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Family: Asteraceae
wall-lettuce
[Mycelis muralis (L.) Dum.] |
Leaf blades 35-120(-180+) × 10-50(-80+) mm. Peduncles filiform, 5-25+ mm. Involucres 7-11+ mm. Phyllaries: abaxial faces glabrous. Cypselae: bodies 2.5-3 mm, beaks 0.5-1 mm; pappi: outer 0.1-0.2 mm, inner 5-6 mm. 2n = 18. Flowering Jun-Oct. Disturbed sites, openings in mixed forests, calcareous or sandy soils; 10-400 m; introduced; B.C., Ont., Que.; Maine, Mass., Mich., Minn., N.H., N.Y., Oreg., Vt., Wash.; Europe. 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 נ3-8 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.)
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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