390 University of California Puhlications in Botany [Vol.9 



Specimens examined. — Castle Peak, near the highest point, 9,000 

 feet, Heller 7102; Silver Mountain, Alpine County, 10-11,000 feet, 

 Bolander 2686 ; base of I\It. Gibbs, Yosemite, 10,000 feet, Smiley 763 ; 

 same locality, north side at 11,000 feet. Smiley 773 ; dry hilltop near 

 Ebbett's Pass, 8,500-9,500 feet, Brewer 2005; peak near Sonora Pass, 

 11,500 feet, Brewer 1905 ;* Mt. Dana, above timber line, E. B. Bab- 

 cock, August, 1915 ; same locality, 11,750-12,200 feet. Hall and Bab- 

 cock 3613; dry slopes near the summit of Sonora Pass, 11,500 feet, 

 State Survey 1904; near Lundy, Mono County, 8-9,000 feet, Miss 

 M. IMinthorn 17;* Bloody Caiion, on dry ledges, 8,500 feet, R. A. 

 Ware 2641c;* Kaiser Peak, Fresno County, 9,800 feet. Smiley 636; 

 Andrew's Camp, Inyo County, A. Davidson 2573; Rock Creek Caiion, 

 10,000 feet, Tulare County, Hall and Babcock 5526 (cotype) ; Whit- 

 ney meadows, Tulare County, 10,000 feet, Mus. Vert. Zool. Exped., 

 Aug. 17, 1911 ; rocky mountain slopes on Little Kern River, 10-11,000 

 feet, Purpus 5240; Toowa Range, Tulare County, in Indian Head 

 Caiion, Hall and Babcock 5305. 



Dr. J. M. Greenman considers such plants as are represented hy 

 State Survey no. 1904, which appears similar to several others of the 

 collections cited {Hall and Balcock 3613; Smiley 773), to constitute 

 a distinct species, S. Muirii Greenm. (Ann. Mo. Bot. Gard., vol. 5, p. 56. 

 1918), the type "Collected on Mount Dana, California, alt. 3,050- 

 3,655 m. " by the old State Survey. The reasons for separating these 

 plants from the bulk of the Sierran material allied to S. canus Hook. 

 (Fl. Bor. Am., vol. 1, p. 333, pi. 116. 1834) are not clear to me nor 

 do they appear significant when the descriptions of S. Muirii and S. 

 oreopolus are compared. Just what relation our Sierran plants, here 

 accepted as constituting S. oreopolus, have to S. canus is still obscure. 

 The bulk of our material shows certain differences from Hooker's 

 figure, wherein the achene is represented as enlarging upward and 

 hairy on the angles, while the Sierran plants consistently have the 

 achene columnar, not enlarged upward, and entirely glabrous. Dr. 

 Greenman, however, in describing S. canus (Monogr. in Ann., vol. 5, 

 p. 74) says "achenes glabrous (notwithstanding original illustration." 

 If this criticism of Hooker's figure is correct, the propriety of regard- 

 ing our Sierran plants distinct from S. camis may well be called in 

 question. 



* These collections present plants Avithout rays as a rule. Brewer 190o is the 

 collection cited by Dr. Greenman as the type of the eradiate form, f. aphanactis 

 Greenm. {I.e., p. 269), but this form is impossible to maintain; the sheet of this 

 number, preserved in the herbarium at Berkeley, shows both radiate and discoid 

 heads on the same shoot. 



