Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
3. Bidens L. -- Beggarticks7. Bidens vulgata Greene
Similar in habit to the preceding; stems pubescent at the nodes and in the upper part. Leaves commonly divided into 3-5, or occasionally 7 leaflets, the leaflets ovate-lanceolate to lanceolate, sometimes incised, puberulent or nearly glabrous above, sparingly pubescent beneath, acuminate, serrate, the terminal leaflet 3-10 cm long, 1-3 cm wide; petioles 1-5 cm long. Heads discoid, averaging larger than in B. frondosa, 1-3 cm across, outer involucral bracts 10-16 or more, typically 13, ciliate. Achenes with 2 retrorsely barbed awns, the body olivaceous to yellowish or occasionally brown, antrorsely appressed-hairy. Aug--Oct. Same habitats as B. cernua; common, especially in the e part; (N.S. to Alta. and WA, s to GA, MO, KS, NV and CA).
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