1921] Smiley: Flora of the Sierra Nevada of Calif ornia 99 



10. SITANION 



Sheaths and dorsal surfaces of the leaves glabrous and glaucous ....1. S. rigldum 



Sheaths and dorsal surfaces of the leaves pubescent or scabrous 



2. S. rigidum var. califomicum 



1. Sitanion rigidum J. G. Smith, U. S. Dept. Agr., Div. Agrost. 



Bull. 18, p. 13. 1899. 



Type locality. — "Cascade Mountains, Washington." 0. D. Allen 

 178. 



Range. — Washington to southern California, east to Wyoming. 



Zone. — Canadian and Hudsoniaii, but ranging downward to Upper 

 Sonoran. 



Specimens examined. — Mt. Tallac, east side in talus rock, 9,500 

 feet, Smiley 240 ; Camp Agassiz, above Fallen Leaf Lake, Tahoe, dry 

 rocky soil, 7,100 feet. Smiley 362 ; south side of Polly Dome, Lake 

 Tenaya, Yosemite, 8,300 feet, Smiley 870; Mt. Tallac, 9,740 feet, Hall 

 and Chandler 4628; Tinker's Knob, Placer County, 9,000 feet, C. F. 

 Sonne 7 ; foot of Mt. Whitney, 12,000 feet, Rothrock 403. 



Professor Hitchcock (Jepson, I.e., p. 188) reduces this species 

 to a synonym of S. minus J. G. Smith {I.e.), which was described from 

 Jacumba, San Diego County, in the Upper Sonoran zone (collected 

 by Schoen-efeldt 3277). *S'. rigidum is reported growing in rock crevice 

 on the summit of Mt. Grayback in the San Bernardino Mountains at 

 an elevation of 11,725 feet.°* A specimen from that station preserved 

 in the Gray Herbarium {W. G. Wright 87) is, however, better re- 

 ferred to the following variety. 



2. Sitanion rigidum var. calif ornicum (J. G. Smith), comb. nov. 



S. oalif ornicum J. G. Smith, U. S. Dept. Agr., Div. Agrost. Bull. 18, p. 13. 

 1899. 



Type locality. — "San Bernardino Mountains, California, altitude 

 2,150 m." 



Range. — Sierra Nevada and mountains of southern California, 

 occurring with the species. 



Zone. — Same as the species. 



Specimens examined. — Mt. Lola, Tahoe, Kennedy 183; Angora 

 Peak, Tahoe, 8,600 feet. Smiley 42 ; Mt. Gibbs, Yosemite, 12,200 feet, 

 Smiley 728; Denel's Peak, timber line at 11,000 feet, Hall and Bab- 

 cock 5513. 



