Bidens biternata (Lour.) Merr. & Sherff

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Bidens biternata

Photo: Bart Wursten
Cleveland Dam, area below dam wall

Bidens biternata

Photo: Bart Wursten
Cleveland Dam, area below dam wall

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Synonyms: Bidens cylindrica Sherff
Common names: Yellow-flowered blackjack (English)
Frequency: Frequent
Status: Probably native
Erect annual herb, up to 1 m. It can be distinguished by the leaves, which are usually 5-7 foliolate, the basal pair sometimes further divided. The flowers are yellow, including the ray-florets. In B. pilosa, the leaves are 3-foliolate and the ray-florets, if present, are white. B. biternata is much less frequent in occurrence.
Notes: Believed to be indigenous, this is another weedy species, quite similar to two other weedy aliens Bidens pilosa and to Bidens bipinnata. B. pilosa differs from B. biternata in possessing 3-foliolate leaves and white (or no) ray florets; B. bipinnata differs in the 2-pinnatisect leaves.
Derivation of specific name:
Habitat: A widespread weed of disturbed and cultivated areas.
Altitude range: (metres)
Flowering time:
Worldwide distribution:
Zimbabwe distribution: N,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 26 April 2006

Heath, A. & Heath, R. (2009). Field Guide to the Plants of Northern Botswana including the Okavango Delta Kew Publishing Page 204. (Includes a picture).

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 31.

Strugnell, A.M. (2006). A Checklist of the Spermatophytes of Mount Mulanje, Malawi Scripta Botanica Belgica 34 National Botanic Garden of Belgium Page 51.


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Other sources of information about Bidens biternata:

Our websites:

Flora of Botswana: Bidens biternata
Flora of Malawi: Bidens biternata
Flora of Mozambique: Bidens biternata
Flora of Zambia: Bidens biternata

External websites:

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

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: Bidens biternata., retrieved 31 May 2016

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