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Annuals.  Typical height is 3 to 4 feet.

Inflorescences are open, consisting of a few flower heads located at the summits of stems or ends of branches.

Flower heads are radiateRay florets are 8, neuter, yellow.  Disc florets are bisexual and fertile, the corollas yellow-orange.  Involucral bracts are in two series: an inner series of short, yellowish, petal-like bracts, and an outer series of longer, narrower, green, leaf-like bracts.

Basal leaves are usually absent.  Stem leaves are opposite, ovate in overall outline, deeply lobed, the lobes linear to lance-linear and  coarsely toothed.

Cypselae are brown to black, compressed, flat at the summit, narrowing toward the base, the faces sometimes with tuberculi.  The pappus is of 2 very small, minutely barbed awns.

Plants of wet open habitats.  Flowers September to early October.  Introduced in NY.

Similar species:  Bidens aristosa

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