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

Selected images: Click on each image to see a larger version and details of the record View all images (6)

Photo: Bart Wursten
Ballantyne Park, Harare

Photo: Bart Wursten
Haka Game Park, Cleveland Dam, Harare

Records: Display species records Map species using Google Maps

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)
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
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.
Growth form(s):
Insects associated with this species:
Spot characters:	Display spot characters for this species
Image 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: Ageratina adenophora

External websites:

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