Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
3. Bidens L. -- Beggarticks
5. Bidens coronata (L.) Britt. -- Tickseed sunflower
Glabrous annual (possibly partly biennial) 3-15 dm tall, rather strict to widely
branched, the stems often purplish. Leaves pinnately divided into 3-7(9)
narrow leaflets, short-petioled, to 15 cm long in overall length; leaflets
linear to linear-lanceolate, entire to coarsely toothed or pinnately incised.
Heads radiate, showy, the disk 8-15 mm across; outer involucral bracts
6-8(11), linear to linear-spatulate, to 10 mm long, short-hairy on the margins;
inner involucral bracts shorter; rays bright golden-yellow, 1-2.5
cm long. Achenes with a pappus of 2 apical teeth or short awns, these
antrorsely hispid or barbed, the body brown, cuneate-oblong or the inner ones
longer, cuneate-linear, up to 9 mm long, antrorsely hispid on the margins. Sep--Oct.
Shores, stream banks, marshes, floodplains and sand bars; frequent in extreme
s SD and c NE, especially in the Sand Hills; (MA and s Ont. to MN and SD, s
to GA, KY, IA and NE).
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