Blooms: July - October
Habit: herb
Duration: perennial
Origin: Native
Distribution: Vancouver Island, British Columbia, and Snohomish County, Washington.
Habitat: Wet places.
Habit: herb
Duration: perennial
Origin: Native
Distribution: Vancouver Island, British Columbia, and Snohomish County, Washington.
Habitat: Wet places.
Species Description:
General: Glabrous annual, the stem 5-10 dm. tall.
Leaves: 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.
Flowers: 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.
Fruits: Achenes wedge-shaped, 5-7 mm. long.
General: Glabrous annual, the stem 5-10 dm. tall.
Leaves: 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.
Flowers: 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.
Fruits: Achenes wedge-shaped, 5-7 mm. long.
Accepted Name:
Bidens amplissima GreeneSynonyms:
Biden cernua L.
Biden cernua L. var. elata Torrey & A. Gray
Bidens elata (Torrey & A. Gray) Sherff
Treated in Flora of the PNW as:
Additional Resources:
PNW Herbaria Specimens: View list of Bidens amplissima specimens in the Consortium of Pacific Northwest Herbaria database.
WTU Herbarium Specimens: View list of Bidens amplissima specimens in the WTU Herbarium database.
Washington Flora Checklist: Bidens amplissima treatment.
E-Flora BC: Bidens amplissima atlas page.
CalPhotos: Bidens amplissima images.
USDA Plants Database: Bidens amplissima.
Wayne C. Weber, 2007
Wayne C. Weber, 2007
Wayne C. Weber, 2007
Wayne C. Weber, 2007
Wayne C. Weber, 2007
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