Ageratum conyzoides L.

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Ageratum conyzoides

Picture: Bart Wursten
Mukuvisi Woodland

Ageratum conyzoides

Picture: Bart Wursten
Old cottages at Katiyo Tea Estate

Ageratum conyzoides

Picture: Bart Wursten
Road down to Nyamuakwarara River, John Meikle Research Station

Ageratum conyzoides

Picture: Bart Wursten
Vumba rd near Essex rd turn off, Vumba

Ageratum conyzoides

Picture: Petra Ballings
Globe Rock, Vumba

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Species details: Click on each item to see an explanation of that item (Note: opens a new window)

Synonyms: Ageratum conyzoides L. subsp. conyzoides
Common names:
Status: Introduced
Annual herb, 10-60 cm. Leaves: base usually blunt or rounded, rarely cordate. Florets blue or white. Phyllaries 3-4 mm, oblong, abruptly acuminate, sparingly if at all hairy on the back, erose and ciliate. Style arms exserted 1 mm from corolla tube.
Type location:
Derivation of specific name: conyzoides: resembling the genus Conyza.
Habitat: Disturbed places, abandoned cultivation, open woodland and along streams and seepage zones.
Altitude range: Up to 1700 m
Flowering time:Oct - May
Worldwide distribution: Native to Mexico but now a pantropical introduction.
Zambian distribution (Flora Zambesiaca): N,W,C,S
Zambian distribution (Provinces): Lk,W
Growth form(s):
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Baumann, G. (2005). Photographic Guide to Wildflowers of Malawi Wildlife and Environmental Society of Malawi Pages 166 - 167. (Includes a picture).

Beentje, H.J. & Ghazanfar, S.A. (eds.) (2005). Compositae (Part 3) Flora of Tropical East Africa Pages 827 - 829. (Includes a picture).

Burrows, J.E. & Willis, C.K. (eds) (2005). Plants of the Nyika Plateau Southern African Botanical Diversity Network Report No. 31 SABONET, Pretoria Page 78. (Includes a picture).

Chapano, C. & Mamuto, M. (2003). Plants of the Chimanimani District National Herbarium and Botanic Garden, Zimbabwe Page 3.

Da Silva, M.C., Izidine, S. & Amude, A.B. (2004). A preliminary checklist of the vascular plants of Mozambique. Southern African Botanical Diversity Network Report No. 30 Sabonet, Pretoria Page 146.

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 23.

Phiri, P.S.M. (2005). A Checklist of Zambian Vascular Plants Southern African Botanical Diversity Network Report No. 32 Page 27.

Pickering, H. & Roe, E. (2009). Wild Flowers of the Victoria Falls Area Helen Pickering, London Page 32. (Includes a picture).

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 30.

Strugnell, A.M. (2006). A Checklist of the Spermatophytes of Mount Mulanje, Malawi Scripta Botanica Belgica 34 National Botanic Garden of Belgium Page 50.

Timberlake, J.R. & Childes, S.L. (2004). Biodiversity of the Four Corners Area: Technical Reviews Volume Two (Chapter 5-15) Appendix 5-1: Plant Checklist Occasional Publications in Biodiversity 15 Page 198.

Vernon, R. (1983). Field Guide to Important Arable Weeds of Zambia Dept. of Agriculture, Chilanga, Zambia Pages 80 - 81. (Includes a picture).

Wild, H. (1955). Common Rhodesian Weeds Government of Rhodesia, Salisbury Page 62. (Includes a picture).

Wursten, B., Timberlake, J. & Darbyshire, I. (2017). The Chimanimani Mountains: an updated checklist. Kirkia 19(1) Page 88.

Other sources of information about Ageratum conyzoides:

Our websites:

Flora of Botswana: Ageratum conyzoides
Flora of Caprivi: Ageratum conyzoides
Flora of Caprivi: cultivated Ageratum conyzoides
Flora of Malawi: Ageratum conyzoides
Flora of Mozambique: Ageratum conyzoides
Flora of Zimbabwe: Ageratum conyzoides

External websites:

African Plants: A Photo Guide (Senckenberg): Ageratum conyzoides
African Plant Database: Ageratum conyzoides
BHL (Biodiversity Heritage Library): Ageratum conyzoides
EOL (Encyclopedia of Life): Ageratum conyzoides
GBIF (Global Biodiversity Information Facility): Ageratum conyzoides
Google: Web - Images - Scholar
iNaturalist: Ageratum conyzoides
IPNI (International Plant Names Index): Ageratum conyzoides
JSTOR Plant Science: Ageratum conyzoides
Mansfeld World Database of Agricultural and Horticultural Crops: Ageratum conyzoides
Plants of the World Online: Ageratum conyzoides
Tropicos: Ageratum conyzoides
Wikipedia: Ageratum conyzoides

Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-24

Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A. (2024). Flora of Zambia: Species information: Ageratum conyzoides., retrieved 18 July 2024

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