Prenanthes boottii (DC.) 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 - Stem 1–3(–4) dm, glabrous below, villous- puberulent above, at least in the infl; lvs glabrous, pale beneath, entire or merely toothed, the lower with deltoid or cordate blade 1.5–5 × 1–3 cm, exceeded by the petiole; infl narrow, somewhat thyrsoid; heads mostly nodding; invol 8–12 mm, black or blackish-green, the pigment-spots minute, crowded, generally resolvable into short parallel lines at 50×; principal bracts 8–11(–13), minutely puberulent at the tip, otherwise glabrous; some of the reduced outer bracts generally at least half as long as the main ones; fls 9–18, whitish; achenes evidently several-ribbed, but only obscurely striate; 2n=32. Alpine sites; n. N.Y. to Me. July, Aug.
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Common Names
dwarf simple white lettuce