Bidens aristosa|showy beggar-ticks|Asteraceae

Bidens aristosa.Rick Mark.www.usi.edu (Accessed 12/2014).

Bidens aristosa is an annual or biennial herb 30-150 cm tall.

Leaves opposite, pinnately divided, 5-15 cm long including stalk 1-3 cm , leaf segments linear, toothed or lobed.

Flowers: ray flowers about 8, yellow, 1-2.5 cm long, disk 0.8-1.5 cm wide, basal bracts of flower head linear, 0.5-1 cm long, outer bracts shorter than inner bracts.

Fruit dry, 1-seeded (achene), flat 0.5-0.7 cm long, margins slightly winged, fringed with hairs, usually topped by 2 barbed awns; blooming and fruiting Aug-Nov.

Wetland status: FACW-.

Frequency in NYC: Very infrequent.

Origin: Midwestern USA.

Habitat: Partly shady sites in moist to wet soil, pH 5-7 (USDA 2006).

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Bidens aristosa showy beggar-ticks Asteraceae BIAR*; Bx, pb (DeCandido 2001); R (DeCandido 2001);