COMPOSITAE (COMPOSITE FAMILY) 593 



Involucres not glabrous. 



Involucral bracts not setosely barbed. 



Pubescence wholly canescent (in no. 8, sometimes nearly 



wanting). 

 Leaf-blades and their lobes mostly lanceolate . 7. C. intermedia. 



Leaf-blades and their lobes mostly linear -. 

 Pubescence canescent with intermingled black hairs. 

 Bristly hairs glandular ..... 

 Bristly ,hairs not glandular 

 Involucral bracts setosely barbed on the carinate midrib 



8. C. gracilis. 



9. C. occidentalis. 



10. C. scopulorum. 



11. C. barbigera. 



1. Crepis nana Rich. App. Frank. Journ. ed. 2. 757. 1823. Forming de- 

 pressed tufts on creeping rootstocks: leaves chiefly radical, obovate to spatu- 

 late, entire, repand-dentate, or lyrate, commonly equaling the clustered 

 scapes or stems: heads in fruit nearly 12 mm. high: achenes linear, unequally 

 ribbed, obscurely contracted under the moderately dilated pappiferous disk. 

 Alpine mountain summits in Colorado and California, thence far northward. 



2. Crepis elegans Hook. Fl. Bor. Am. 1: 297. 1834. Many-stemmed from 

 a taproot, diffusely branched: leaves entire or nearly so; the radical spatulate; 

 the cauline lanceolate to linear: heads smaller: achenes linear, fusiform, 

 minutely scabrous on the equal narrow ribs, attenuate into a short slender 

 beak, which is discoid-dilated at summit. From Wyoming and Dakota to 

 the Saskatchewan. 



3. Crepis glauca T. & G. Fl. 2: 488. 1841. Perennial, scapose or rarely 

 with 1 or 2 leaves on the stem, 2-6 dm. high, glabrous and glaucous through- 

 put: basal leaves spatulate, ob lanceolate, or obovate, gradually narrowed 

 into margined petioles, entire, dentate, or pinnatifid, 5-15 cm. long, 1-2 cm. 

 wide: heads not numerous, long-peduncled, 12-25 mm. broad: peduncles 

 glabrous: involucre campanulate, the principal bracts lanceolate, acute, the 

 outer ones very short, ovate, appressed: achenes oblong-cylindric, strongly 

 10-ribbed. In moist saline soils; west of the Missouri to Nevada. 



4. Crepis runcinata T. & G. 1. c. Perennial, similar to the preceding 

 species but not glaucous or scarcely so, often pubescent below; stem leafless 

 or with 1 or 2 small leaves, 3-9 dm. high: basal leaves spatulate, obovate, or 

 oblong, obtuse or acute, entire, repand, dentate, or rarely runcinate-pinnatifid, 

 5-15 cm. long, 2-3 cm. wide: heads several, long-peduncled, nearly 25 mm. 

 broad; involucre campanulate, the principal bracts linear-lanceolate, acute, 

 outer ones short, lanceolate, appressed: achenes linear-oblong, 10-ribbed. 

 (C. platyphylla Greene, Pitt. 3: 27. 1896; C. glaucdla Rydb. Bull. Torri Bot. 

 Club 28: 512. 1901; C. tomentulosa, C. perplexans, and C. petiolata Rydb. 

 Bull. Torr. Bot. Club 32: 134 & 135. 1905. To recognize the foregoing one 

 would first have to assume a hypothetical C. runcinata.} In wet soils; 

 Utah and Colorado to Washington and the Saskatchewan. 



5. Crepis riparia A. Nels. Bull. Torr. Bot. Club 26: 486. 1899. Stems 

 1' or more, 2-4 dm. high, subscapose, minutely and sparsely pubescent, up- 

 ward becoming clammy or glandular: radical leaves few, rather large, oblong 

 to elliptic, obtuse to subacute, entire or coarsely and irregularly dentate and 

 at base more or less runcinate, 10-18 cm. long, on petioles of about half the 

 length, glabrous except on the petioles and midrib: inflorescence corymbose- 

 paniculate; heads 15-20 mm. high, many-flowered; involucre dark, glandular- 

 pubescent; bracts linear, in 2 rows; the outer few and short; the inner more 

 numerous (12-16): achenes tapering gradually from base to summit, about 

 6 mm. long, rather uniformly 10-striate, light brown; pappus soft and white, 

 shorter than the achene. Wet grassy banks at middle elevations; through- 

 out our range. 



5a. Crepis riparia parva A. Nels. Not distinguishable from the species 

 except by the small size, usually solitary heads, and small glabrous leaves. 

 (C. denticulate Rydb. 1. c.; C. alpicola A. Nels. Bot. Gaz. 40: 65. 1905.) In 

 subalpine parks; our range. 



6. Crepis acuminata Nutt. Trans. Am. Phil. Soc. 7: 437. 1841. Perennial, 

 slender, 3-8 or 9 dm. high, cymosely branched above; herbage cinereously 

 puberulent but the inflorescence nearly glabrous: lower leaves 15-25 cm. 

 long, broadly lanceolate in outline, pinnatifid with narrow spreading or re- 



ROCKY MT. BOT. 38 



