Page authors: Don Knoke, David Giblin
Bidens amplissima
Vancouver Island beggar-ticks

Distribution: Occurring west of the Cascades crest in the northern Puget Trough area in Washington; southwestern British Columbia to King County, Washington.

Habitat: Wetlands, estuaries, pond and stream margins.

Flowers: July-October

Origin: Native

Growth Duration: Perennial

Conservation Status: Review Group 1 in Washington (WANHP)


Glabrous annual, the stem 5-10 dm. tall.


Leaves opposite, simple, sessile, or the lower with a short, winged petiole, 8-20 cm. long, the middle and lower leaves deeply three-parted, the divisions deeply toothed or incised.


Heads few and large, the involucre bracts in two series, the outer bracts 8-10, spreading, enlarged and leafy; rays yellow, 8-11, 4-8 mm. long; disk flowers perfect; receptacle flat, chaffy; pappus usually of two awns.


Achenes wedge-shaped, 5-7 mm. long.

Accepted Name:
Bidens amplissima Greene
Publication: Pittonia. 4: 268. 1901.

Synonyms & Misapplications:
Biden cernua L. var. elata Torr. & A. Gray
Bidens elata (Torr. & A. Gray) Sherff
Additional Resources:

PNW Herbaria: Specimen records of Bidens amplissima in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Bidens amplissima checklist entry.

E-Flora BC: Bidens amplissima atlas page.

CalPhotos: Bidens amplissima photos.

USDA Plants: Bidens amplissima information.

6 photographs:
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