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Plants of shorelines, wet meadows as well as drier, disturbed sites (our most common species; becoming weedy).  Flowers late August to late September.  Native..

Annual.  Stems are often branching from near plant base.  Typical height is 3 to 4+ feet.

Inflorescences consist of a few flower heads located at the summit of the stem, at ends of branches in flat- or round-topped clusters, or in leaf axils.

Flower heads are discoid, erect (not nodding) (not nodding)Ray florets are rarely present.  Disc florets are bisexual and fertile, 20-60+ per head; the corollas are yellow-orange, readily falling as fruits mature.  Involucral bracts are in two series: an inner series - which are short, yellowish and petal-like; and an outer series - of 5-10 longer, narrower, green, leaf-like, with ciliate margins.

Basal leaves are absent at flowering.    Primary stem leaves are opposite, borne on petioles, divided into 3-5 lanceolate or lance-ovate leaflets, and coarsely toothed.

Cypselae are dark brown, compressed, flat or concave at the summit, narrowed toward the base, the faces often dotted with minute tuberculesThe pappus is of 2 minutely barbed awns, 2-5 mm long.

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Similar species:  Bidens discoidea.

 

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