Ageratum houstonianum Mill

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Ageratum houstonianum

Photo: Bart Wursten
Vumba Rd, nr Mountain Lodge

Ageratum houstonianum

Photo: Bart Wursten
By road from Swynnerton Memorial to main road, Chirinda Forest

Ageratum houstonianum

Photo: Mark Hyde
By Mukuvisi River, Mukuvisi Woodlands, Harare

Ageratum houstonianum

Photo: Mark Hyde
By Mukuvisi River, Mukuvisi Woodlands, Harare

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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. houstonianum (Mill.) Sahu
Ageratum mexicanum Sims
Common names: Floss flower (English)
Frequency: Locally abundant
Status: Introduced and naturalised
Annual herb, 10-60 cm. Leaves: base usually cordate. Florets purple, occasionally pale lilac to white. Phyllaries 4-5 mm, linear-lanceolate, attenuate, entire, ciliate, the back densely glandular-hairy. Style arms exserted 2 mm or more from corolla tube.
Derivation of specific name:
Habitat: Roadsides, areas of disturbed ground and by streams.
Altitude range:
Flowering time:Oct - May
Worldwide distribution: Native of Mexico but also a pantropical weed.
Malawi distribution: N
Growth form(s):
Endemic status:
Red data list status:
Insects associated with this species: Hypolimnas misippus (Food plant)
Spot characters: Display spot characters for this species

Beentje, H.J. & Ghazanfar, S.A. (eds.) (2005). Compositae (Part 3) Flora of Tropical East Africa Pages 828 - 832. (Includes a picture).

Fabian, A. & Germishuizen, G. (1997). Wild Flowers of Northern South Africa. Fernwood Press, Vlaeburg. Page 436. (Includes a picture).

Henderson, L. (2001). Alien weeds and invasive plants Plant Protection Research Institute Handbook No. 12. Plant Protection Research Institute, Agricultural Research Council, South Africa. Page 39. (Includes a picture).

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.

Pooley, E. (1998). A Field Guide to the Wild Flowers of KwaZulu-Natal and the Eastern Region. Natal Flora Publications Trust. Durban. Page 498. (Includes a picture).

Other sources of information about Ageratum houstonianum:

Our websites:

Flora of Caprivi: cultivated Ageratum houstonianum
Flora of Mozambique: Ageratum houstonianum
Flora of Zambia: Ageratum houstonianum
Flora of Zimbabwe: Ageratum houstonianum
Flora of Zimbabwe: cultivated Ageratum houstonianum

External websites:

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

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2014-23

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2023). Flora of Malawi: Species information: Ageratum houstonianum., retrieved 9 December 2023

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