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

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Synonyms: Ageratum conyzoides L. subsp. houstonianum (Mill.) Sahu
Ageratum mexicanum Sims
Common names: Floss flower (English)
Frequency: Occasional
Status: Introduced
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.
Notes: A. houstonianum is a more garden-worthy plant than A. conyzoides, with larger and more strongly coloured capitula. Although it is generally easy to separate these two species from general appearance, it is not so easy to devise reliable and unambiguous key characters.
Derivation of specific name:
Habitat: Roadsides, areas of disturbed ground and by streams.
Altitude range: (metres) 1070 - 1660 m
Flowering time:Oct - May
Worldwide distribution: Native of Mexico but also a pantropical weed.
Zimbabwe distribution: C,E
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
Images last updated: Saturday 24 September 2005

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).

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).


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Other sources of information about Ageratum houstonianum:

Our websites:

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

External websites:

African Plant Database: Ageratum houstonianum
Biodiversity Explorer (Biodiversity of southern Africa): Ageratum houstonianum
EOL (Encyclopedia of Life): Ageratum houstonianum
ePIC (electronic Plant Information Center): Ageratum houstonianum
Flora Zambesiaca web site: Ageratum houstonianum
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network) taxonomy for plants report for Ageratum houstonianum
IPNI (International Plant Names Index): Ageratum houstonianum
Ispot Southern Africa : Ageratum houstonianum
JSTOR Plant Science: Ageratum houstonianum
Kew Herbarium catalogue: Ageratum houstonianum
Tropicos: Ageratum houstonianum
West African Plants database: Ageratum houstonianum

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-16

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2016). Flora of Zimbabwe: Species information: Ageratum houstonianum., retrieved 31 May 2016

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