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This genus is accepted, and its native range is Madagascar, Indian Subcontinent.
Catharanthus roseus (Madagascar periwinkle)

[FZ]

Apocynaceae, A. J. M. Leeuwenberg & F. K. Kupicha et al. Flora Zambesiaca 7:2. 1985

Morphology General Habit
Herbs, perennial or annual, often woody at the base, branched to a varying degree.
Morphology Leaves
Leaves herbaceous to thinly coriaceous, opposite, mucronate, with a fringe or intra- and interpetiolar colleters.
Morphology Reproductive morphology Inflorescences
Inflorescences terminal, but apparently lateral due to pseudomonopodial continuation of the stem by alternating development of one of the axillary buds of the apical pair of leaves, 1–2-flowered.
Morphology Reproductive morphology Flowers
Flowers actinomorphic.
Morphology Reproductive morphology Flowers Calyx
Sepals narrowly to very narrowly oblong, subulate, eglandular.
Morphology Reproductive morphology Flowers Corolla
Corolla purple, red, pink, or white, hypocrateriform; tube laxly puberulous or glabrous, constricted and woolly to velvety at the throat; lobes spreading, obliquely obovate, spiculate.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted at the widest portion of the corolla-tube (usually above the middle); anthers oblong obtuse at the base.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary of two very narrowly oblong carpels; disk composed of two narrowly triangular to narrowly oblong glands, the bases of which touch each other at the abaxial sides of the carpels; style filiform; clavuncula cylindrical, at the base provided with a reflexed hyaline frill; ovules numerous.
Morphology Reproductive morphology Fruits
Fruit composed of two follicles; follicles cylindrical, acute.
Morphology Reproductive morphology Seeds
Seed black, oblong; testa rugose; hilum lateral; cotyledons flat, shorter than the radicle; endosperm scanty.

[FSOM]

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

Morphology General Habit
Perennial or annual herbs or subshrubs; latex white
Morphology Leaves
Leaves opposite; stipules filiform
Morphology Reproductive morphology Flowers
Flowers in 1–2-flowered terminal or seemingly axillary inflorescences
Morphology Reproductive morphology Flowers Calyx
Calyx with narrow lobes
Morphology Reproductive morphology Flowers Corolla
Corolla salver-shaped; lobes mostly obliquely obovate
Morphology Reproductive morphology Flowers Corona
Corona absent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens usually inserted above the middle of the corolla-tube
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary of 2 free narrowly oblong carpels; style with cylindrical head
Morphology Reproductive morphology Fruits
Fruit of 2 cylindrical follicles
Morphology Reproductive morphology Seeds
Seeds oblong, without a tuft of hairs at one end.
Distribution
Genus of nine species, two in India, one of those in Sri Lanka, the others on Madagascar.

Native to:

India, Madagascar, Nepal, Sri Lanka, West Himalaya

Introduced into:

Alabama, Aldabra, Andaman Is., Aruba, Ascension, Assam, Bahamas, Bangladesh, Belize, Benin, Borneo, Burkina, California, Cambodia, Cameroon, Canary Is., Cape Provinces, Cayman Is., Central American Pac, Chad, Chagos Archipelago, China South-Central, China Southeast, Christmas I., Cook Is., Costa Rica, Cuba, Djibouti, Dominican Republic, East Himalaya, Easter Is., El Salvador, Eritrea, Ethiopia, Fiji, Florida, French Guiana, Gabon, Galápagos, Gambia, Gilbert Is., Guatemala, Gulf of Guinea Is., Haiti, Honduras, Italy, Ivory Coast, Jamaica, Jawa, Kazan-retto, Kenya, Kermadec Is., Kriti, Laccadive Is., Leeward Is., Lesser Sunda Is., Malaya, Maldives, Marquesas, Mauritius, Mexico Southeast, Mexico Southwest, Mozambique, Mozambique Channel I, Myanmar, Netherlands Antilles, New Caledonia, New Guinea, Nicaragua, Nicobar Is., Niue, Ogasawara-shoto, Panamá, Philippines, Phoenix Is., Puerto Rico, Queensland, Rodrigues, Réunion, Samoa, Senegal, Seychelles, Sierra Leone, Society Is., South China Sea, Southwest Caribbean, St.Helena, Sumatera, Taiwan, Tanzania, Thailand, Togo, Tokelau-Manihiki, Tonga, Trinidad-Tobago, Tunisia, Turks-Caicos Is., Uganda, Vietnam, Windward Is., Zaïre

Catharanthus G.Don appears in other Kew resources:

First published in Gen. Hist. 4: 95 (1837)

Accepted by

  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.
  • 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 of West Tropical Africa

  • —Pichon in Mém. Mus. Hist. Nat. Paris 27: 237 (1948).

Flora Zambesiaca

  • Codd in Fl. Southern Afr. 26: 267(1963).
  • Gen. Syst. 4: 95 (1837).
  • Markgraf in Fl. Madag., Apocynac.: 140 (1976).
  • Plaizier in Meded. Landb. Wag. 81-9: 2 (1981).

Flora of Somalia

  • Flora Somalia, Vol 3, (2006) Author: by M. Thulin [updated by M. Thulin 2008]
  • Plaizier in Meded. Landbouwhogeschool Wageningen 81-9 (1981)
  • Van Bergen in Wageningen Agric. Univ. Papers 96-3 (1996).

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Somalia
Flora of Somalia
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