242 University of California Publications in Botany [Vol. 9 



Specimens examined. — Silver Lake, Amador County, 8,000 feet, 

 Hansen 292; same locality, 7,200 feet, E. Mulliken 127; Lake Tenaya, 

 8,200 feet. Hall and Babcock 3526; Elizabeth Lake, Tuolumne 

 meadows. 9,800 feet, Smiley 795 ; meadows near Black Mountain, 

 Fresno County, 9,500 feet. Hall and Chandler 593 ; about Marietta 

 Lake, east of Lake Tahoe, 2,460 m.. Baker 1413. 



The variety is the smaller form of the higher mountains, with the 

 small leaves deeply incised. 



3. Horkelia tridentata Torr., Pac. R.R. Rep., vol. 4, p. 84. 1857. 



Ivesia tridentata Gray, Proc. Am. Acad., vol. 7, p. 338. 1868. 

 Horkelia Tilingi Eegel, Acta Hort. Petrop., vol. 1, p. 143. 1871. 

 Potentilla Tilingi Greene, Pitt., vol. 1, p. 105. 1887. 



Type locality. — "Duffield's Ranch," Sierra Nevada. 

 Range. — Sierra Nevada to southern Oregon. 

 Zone. — Transition and occasionally in the Canadian. 

 Specimens examined.- — Donner Lake, Heller 6948, 6960 ; Silver 

 Lake, Amador County, 8,000 feet, Hansen 985. 



11. SIBBAliDIA 



1. Sibbaldia procumbens L., Sp. PL, p. 284. 1753. 



Type locality. — ''Habitat in alpibus Lapponiae, Helvetiae, 

 Scothiae. ' ' 



Range. — Holarctic realm ; in North America south from the arctic 

 regions to eastern Quebec, White Mountains of New Hampshire ; in 

 the Rocky Mountains to northern New Mexico and along the Pacific 

 Coast Mountains to the southern Sierra Nevada. 



Zone. — Canadian to Arctic-alpine. 



Specimens examined. — High ridge above Donner Pass, 8,500 feet, 

 Heller 7181 ; Mt. Rose, 10,000 feet, Kennedy 1150 ; Desolation Valley, 

 Tahoe, McGregor 750; Rubicon Peak, moist flat, 9,000 feet. Smiley 

 408 ; Tuolumne meadows, sand margins of Tuolumne River, 8,600 feet, 

 R. A. Ware 2683c; Mt. Dana, 12,500 feet, Bolander 5082; Mt. God- 

 dard, 11,500 feet. Hall and Chandler 598 ; Cathedral Peak, above 

 Tuolumne meadows, 10,000 feet. Smiley 816; Mt. Lyell, 10,000 feet. 

 Hall and Babcock 3589 ; Hockett 's meadows, Tulare County, Dudley 

 1,000 ; Black Peak Brook, Kaweah Peaks, Tulare County, 12,000 feet, 

 Dudley 2117; north ravine of Mt. Silliman, Tulare County, 10-11,000 

 feet, Dudely 1506 ; lower slope of Sawtooth Peak, Tulare County, 

 11-12,000 feet, Dudley 1609 ; Farewell Gap, 10,300 feet, Purpus 5194. 



