fruits
Mericarps fusiform or narrowly oblong, up to 10 cm long, occasionally winged
Morphology Reproductive morphology Seeds
Seeds broadly winged

[FSOM]

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

Morphology General Habit
Succulent herbs from a single primary stem, intricately branched and forming compact clumps
Morphology Stem
Stems 4-angled with rounded angles, somewhat tapering towards the tip, not rooting adventitiously, with low, rounded marginal tubercles; latex clear, with peculiar pungent smell
Morphology Leaves
Leaves minute, soon caducous
Morphology Reproductive morphology Flowers
Flowers axillary near tips of stems, single or sometimes paired, large
Morphology Reproductive morphology Flowers Corolla
Corolla campanulate, glabrous
Morphology Reproductive morphology Flowers Corona
Corona gynostegial; outer corona-lobes very deeply divided; inner corona-lobes leaning on anthers
Morphology Reproductive morphology Fruits
Follicles fusiform, rather stout with pointed tip, erect
Morphology Reproductive morphology Seeds
Seeds with a tuft of hairs at one end.

Doubtfully present in:

Djibouti

Native to:

Ethiopia, Kenya, Oman, Saudi Arabia, Socotra, Somalia, Yemen

Monolluma Plowes appears in other Kew resources:

First published in Haseltonia 3: 64 (1995)

Accepted by

  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.

Literature

Flora of Tropical East Africa

  • Haseltonia 3: 64 (1995)
  • Pl. Syst. Evol. 234: 172–209 (2002)

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