Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
A strong perennial with densely white-hairy lvs to 12 נ3 mm, and fls ca 2 mm, has been reported as an introduction (from Europe) on Assateague I. in Md.
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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