Burke: Bidens pilosa vs. Bidens amplissima

	Bidens pilosa	Bidens amplissima
		Vancouver Island beggar-ticks
Habit		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.

	Bidens pilosa	Bidens amplissima
Flowering time		July-October
Habitat		Wetlands, estuaries, pond and stream margins.
Distribution	[WildflowerSearch map] [BONAP county map]	Occurring west of the Cascades crest in the northern Puget Trough area in Washington; southwestern British Columbia to King County, Washington. [WildflowerSearch map] [BONAP county map]
Origin		Native
Conservation status		Review Group 1 in Washington (WANHP)
Sibling taxa	B. amplissima, B. beckii, B. cernua, B. connata, B. frondosa, B. tripartita, B. vulgata	B. beckii, B. cernua, B. connata, B. frondosa, B. tripartita, B. vulgata
Web links	Local floras: BC, CA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Bidens pilosa

Bidens amplissima

Vancouver Island beggar-ticks

Habit

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.