Bidens pilosa L.

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Photo: Bart Wursten
Ndundu Lodge, Vumba

Photo: Bart Wursten
Marydale Point Lake Chivero Recreational Park

Photo: Bart Wursten
Near Chalet 2, Chirinda Forest

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

Synonyms:
Common names:	Black-jack (English)
Frequency:	Common
Status:	Introduced
Description:	Annual herb to 1.5 (-2.2) m. Leaves petiolate, (1-)3-foliolate, glabrous or pilose. Terminal leaflet up to 9 × 5 cm, narrowly ovate to ovate-oblong; base cuneate; apex acuminate; margin ciliate, crenate or serrate-crenate; lateral leaflets smaller, asymmetric. Inflorescence laxly corymbose. Capitula up to 1 cm in diameter. Rays 0 (var. pilosa) or creamy-white, 4-7 and up to 1.5 cm, exceeding (var. radiata Sch.Bip.) or not exceeding (var. minor Blume) the phyllaries. Achenes up to 1.6 cm, blackish. Bristles 2-3, retrorsely barbed.
Notes:	An exceptionally tall plant which attained 2.2 metres was recorded by Alistair Hull from his Harare garden. An image of Alistair overtopped by this plant may be found on this page.
Derivation of specific name:	pilosa: pilose, with long soft hairs
Habitat:	In disturbed habitats generally: as a weed of gardens, cultivated and fallow lands and roadsides.
Altitude range: (metres)	1060 - 1660 m
Flowering time:	Sep - May
Worldwide distribution:	Probably originally South American, but very widely naturalised throughout the tropics and subtropics.
Zimbabwe distribution:	N,W,C,E,S
Growth form:	A
Endemic status:
Red data list status:
Insects (whose larvae eat this species):
Spot characters:	Display spot characters for this species
Content last updated:	Monday 1 January 2007
Literature:	Pickering, H. & Roe, E. (2009). Wild Flowers of the Victoria Falls Area Helen Pickering, London Page 33. (Includes a picture).

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Other sources of information about Bidens pilosa:

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