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Perennials.  Colony-forming from rhizomes.  Stems pubescent with rough, stiff hairs.  Typical height 5 to 6+ feet.

Overall inflorescences openFlower heads several per stem, borne on long peduncles.

Flower heads are radiateRay florets 10-20+, yellow, neuterDisc florets are bisexual and fertile; corollas yellow.  Receptacles are flat to slightly convex.  Involucral bracts are long, dark green, surpassing the disc, basally appressed, apically spreading/recurved.

Basal leaves are absent at flowering.  Leaves are opposite or alternate, tapering to winged petioles (up to 8 cm in lower leaves), lanceolate to lance-ovate, with 3 prominent main veins, and lower surfaces that are pubescent and gland-dotted.

Plants of thickets, roadsides and other open, disturbed areas, often damp.  Flowers September to October.  Not native.

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Similar species:  Helianthus decapetalus, Helianthus xlaetiflorus, Heliopsis helianthoides, Silphium perfoliatum.

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