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Helianthus decapetalus - (image 1 of 5)

Taxonomy

Family: Asteraceae

Habitat

Woods and along streams.

Associates

Distribution

ME and Quebec to WI and IA, south to GA and MO.

Morphology

Herbaceous perennial from slender rhizomes; stem 0.5-1.5+ m, glabrous below the short-hairy inflorescence; leaves thin, pale underneath, moderately scabrous to subglabrous, broadly lanceolate to ovate, 8-20 cm long and 3-8 cm wide, long-acuminate, serrate (usually sharply so), more or less abruptly contracted near the base and decurrent onto the 1.5-6 cm petiole; upper leaves usually alternate; disk yellow, 1-2 cm wide; involucral bracts very loose, thin, green, ciliate, sometimes hispidulous on the back, attenuate-acuminate, at least some usually surpassing the disk; rays 8-15, 1.5-3.5 cm.

Notes

Flowers August to October

Wetland indicator: FACU

The specific epithet means 'ten petals'.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

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