1032 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



columnar or fusiform, 10- to 20-ribbed; pappus copious, of soft white 

 capillary bristles. 



Key to the species 



1. Plant glabrous and glaucous, scapose or with a single stem leaf_ _ 1. C. glauca. 

 1. Plant more or less pubescent, glandular or tomentose; stem more or less 

 leafy (2). 

 2. Heads thick-cylindric (5 to 9 mm. thick at anthesis), normally 12- to 25- 

 flowered; plant low, usually less than 30 cm. high; involucre tomentulose 

 and often glandular-hispid; heads usually few _ _ 2. C. occidentalis. 

 2. Heads slender-cylindric (3 to 5 mm. thick at anthesis), normally 5- to 15- 

 flowered; plant usually taller, more than 30 cm. high; involucre tomentu- 

 lose or glabrous; heads usually numerous (3). 

 3. Involucre normally glabrous except for some ciliolation on the outer 

 bractlets; principal phyllaries 5 to 7; heads 5- to 10-flowered. 



3. C. ACUMINATA. 



3. Involucre tomentulose; principal phyllaries 8; heads 10- to 15-flowered. 



4. C. INTERMEDIA. 



1. Crepis glauca (Nutt.) Torr. and Gray, Fl. North Amer. 2: 488. 



1843. 



Crepidium glaucum Nutt., Amer. Phil. Soc. Trans, ser. 2, 7: 



436. 1841. 

 Crepis chamaephylla Woot. and Standi., Contrib. U. S. Natl. 



Herbarium 16: 175. 1913. 



Apache and Navajo Counties, about 5,000 feet, sometimes in saline 

 soil, June to August, the type of C. chamaephylla from the Carrizo 

 Mountains (Standley 7419). South Dakota, Saskatchewan, and 

 Idaho, south to Colorado and northeastern Arizona. 



A specimen from the White Mountains (Griffiths 5354) is regarded 

 by Babcock and Stebbins (see footnote 21, p. 1031, Babcock and 

 Stebbins, p. 102) as intermediate between their C. runcinata subsp. 

 glauca and subsp. barberi (Greenm.) Babcock and Stebbins, of New 

 Mexico and Chihuahua, having the very narrow leaves of subsp. 

 barberi but the short involucre of subsp. glauca. 



2. Crepis occidentals Nutt., Acad. Nat, Sci. Phila. Jour. 7: 29. 1834. 

 Keam Canyon (Navajo County), Grand Canyon and Flagstaff to 



Ash Fork (Coconino County), 6,200 to 7,200 feet, open ground, June. 

 Saskatchewan to British Columbia, south to northern New Mexico, 

 northern Arizona, and California. 



3. Crepis acuminata Nutt., Amer. Phil. Soc. Trans, ser. 2,7: 437. 1841. 

 " Arizona," without definite locality (Palmer in' 1869), July and 



August. Montana to Washington, south to Colorado, northern 

 Arizona, and California. 



Palmer's specimen is the only one purporting to have been collected 

 in Arizona that the writer has examined. It has a glabrous involucre, 

 as is normal for the species. Babcock and Stebbins (see footnote 21, 

 p. 1031, Babcock and Stebbins, p. 177) cite a specimen from Jacobs 

 Pools, Coconino County (Jaeger in 1926) as related to their apomictic 

 form nevadensis, which has the inner phyllaries lightly tomentulose. 



4. Crepis intermedia A. Gray, Syn. Fl. 1 2 : 432. 1884. 



Grand Canyon, Coconino County (Tourney 664, Ward in 1901), 

 June and July. Colorado to Alberta, south to northern Arizona and 

 California. 



