Bidens bipinnata L.
Linnaeus, C. von (1753) Species Plantarum 2: 832. Type: Habitat in Virginia.
Beggar's Ticks; Beggarticks; Bipinnate Beggar's Ticks
Annual herb, but occasionally reaches a shrub of 1-1.6 m tall.
Flowers borne in heads 5-10 mm diam., 30-40 flowers per head. Outer involucral bracts linear to narrowly lanceolate, not dilated, 3-5(-7) mm long, glabrous or with fine hairs. Inner bracts linear-lanceolate, usually deep purplish brown, glabrous or finely hairy. Ray florets (0)3-5, yellow; ligule 1-2(-3) mm long.
Features not available, but similar to Bidens subalternans.
This species may have some medicinal uses.