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, 12"-32" tall, smooth forb
Leaves: thin, 3-parted with lance-like, pointed, toothed leaflets on 1/4" - 2 1/3" long stalks
Flowers: head with a brownish to green disk 1/8"-1/3" wide, mostly without rays, 3-5 leafy bracts usually longer than the disk; inflorescence of several small heads; blooms Aug.-Sept.
Fruits: 2- bristly awns with short hairs and serrated edges
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 8, Wetland Indicator = FACW USDA Plants Database: Federal Distribution and detailed information including photos Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key.