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Family: Asteraceae
hairy hawkweed
[Hieracium longipilum Torr. ex Hook.] |
Plants 30-75(-200) cm. Stems proximally piloso-hirsute (hairs 6-15+ mm), distally piloso-hirsute (hairs 3-10+ mm), sometimes stellate-pubescent as well. Leaves: basal 3-8+, cauline (3-)6-12+; blades oblanceolate, 45-80(-250+) × 12-30(-40+) mm, lengths 4-7+ times widths, bases cuneate, margins entire, apices rounded to acute, faces piloso-hirsute (hairs 3-8+ mm). Heads 10-20+ in paniculiform to nearly racemiform arrays. Peduncles stellate-pubescent and stipitate-glandular, sometimes piloso-hirsute as well. Calyculi: bractlets 9-13+. Involucres campanulate, 6-8(-10) mm. Phyllaries 12-21+, apices acuminate, abaxial faces stellate-pubescent and stipitate-glandular. Florets 30-40(-60); corollas yellow, ca. 7 mm. Cypselae urceolate, 3-4+ mm; pappi of 35-40+, stramineous to sordid bristles in 2+ series, 5.5-6.5 mm. Flowering Jul-Sep. Fields, prairies, roadsides; 100-400 m; Ont.; Ark., Ill., Ind., Iowa, Kans., Ky., La., Mich., Minn., Mo., Nebr., Ohio, Okla., Tenn., Tex., Wis. Hieracium longipilum may be no longer present in Quebec. Plant with a short stout caudex or crown; stem 6-20 dm, densely long-hairy below, the hairs mostly 1 cm or more, sometimes 2 cm, becoming glabrous or nearly so above; lvs pubescent like the stem, or the hairs shorter; basal and lower cauline lvs rather numerous, oblanceolate or narrowly elliptic, 9-30 נ1.5-4.5 cm, crowded, the lowest ones often deciduous, the others progressively reduced upwards, the upper half of the stem commonly naked or merely bracteate; infl elongate, cylindric, the branches and peduncles stellate, long-stipitate-glandular and sometimes sparsely setose; invol 7-10 mm, stellate-puberulent and hispid with blackish, mostly gland-tipped hairs; fls 40-90; achenes 3-4.5 mm, narrowed above. Dry prairies, open woods, and fields, especially in sandy soil; Mich. and Ind. to Minn., Kans., and Okla. July, Aug.
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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