Plants 5-12(-20+) cm. Stems proximally piloso-hirsute (hairs 2-4+ mm) and stellate-pubescent, distally piloso-hirsute (hairs 1-4 mm), stellate-pubescent, and stipitate-glandular. Leaves: basal 8-12+, cauline 0(-2+); blades spatulate to oblanceolate, 20-45(-130+) × 8-20(-25+) mm, lengths 2-3+ times widths, bases cuneate, margins entire, apices rounded to acute, abaxial faces piloso-hirsute (hairs 1-4+ mm) and stellate-pubescent, adaxial piloso-hirsute (hairs 1-4+ mm). Heads 2-4+ in ± umbelliform to corymbiform arrays. Peduncles piloso-hirsute, stellate-pubescent, and stipitate-glandular. Calyculi: bractlets 13-15+. Involucres hemispheric, (9-)12-13 mm. Phyllaries 30-40, apices acuminate, abaxial faces stellate-pubescent, sometimes, piloso-hirsute and stipitate-glandular as well. Florets 90-120+; corollas yellow (often each with abaxial red stripe), 6-10+ mm. Cypselae columnar, 1-2.5 mm; pappi of 25-40+, white bristles in 1 series, 4-5+ mm. Flowering May. Disturbed sites, roadsides, forest edges; introduced; 10-300(-600+) m; B.C., N.B., N.S., P.E.I., Que.; Conn., Ind., Maine, Mass., Mich., N.H., N.Y., Ohio, Pa., Vt., Va.; Europe. The type of Hieracium flagellare may have resulted from a cross between plants of H. caespitosum and H. pilosella (A. Cronquist 1980).
Vigorously stoloniferous and with a slender, elongate or short and praemorse rhizome, 1.5-4 dm tall, somewhat glaucous; stem nearly naked, pale, finely stellate and with scattered spreading bristles, generally also with some shorter, gland-tipped setae, especially upwards; basal lvs oblanceolate, 3-13 נ0.5-2.5 cm, green and sparsely setose or virtually glabrous above, pale, thinly stellate, and with scattered long setae (especially along the midrib) beneath; heads 2-6, on ±elongate peduncles in an open infl; invol 8-12 mm, inconspicuously stellate, copiously beset with rather short, blackish, gland-tipped setae and often also with some longer glandless ones; 2n=26, 45, 54. A weed in fields and along roadsides, etc.; native of Europe, now sparingly intr. from N.Y. to Que. May, June.
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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