594 COMPOSITAE (COMPOSITE FAMILY) 



trorse lobes, attenuate below into a petiole and above into a tail-like prolon- 

 gation 8 cm. or less long: involucre narrow, 10-12 mm. high; minute outer 

 bracts canescent; inner bracts 5-8, bright green, glabrate: flowers 5-10: 

 achenes fusiform, somewhat narrowed at summit. Dry ground, middle 

 elevations; in our range and west to the Pacific States. 



7. Crepis intermedia Gray, Syn. Fl. 1: 432. 1886. Habit and foliage of 

 the preceding, or less tall, more cinereous-puberulent v usually with fewer 

 heads: involucre 12 mm. or more long, canescently puberulent; the bracts in 

 age more carinate by thickened midrib: achenes acutely 10-costate at ma- 

 turity, oblong-fusiform, slightly attenuate upward, longer than or equaling 

 the pappus. Rocky Mountains in Colorado to the Sierra Nevada, California, 

 and north to Washington. 



8. Crepis gracilis (Eat.) Rydb. Mem. N. Y. Bot. Gard. 1: 461. 1900. 

 Closely related to the preceding but lower and very slender: the body of the 

 leaves very narrow and with linear-attenuate apical prolongation and mostly 

 with upwardly turned linear-acuminate lobes: as in the preceding the princi- 

 pal bracts of the involucre and the flowers each 7-8. (C. angustata Rydb. 

 Bull. Torr. Bot. Club 32: 135. 1905.) Colorado to Montana and Washington. 



9. Crepis occidentalis Nutt. Journ. Acad. Phila. 7: 29. 1834. Stem stout, 

 usually several from the strong perennial root, branching above, the whole 

 plant 1-2 dm. high; herbage tomentose (the tomentum sometimes with a 

 tendency to fall in age) and often glandular-hirsute above, especially on the 

 peduncles: leaves thickish, runcinately toothed or deeply pinnatifid into 

 linear or lanceolate lobes, the uppermost portion entire, acuminate: involucre 

 10-30-flowered, 12-15 mm. high, calyculate, the 8-24 bracts oblong-lanceolate: 

 achenes brown, fusiform, 10-18-costate, 8-9 mm. long. (C. pumila Rydb. 

 Mem. N. Y. Bot. Gard. 1: 462. 1900.) Dry open or semi-wooded hillsides; in 

 our range and west to the Pacific States. 



10. Crepis scopulorum Coville, Contrib. Nat. Herb. 3: 563. 1896. Tomen- 

 tose, often glabrate in age, and bearing toward the base scattered eglandulose 

 bristles; stems rather slender, 1-4 dm. high, solitary or few from the same 

 caudex, bearing 1-5 heads: leaves broadly lanceolate in outline, 10-15 cm. 

 long, pinnately or bipinnately divided into linear-lanceolate lobes: peduncles 

 slender, usually thickened just below the heads: involucre 12-16 mm. high; 

 the bracts linear-lanceolate and barely acute, or the shorter ones acuminate : 

 achenes 8-12 mm. long, fusiform, truncate at the apex, not costate, but 

 sometimes obscurely striate. Same range as the preceding. 



11. Crepis barbigera Leiberg, Contr. Nat. Herb. 3: 565. 1896. Slightly 

 tomentose with a minute somewhat flpcculent tomentum, not at all hirsute; 

 stems several from the crown on a thick perennial root, 3-6 dm. high, spar- 

 ingly leafy and bearing an ample corymbose cyme of rather small heads: 

 leaves broadly lanceolate in outline, 1-2 dm. long, runcinately toothed or 

 deeply cut into linear-lanceolate lobes: involucre 10-14 mm. high, of linear, 

 mostly obtuse principal bracts and a few very small ovate or lanceolate acute 

 ones at base, all canescent-tomentose and more or less bristly with setaceous 

 white bristles. (C. atribarba Heller, Bull. Torr. Bot. Club 26: 314. 1898.) 

 Reaching our range in Yellowstone Park and adjacent Idaho and Montana. 



103. HIERACIUM L. HAWKWEED 



Perennial herbs, with alternate or all radical leaves and small to large erect 

 heads of yellow rarely white or red flowers in panicles or corymbs, or solitary. 

 Involucre several-many-flowered, of yarrow equal bracts and some short 

 calyculate ones, or sometimes imbricated, not thickened at base or with 

 thickened midrib. Achenes oblong or columnar, smooth and glabrous, mostly 

 10-ribbed or striate, either terete or 4- or 5-angled, slightly contracted at the 

 very base, commonly of the same thickness to the truncate summit. Pappus 

 of rather rigid, scabrous, fragile bristles, brown or brownish, rarely white and 

 soft. 



