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{{SPlantbox
|genus=Bidens
|species=trichosperma
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Bidens trichosperma, Brit. (Coreopsis trichosperma, Michx.). St. tall, 2-5 ft. high, glabrous, branched above: lvs. pinnatifid: outer involucre about equaling the undotted inner: achenes dark, larger, 2½-4 lines long, cuneate, moderately flat, margin firm, usually pubescent; pappus of 2 upwardly hispid broad-based awns about ½ line long. E. U. S. Var. tenuifolia, Brit. Lf.-segms. narrowly linear: achenes 2-3 lines long.
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Bidens coronata, Fisch. (Coreopsis aurea, Ait.). St. 1-4 ft. high, branched above, glabrous or nearly so: Lvs. ternately or pinnately divided: outer involucre about equaling the dark-dotted inner: achenes dark, very small, 1-2 lines long, narrowly cuneate, 3-angled, margin firm and glabrous; pappus of 2-4 minute awns and some chaff. 8. E. U. S.—Very variable.
Bidens coronata, Fisch. (Coreopsis aurea, Ait.). St. 1-4 ft. high, branched above, glabrous or nearly so: Lvs. ternately or pinnately divided: outer involucre about equaling the dark-dotted inner: achenes dark, very small, 1-2 lines long, narrowly cuneate, 3-angled, margin firm and glabrous; pappus of 2-4 minute awns and some chaff. 8. E. U. S.—Very variable.
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