Parthenium hysterophorus L.

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Parthenium hysterophorus

Photo: Bart Wursten
Old Runde Bridge, Mwenezi

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Synonyms:
Common names: Congress grass (English) Demoina weed (English) Famine weed (English) Feverfew (English) Parthenium (English)
Frequency: Local
Status: Introduced
Description:
Bushy much-branched annual herb to 1 m. Leaves sessile, up to 10 × 5 cm, deeply 2-pinnately lobed with obtuse ultimate segments, densely puberulent below, less so above. Panicle large and lax. Capitula c.3 mm in diameter, hemispheric. Phyllaries in 2 series, 2-3 mm. Rays c.0.5 mm, white, ± circular, 5 per capitulum. Fertile achenes black, c.2 mm, broadly obovoid, flattened, pubescent near apex.
Notes: Although abundantly common in Mozambique this species is still local in Zimbabwe. Not recorded for Zimbabwe in Wild (1967). It was first reported for Zimbabwe from Rainham Dam (R B Drummond, pers. comm.) First noticed by co-author Mark Hyde on the roadside verge in Chancellor Avenue, Harare in c.1990, but not collected until 1993, by which time the species had spread intermittently northwards along Chancellor Avenue as far north as the Veterinary Research establishment and southwards to about 100 m south of Josiah Tongogara Avenue. Further plants had also appeared in Fifth Street extension to the north of Josiah Tongogara Avenue. Since then, the spread of the species outside Harare has been surprisingly slow. The specimen in the image appears to be the first record for the Southern Division.
Derivation of specific name:
Habitat: Roadsides and disturbed places
Altitude range: (metres)
Flowering time:All year
Worldwide distribution: Native of South and Central America; naturalised elsewhere in the tropics
Zimbabwe distribution: W,C,E,S
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: Wednesday 11 November 2015
Literature:

Bandeira, S., Bolnick, D. & Barbosa, F. (2007). Wild Flowers of Southern Mozambique Universidade Eduardo Mondlane, Maputo, Mozambique Page 212. (Includes a picture).

Wild, H. (1967). The Compositae of the Flora Zambesiaca area. 1. Heliantheae. Kirkia 6(1) Pages 8 - 9.


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Other sources of information about Parthenium hysterophorus:

Our websites:

Flora of Mozambique: Parthenium hysterophorus

External websites:

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


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: Parthenium hysterophorus.
http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=160290, retrieved 27 September 2016

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