UW Burke Herbarium species comparison

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Bidens tripartita

Asteraceae tribe Heliantheae

three-lobed beggar-ticks
Habit Annual, nearly glabrous throughout, 1-20 dm. tall.
Leaves

Leaves simple (but appearing trifoliate), sharply serrate, usually deeply divided into 3 narrow lobes, the center one larger and wider, 3-15 cm. long.

Flowers

Heads erect, rayless, or occasionally with rays up to 4 mm. long; outer involucral bracts 4-9, herbaceous, enlarged and leafy.

Fruits

Achenes wedge-shaped, flat or compressed-quadrangular, brown or blackish to purplish, with persistent pappus of 2-4 awns.

Bidens tripartita

Asteraceae tribe Heliantheae
Identification notes The winged petioles of Bidens tripartita should separate it from the very similar B. frondosa.
Flowering time August-October
Habitat Wet places, often where disturbed, primarily at low elevations.
Distribution
Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast where native.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from Eurasia and eastern North America
Conservation status Not of concern
Sibling taxa
B. amplissima, B. beckii, B. cernua, B. connata, B. frondosa, B. vulgata
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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