Helianthus laevigatus Torr. & A.Gray
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Asteraceae
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Scientific Name
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Description
Species Description - Fibrous-rooted perennial from a crown or short rhizome; stems 1–2 m, glabrous, often glaucous; lvs firm, essentially glabrous, serrulate to entire, lanceolate to sometimes lance-elliptic or lance-ovate, 6–18 × 1–4 cm, narrowed to a subsessile base or short petiole less than 1 cm; upper lvs alternate; heads rather small, the yellow disk 1–1.5 cm wide; invol bracts subequal or slightly imbricate, lanceolate, acuminate-attenuate, often ciliolate, otherwise glabrous; rays 5–10(–13), 1–2 cm; 2n=68. Mainly on shale-barrens in our range; mts. of Va. and W.Va. to N.C. and S.C. Aug.–Oct. (H. reindutus)
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Common Names
shale-barren sunflower