Silphium integrifolium Michx. var. integrifolium
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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
Variety Description - The more hairy phase; peduncles, backs of the invol bracts, and usually also the lower surfaces of the lvs and at least the upper part of the stem velvety or scabrous (most of or all the hairs ca 0.5 mm or less); typically in the tall-grass prairie.