E-Flora BC: Electronic Atlas of the Flora of British Columbia

Bidens tripartita L.
three-parted beggarticks (threelobe beggarticks)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Judith Holm  Email the photographer   (Photo ID #69067)

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Distribution of Bidens tripartita
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Species Information

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Annual herb from a fibrous root; stems erect, simple or branched, 20-100 cm tall.
Basal leaves lacking; stem leaves simple, or lowermost mostly lobed at the base, deeply incised or 3-lobed, saw-toothed, up to 20 cm long; stalks short, wing-margined.
Heads usually discoid; involucres 1-3 cm tall; involucral bracts linear, spreading, outer ones 1-3 cm long, inner ones 7-8 mm long; ray flowers usually lacking; disk flowers about 3 mm long.
Achenes wedge-shaped, outer ones 3.5-4 mm long, 2-3 angled, inner ones 5-8 mm long, 4-angled; barbs of the angles ascending below, reflexed above; pappus awns usually 4, 1-3.6 mm long.
Bidens connata Muhl. ex Willd., native to E North America, has been collected in a cranberry bog in Richmond. It is closely related to B. tripartita.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Summer
Fruit/Seed characteristics:
Colour: Brown
Present over the Fall
Source:  The USDA

Habitat / Range

Moist to wet ditches and ponds in the lowland zone; rare in SW BC, known only from the lower Fraser Valley; introduced from E. North America and Europe.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Bidens acuta (Wieg.) Britt.
Bidens comosa (A. Gray) Wiegand

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References