Ageratina adenophora (Spreng.) R.M. King & H. Rob.

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Ageratina adenophora

Photo: Bart Wursten
Ballantyne Park, Harare

Ageratina adenophora

Photo: Bart Wursten
Ballantyne Park, Harare

Ageratina adenophora

Photo: Bart Wursten
Haka Game Park, Cleveland Dam

Ageratina adenophora

Photo: Bart Wursten
Haka Game Park, Cleveland Dam

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

Synonyms: Eupatorium adenophorum Spreng.
Common names: Crofton weed (English)
Frequency: Occasional, sometimes locally abundant.
Status: Introduced
Description:
Perennial herb to 1(-2.5) m. Stems reddish-brown and markedly glandular-pubescent, especially above. Leaves opposite: petiole up to 4 cm; lamina up to 10 × 6 cm, ovate or rhombic, dark green above, paler beneath; base cuneate; apex acute to acuminate; margin crenate. Capitula c. 5 × 5 mm, crowded in corymbs. Phyllaries 2-seriate, lanceolate, glandular-pubescent. Flowers white, often appearing in the winter. Achenes c. 2 mm, ± cylindric, smoothly 5-angled. Pappus of numerous scabrid bristles.
Notes: An aggressive weed, causing acute lung disease in grazing horses and skin allergies in humans (Mabberley, 1997).
Said to be cultivated as an ornamental in Maroyi (2006).
Derivation of specific name: adenophora: gland-bearing
Habitat: Well naturalised on roadsides, in open woodland, by marshy ground and along streams, often forming large patches; probably an escape from cultivation.
Altitude range: (metres) 1360 - 1900 m
Flowering time:Aug - Sep
Worldwide distribution: Native of Mexico; c.290 species in the Eastern USA, C and W South America; 2 species naturalised in the Old World.
Zimbabwe distribution: C,E
Growth form(s):
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species
Images last updated: Monday 10 January 2011
Literature:

Beentje, H.J. & Ghazanfar, S.A. (eds.) (2005). Compositae (Part 3) Flora of Tropical East Africa Pages 831 - 833. (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.


Other sources of information about Ageratina adenophora:

Our websites:

Flora of Zambia: Ageratina adenophora
Flora of Zimbabwe: cultivated Ageratina adenophora

External websites:

African Plants: A Photo Guide (Senckenberg): Ageratina adenophora
Biodiversity Explorer (Biodiversity of southern Africa): Ageratina adenophora
BHL (Biodiversity Heritage Library): Ageratina adenophora
EOL (Encyclopedia of Life): Ageratina adenophora
ePIC (electronic Plant Information Center): Ageratina adenophora
Flora Zambesiaca web site: Ageratina adenophora
GBIF (Global Biodiversity Information Facility): Ageratina adenophora
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Ageratina adenophora
IPNI (International Plant Names Index): Ageratina adenophora
Ispot Southern Africa: Ageratina adenophora
JSTOR Plant Science: Ageratina adenophora
Kew Herbarium catalogue: Ageratina adenophora
Mansfeld World Database of Agricultural and Horticultural Crops: Ageratina adenophora
The Plant List (version 1.1): Ageratina adenophora
Tropicos: Ageratina adenophora


Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-19

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2019). Flora of Zimbabwe: Species information: Ageratina adenophora.
https://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=158690, retrieved 23 July 2019

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