Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
3. Bidens L. -- Beggarticks3. Bidens comosa (A. Gray) Wieg.
Simple and erect to branched and spreading annual 1-12 dm tall, glabrous. Leaves simple, oblong-lanceolate to ovate-lanceolate, 3.5-15 cm long, 0.5-5 cm wide, acuminate, shallowly to sharply toothed and scabrous on the margin, sessile or tapered to a winged, subpetiolate base. Heads discoid, broadly campanulate to hemispheric, 1-2.5 cm across, remaining erect after flowering; outer involucral bracts 5-10 or more, often greatly enlarged and much surpassing the disk. Achenes with 3 retrorsely barbed awns, the body reddish-brown to dark brown at maturity, 3.5-7 mm long, retrorsely barbed on the margins. Aug--Oct. Same habitats as B. cernua; frequent; (ME and Que. to MT, s to NC, TN, NM and UT). B. tripartita L., B. acuta (Wieg.) Britt.
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