Plants 30-90 cm. Stems proximally usually glabrous, sometimes piloso-hirsute (hairs 3-8+ mm) and/or stellate-pubescent, distally usually glabrous. Leaves: basal 0(-2), cauline 6-12+; blades elliptic or oblanceolate to lanceolate, 30-80(-150) × 6-25(-35) mm, lengths 3-6+ times widths, bases cuneate, margins usually toothed, sometimes denticulate or entire, apices acute to acuminate, faces glabrous or piloso-hirsute (hairs 1-4+ mm). Heads (6-)12-50+ in corymbiform to paniculiform arrays. Peduncles usually glabrous, sometimes stipitate-glandular. Calyculi: bractlets 8-13+. Involucres campanulate to cylindric, 6-7 mm. Phyllaries 8-13+, apices acute to acuminate, abaxial faces usually glabrous, sometimes stipitate-glandular. Florets 8-20(-30); corollas ochroleucous to yellow, 5-8 mm. Cypselae columnar, 2-2.5 mm; pappi of 35-40+, stramineous bristles in ± 2 series, 4-5 mm. Flowering (Jul-)Aug(-Oct). Openings in forests; (10-)500-800 m; N.B., N.S., Ont., Que.; Ala., Conn., Del., Ga., Ind., Ky., Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va. The type of Hieracium scribneri Small may have resulted from a cross between plants of H. paniculatum and H. venosum (A. Cronquist 1980).
Stems solitary (2) from a short caudex or crown, 3-15 dm, long-hairy below, otherwise glabrous or nearly so, leafy up to the infl; lvs thin, glabrous or with a few long hairs on the persistently glaucous lower surface, irregularly callous-toothed or subentire, the lowest ones petiolate, only slightly if at all enlarged, mostly soon deciduous, the others elliptic, often narrowly so, narrowed to a sessile or subsessile base, only gradually reduced upward, 4-12 נ1-2 cm; infl open-paniculiform, with long, flexuous, very slender peduncles, these, like the invol, glabrous or occasionally with some gland-tipped hairs; invol narrow, 5-9 mm; fls 8-30; achenes truncate, 1.8-2.5 mm; 2n=18. Woods; N.S. and Que. to Minn., s. to Va., O., and in the mts. to n. Ga. July-Sept. H. ءllegheniense Britton is a hybrid with no. 16 [Hieracium gronovii L.].
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.