Page authors: Don Knoke, David Giblin
Bidens cernua
bur marigold, nodding beggar ticks
WTU specimens
Other herbaria

Distribution: Widely distributed throughout much of Washington; widely distributed throughout North America.

Habitat: Stream banks, pond and lake edges, and other wet places at low elevations.

Flowers: July-September

Origin: Native

Conservation Status: Not of concern

Description:
General:

Annual, nearly glabrous throughout, 1-10 dm. tall.

Leaves:

Leaves sessile, simple, lance-linear to lance-ovate, serrate to sub-entire, 4-20 cm. long and 5-45 mm. wide.

Flowers:

Heads hemispheric, the disk 12-25 mm. wide, nodding in age; outer involucral bracts 5-8, lance-linear, leafy and spreading, inner bracts yellowish above; rays 6-8, yellow, up to 1.5 cm. long, or rarely wanting

Fruits:

Achenes narrowly triangular, compressed-quadrangular, 5-8 mm. long, with persistent pappus of four retrorsly-barbed awns.

Identification Notes:

The undivided leaves and large flowering heads with prominent ray flowers readily separates Bidens cernua from the other species of Bidens.

Accepted Name:
Bidens cernua L.
Publication: Sp. Pl. 2: 832. 1753. 1753.

Synonyms & Misapplications:
Bidens cernua L. var. cernua
Bidens cernua L. var. elliptica Wiegand
Bidens cernua L. var. minima (Huds.) Pursh
Additional Resources:

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

WA Flora Checklist: Bidens cernua checklist entry.

E-Flora BC: Bidens cernua atlas page.

CalPhotos: Bidens cernua photos.

USDA Plants: Bidens cernua information.

36 photographs:
Group by