Prenanthes nana (Bigelow) Torr.
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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 - Plant 1-4 dm, glabrous, or the lvs occasionally hairy on the midrib and main veins beneath; lvs pale beneath, the lower long-petiolate, deeply few-lobed, the others becoming short-petiolate or subsessile and merely toothed; infl narrow and usually elongate, somewhat thyrsoid, the heads nodding; invol 8-13 mm, blackish-green or black, the pigment spots minute and usually crowded, generally resolvable into scarcely elongate papillae at 50×; principal bracts (7)8(-10), glabrous, the reduced outer ones varying from calyculate as in no. 5 [Prenanthes trifoliolata (Cass.) Fernald] to longer as in no. 7 [Prenanthes boottii (DC.) A. Gray]; achenes ribbed-striate; fls 9-12, ochroleucous; pappus stramineous; 2n=16. Alpine sites; n. N.Y. to Nf. July, Aug. (P. trifoliolata var. n.)
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Common Names
dwarf cut-leaf white lettuce