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This genus is accepted, and its native range is Tropical & Subtropical America.
Ageratum houstonianum

[FSOM]

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

Morphology General Habit
Annual or perennial herbs or subshrubs
Morphology Leaves
Leaves usually opposite, with large glandular punctations on the lower surface
Morphology Reproductive morphology Inflorescences
Capitula in corymbs
Morphology Reproductive morphology Inflorescences Bracts Involucre
Involucre in 1–2 rows, the phyllaries hardened
Morphology Reproductive morphology Flowers Florets
Florets all similar, with papillose lobes and elongated stigmas
Morphology Reproductive morphology Fruits
Achenes 4–5-angled; pappus of 5–6 awned scales.
Distribution
About 40 species in Central and South America, some widely cultivated and weedy.

[FTEA]

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

Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers short with ovate apical appendages.
Morphology Reproductive morphology Flowers Gynoecium Style
Style-arms clavate, papillate
Morphology Reproductive morphology Fruits
Achenes black, oblong, 5-ribbed, with short setae on the ribs; carpopodium large, white, asymmetrical; pappus of ± 5 awned scales, or reduced, awnless and occasionally absent.
Morphology General Habit
Annuals or short-lived sub-shrubby perennials
Morphology Leaves
Leaves opposite or sub-opposite apically, glandular-punctate beneath
Morphology Reproductive morphology Inflorescences
Inflorescence of loose to dense terminal corymbs
Morphology Reproductive morphology Inflorescences Bracts Involucre
Involucre campanulate; phyllaries bi-seriate, equal; receptacle broadly conical, epaleate
Morphology Reproductive morphology Flowers Corolla
Corollas tubular to funnel-shaped, tube externally glandular-stipitate, 5-lobed.

Native to:

Arizona, Belize, Bolivia, Brazil North, Brazil Northeast, Brazil Southeast, Brazil West-Central, Cayman Is., Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Florida, Guatemala, Honduras, Kenya, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, New Mexico, Nicaragua, Panamá, Texas, Venezuela, West Himalaya

Introduced into:

Alabama, Andaman Is., Angola, Argentina Northeast, Argentina Northwest, Assam, Azores, Bahamas, Bangladesh, Belarus, Belgium, Benin, Botswana, Brazil South, Bulgaria, Burkina, California, Cambodia, Cameroon, Canary Is., Cape Provinces, Cape Verde, Caroline Is., Central African Repu, Chad, Chagos Archipelago, China North-Central, China South-Central, China Southeast, Christmas I., Comoros, Congo, Connecticut, Cook Is., East Himalaya, Egypt, Ethiopia, Fiji, France, French Guiana, Gabon, Georgia, Germany, Great Britain, Guinea-Bissau, Gulf of Guinea Is., Guyana, Hainan, Haiti, Hawaii, Hungary, India, Italy, Ivory Coast, Jamaica, Jawa, Kazakhstan, Kazan-retto, Kentucky, Korea, Krym, KwaZulu-Natal, Laccadive Is., Laos, Leeward Is., Madagascar, Madeira, Malaya, Maldives, Mali, Marianas, Marquesas, Marshall Is., Maryland, Massachusetts, Mauritania, Mauritius, Mississippi, Missouri, Mozambique, Myanmar, Nansei-shoto, Nepal, New Caledonia, New South Wales, New York, Nicobar Is., Niue, Norfolk Is., North Carolina, Northern Provinces, Northern Territory, Ogasawara-shoto, Oman, Pakistan, Palestine, Paraguay, Peru, Philippines, Poland, Portugal, Primorye, Puerto Rico, Queensland, Rodrigues, Réunion, Samoa, Saudi Arabia, Senegal, Seychelles, Society Is., Socotra, South Carolina, South China Sea, Sri Lanka, Sudan, Sumatera, Suriname, Swaziland, Taiwan, Thailand, Togo, Tonga, Transcaucasus, Trinidad-Tobago, Tuamotu, Tubuai Is., Turkmenistan, Turks-Caicos Is., Ukraine, Uruguay, Uzbekistan, Venezuelan Antilles, Vietnam, Windward Is., Yugoslavia, Zambia, Zaïre, Zimbabwe

Ageratum L. appears in other Kew resources:

First published in Sp. Pl.: 839 (1753)

Accepted by

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

Literature

Flora of West Tropical Africa

  • —F.T.A. 3: 300.

Flora of Somalia

  • Flora Somalia, Vol 2, (1999) Author: by R.M. Polhill & D. Wiens [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • Bremer et al. in Asterac., Clad. & Class.: 649 (1994)
  • M.F. Johnson in Ann. Missouri Bot. Gard. 58(1): 6 (1971)
  • R.M. King & H. Rob., Genera of the Eupatorieae: 142 (1987)
  • Sp. Pl.: 839 (1753)
  • V.S. Sharma in F.R. 98: 557 (1987)

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