Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
3. Bidens L. -- Beggarticks
6. Bidens frondosa L.
Erect annual 1.5-8 dm tall, usually branched; stems rather slender, often
purplish, glabrous except slightly villous at upper nodes. Leaves all
or mostly ternate, some larger ones sometimes pinnately divided into 5 leaflets,
the leaflets ovate to lanceolate, glabrous to puberulent above, sparingly
pubescent beneath, acuminate, serrate, the terminal leaflet largest, 3-9 cm
long, 1-3.5 cm wide; petioles 1-4 cm long. Heads discoid, campanulate
to hemispheric, 1-2 cm across; outer involucral bracts 5-10, typically
8, often sparingly ciliate, usually surpassing the disk. Achenes with
2 retrorsely barbed awns, the body dark brown to blackish, 4-9 mm long, antrorsely
appressed-hairy. Late Jul--Oct. Same habitats as B. cernua; common, often
abundant; (Newf. and N.S. to WA, s to GA, LA and CA).
Previous Section -- Bidens coronata (L.) Britt.
-- Tickseed sunflower
Return to Family -- Asteraceae - The
Next Section -- Bidens vulgata Greene