This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Crepis biennis L. Sp. Pl. 807. 1753.
Biennial, or sometimes annual; stem pubescent or hirsute, leafy, at least below, branched above, 2°-3° high. Leaves runcinate-pinnatifid, usually hirsute, 2'-6' long, oblong or spatulate, the lower and basal ones narrowed into petioles and sometimes merely dentate, the uppermost lanceolate, clasping, their margins not revolute; heads several, subcorymbose, 1'-1 1/2' broad; involucre canes-cent or pubescent, 4"-6" high, its principal bracts linear-lanceolate, downy within, the outer ones linear-oblong or lanceolate, spreading; achenes oblong, slightly narrowed above, 13-striate, glabrous.
In waste places, Vermont to Pennsylvania, Michigan, and in ballast about the seaports. Naturalized or adventive from Europe. June-Aug.
Crepis intermedia A. Gray, Syn. Fl. 1: Part 2, 432. 1884.
Perennial, cinerous-puberulent or scurfy; stem rather slender, 1-3-leaved, 1°-2° high, naked and branched above. Basal leaves lanceolate or oblong-lanceolate, laciniate-pinnatifid, long-acuminate at the apex, narrowed at the base, 4'-6' long; stem leaves lanceolate, sessile, less divided; heads several, 6"-9" broad, 5-8-flowered; involucre oblong-campanulate, its principal bracts 5-8, lanceolate or linear-oblong, canescent, acut-ish, somewhat keeled by the thickened midrib when old, the outer ones few and short; achenes oblong, narrowed above, not beaked, strongly 10-ribbed.
In dry soil, western Nebraska (according to Williams); Colorado to California, Montana and British Columbia. May-Sept.
Perennial, scurfy and canescent, sometimes also hirsute; stem rather stout, leafy, branched, 6-18' high. Leaves oblong-lanceolate or oblong in outline, laciniate-pinnatifid, acute or acuminate, the lower and basal ones 6-10' long, narrowed into petioles, the upper sessile and slightly clasping; heads few or several, corymbose, stout-peduncled, about 1' broad, 10-30-flowered; involucre oblong-campanulate, canescent, its principal bracts 9-24, linear, acute; achenes oblong, sharply 10-ribbed, glabrous.
Plains, western Nebraska (according to Gray); Colorado to California, north to Montana and British Columbia. May-July.