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This genus is accepted, and its native range is Mexico to Tropical America.
Tridax procumbens

[FSOM]

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

Distribution
Some 30 species in tropical America, one a pantropical weed.
Morphology General Habit
Annual or perennial herbs
Morphology Leaves
Leaves opposite, rarely alternate near inflorescence
Morphology Reproductive morphology Inflorescences Capitulum
Capitula solitary or in panicles, discoid or radiate, heterogamous; phyllaries 1–5‑seriate
Morphology Reproductive morphology Flowers Receptacle
Receptacle paleate
Morphology Reproductive morphology Flowers Florets
Ray florets pistillate, fertile, ± 2-lipped, paleae partly enclosing achene
Morphology Reproductive morphology Flowers Disc
Disk florets bisexual, fertile
Morphology Reproductive morphology Flowers Corolla
Corolla cylindric, 5‑lobed
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers sagittate at base
Morphology Reproductive morphology Flowers Gynoecium Style
Style bifurcate
Morphology Reproductive morphology Fruits
Achenes black, often recurved near edge of heads
Morphology Reproductive morphology Seeds Pappus
Pappus of scales and/or slender bristles, rarely absent.

[FTEA]

Compositae, H. Beentje, C. Jeffrey & D.J.N. Hind. Flora of Tropical East Africa. 2005

Morphology General Habit
Annual or perennial herbs
Morphology Leaves
Leaves opposite (or alternate in non-weedy species)
Morphology Reproductive morphology Inflorescences Capitulum
Capitula terminal, solitary on long stalks (or paniculate in non-weedy species), radiate or discoid; involucre 1–5-seriate; paleae linear and keeled
Morphology Reproductive morphology Flowers Florets
Ray florets female; disc florets hermaphrodite, cylindric; anthers with sagittate base and terminal appendage; style arms linear, pubescent, style-base with globose swelling
Morphology Reproductive morphology Fruits
Achenes with pappus of many plumose bristles.

Native to:

Argentina Northeast, Argentina Northwest, Aruba, Bahamas, Belize, Bolivia, Brazil South, Cayman Is., Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Haiti, Jamaica, Leeward Is., Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Netherlands Antilles, Nicaragua, Panamá, Peru, Puerto Rico, Trinidad-Tobago, Venezuela, Windward Is.

Introduced into:

Andaman Is., Assam, Bangladesh, Benin, Botswana, Burkina, Cambodia, Cameroon, Cape Verde, Caroline Is., Chad, Chagos Archipelago, China Southeast, Christmas I., Cocos (Keeling) Is., Comoros, Congo, East Himalaya, Eritrea, Ethiopia, Fiji, Florida, Gabon, Gilbert Is., Gulf of Guinea Is., Hainan, Hawaii, India, Ivory Coast, Japan, Kazan-retto, KwaZulu-Natal, Laccadive Is., Laos, Line Is., Madagascar, Malaya, Maldives, Mali, Marianas, Marquesas, Marshall Is., Mauritius, Mozambique, Myanmar, Nauru, Nepal, New Caledonia, New Guinea, New South Wales, Nicobar Is., Northern Provinces, Northern Territory, Ogasawara-shoto, Pakistan, Philippines, Phoenix Is., Queensland, Rodrigues, Réunion, Seychelles, Society Is., South China Sea, Sri Lanka, Sudan, Swaziland, Taiwan, Texas, Thailand, Togo, Vietnam, Western Australia, Yemen, Zambia, Zaïre, Zimbabwe

Tridax L. appears in other Kew resources:

First published in Sp. Pl.: 900 (1753)

Accepted by

  • Roskov Y. & al. (eds.) (2018). Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.

Literature

Flora of West Tropical Africa

  • —Benth. & Hook. f. Gen. Pl. 2: 392.

Flora of Somalia

  • Flora Somalia, (2000) Author: by H. Beentje [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • Gen. Pl. ed. 5: 382 (1754)
  • Sp. Pl.: 900 (1753)

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