Plants 25-60+ cm. Stems proximally piloso-hirsute (hairs 1-3+ mm), distally stellate-pubescent and stipitate-glandular. Leaves: basal 3-6, cauline (0-)2-3+; blades (often purple-mottled) ± elliptic, 50-110 × 25-45 mm, lengths 1.5-3 times widths, bases rounded to truncate, margins ± dentate, apices ± obtuse (apiculate), abaxial faces piloso-hirsute (hairs 1-3+ mm), adaxial scabrous to piloso-hirsute (hairs 0.5-3 mm). Heads 5-8+ in corymbiform arrays. Peduncles densely stellate-pubescent and stipitate-glandular. Calyculi: bractlets 8-13+. Involucres campanulate to obconic, 8-9 mm. Phyllaries 18-21+, apices ± acuminate, abaxial faces stellate-pubescent and stipitate-glandular. Florets 30-50+; corollas yellow, 12-13(-16) mm. Cypselae columnar, 2.5-3 mm; pappi of 30-40+, stramineous bristles in ± 2 series, 4-5 mm. Flowering Jun. Disturbed sites (fields, openings in woods), thickets; introduced; 0-100+ m; B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que.; Alaska, Conn., Ill., Maine, Mass., Mich., N.H., N.J., N.Y., Pa., Vt.; Europe.

Similar to no. 8 [Hieracium lachenalii C. C. Gmel.], and passing into it; basal lvs with well defined blade, broadly rounded or subtruncate to cordate at base; stem commonly naked or with only 1 or 2 lvs; 2n=27, 36. Native of Europe, sparingly intr. along roadsides and in other waste places from N.S. and Que. to N.Y. and N.J., and reportedly w. to Mich. June, July.

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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