Lactuca muralis (L.) Fresen.
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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 - Slender, glabrous annual or biennial 3–10 dm, the lower surfaces of the lvs and often also the stem ± glaucous; basal and lower cauline lvs 6–18 × 3–8 cm, pinnatifid, with a broad, somewhat ivy-like or maple-like terminal segment, tending to be auriculate at base; middle and upper lvs few and much reduced; heads several or usually numerous in a corymbiform or more often paniculiform infl, narrow, with 5 yellow fls; invol merely calyculate, 9–11 mm in fr; achenes 4–5 mm, including the scarcely 1 mm beak, several-nerved on each face; outer row of pappus-bristles shorter than the inner; 2n=18. Moist places; native of n. Europe, now known from Que. and Me. to N.Y., w. to Mich. (Mycelis m.)
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Common Names
wall-lettuce