Bidens vulgata Greene
Family: Asteraceae
big devil's beggar-ticks, tall beggar-ticks
Bidens vulgata image
Hugh H. Iltis  
Etymology: Bidens: derived from Latin bis, "twice," and dens, "tooth," hence meaning "2-toothed" and referring to the bristles on the achenes
Plants: erect, annual, 4"-60" tall, smooth to densely hairy forb
Leaves: stalked, 3-5 pinnately-divided into lance-like, toothed, pointed leaflets
Flowers: head usually without rays, disk 1/3"-1/2" wide; 10-20 leafy bracts usually longer than the disk; inflorescence a few long-stalked heads; blooms Aug.-Oct.
Fruits: dark but often yellowish with 2 barbed awns fruit drawing
Habitat: wet to dry; disturbed sites
Conservation Status: Native