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This genus is accepted, and its native range is Tropical & Subtropical Old World to W. Pacific.
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 General Habit
Glabrous or puberulent lianes and twining shrubs; latex white
Morphology Leaves
Leaves opposite, petiolate
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or axillary, in simple or compound cymes
Morphology Reproductive morphology Flowers Corolla
Corolla rotate or campanulate, lobed to halfway or beyond
Morphology Reproductive morphology Flowers Corona
Corolline corona of 5, usually paired, fleshy ridges running from the base of the corolla-tube to the corolla-lobe sinus Staminal corona of 5 laterally compressed or subulate lobes
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria minute, with 4 pollinia attached directly or by extremely short, flattened caudicles to the pale, porous corpusculum
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigmatic head exserted beyond the top of the staminal column or not
Morphology Reproductive morphology Fruits
Follicles paired but sometimes only one developing, smooth or shallowly striate
Morphology Reproductive morphology Seeds
Seeds ovate, compressed, with a tuft of white or ivory hairs.
Distribution
Genus of about 130 species distributed across Africa and Asia, with the centre of diversity in Madagascar and a secondary centre in tropical Africa.

[FTEA]

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

Morphology General Habit
Lianes and twining shrubs with white latex
Morphology General Indumentum
Young shoots and inflorescences glabrous or puberulent
Morphology Leaves
Leaves opposite, petiolate
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or axillary (extra-axillary is the norm in Asclepiadoideae), cymose or composed of an aggregation of cymes
Morphology Reproductive morphology Flowers Calyx
Calyx of 5 ± free, with ciliate margins
Morphology Reproductive morphology Flowers Corolla
Corolla rotate or campanulate, 1–8 mm long, glabrous or hairy on the inner surface, 5-lobed to halfway or beyond.
Morphology Reproductive morphology Flowers Corona
Gynostegial corona staminal, of 5 laterally or more rarely dorsally compressed or subulate lobes Corolline corona present or occasionally absent, formed of 5, usually paired, nonvascularised fleshy ridges running from the base of the corolla tube to the corolla lobe sinus, sometimes extending up the inner face of the corolla lobes or forming a pocket obscuring the sinus
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Staminal filaments entirely free or connate at the base.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers with entire or fimbriate appendages
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria minute, with 4 pollinia attached directly or by extremely short, flattened caudicles to the pale, porous corpusculum
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head appendage terete, lobed or dilated, exserted beyond the top of the staminal column or not
Morphology Reproductive morphology Fruits
Follicles paired but sometimes only one developing, smooth or shallowly striate
Morphology Reproductive morphology Seeds
Seeds ovate, compressed, with a coma of white or ivory hairs.

Native to:

Aldabra, Andaman Is., Angola, Benin, Bismarck Archipelago, Borneo, Botswana, Burkina, Burundi, Cabinda, Cambodia, Cameroon, Cape Provinces, Central African Repu, China South-Central, China Southeast, Comoros, Congo, Ethiopia, Free State, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Gulf of Guinea Is., Hainan, India, Ivory Coast, Jawa, Kenya, KwaZulu-Natal, Laos, Lesser Sunda Is., Liberia, Madagascar, Malawi, Malaya, Mauritius, Mozambique, Myanmar, Namibia, New Caledonia, New Guinea, New South Wales, Nigeria, Northern Provinces, Northern Territory, Philippines, Queensland, Rodrigues, Rwanda, Réunion, Senegal, Seychelles, Sierra Leone, Socotra, Somalia, Sri Lanka, Sudan, Sulawesi, Sumatera, Swaziland, Taiwan, Tanzania, Thailand, Togo, Uganda, Vietnam, Western Australia, Zambia, Zaïre, Zimbabwe

Secamone R.Br. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Mar 1, 2011 Middleton, D.J. et al. [1316], Thailand K000577213
Mar 1, 2011 Middleton, D.J. et al. [1162], Thailand K000577212
Jan 1, 2007 Bardot-Vaucoulon, M. [977], Madagascar K000449310
Jan 1, 2007 Bardot-Vaucoulon, M. [1241], Madagascar K000449309
Jan 1, 1997 Humbert, H. [4886 bis.], Madagascar K000234237 Unknown type material
Lane-Poole, C.E. [335], Sierra Leone 22724.000
Drummond, R.B. [2794], Tanzania 4055.000
Dupuy, D.J. [M 656], Madagascar 63565.000

First published in Prodr. Fl. Nov. Holland.: 464 (1810)

Accepted by

  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.
  • Klackenberg, J. (1992). Taxonomy of Secamone s. lat. (Asclepiadaceae) in the Madagascar Region Opera Botanica 112: 1-127.

Literature

Flora of Somalia

  • Flora Somalia, Vol 3, (2006) Author: by D. Goyder [updated by M. Thulin 2008]
  • Goyder in Kew Bull. 47: 437–474 (1992).

Flora of Tropical East Africa

  • Adansonia 23: 317–335 (2001)
  • K.B. 47: 437–474 (1992);
  • Mem. Wern. Soc. 1: 55 (1809)

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

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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