150 University of California Publications in Botany [Vol.9 



species, states that it "is nearest related to ;S', saxiniontana, and per- 

 haps represents only the most depauperate form thereof." Professor 

 Piper'^^ includes >S^, saximontana among the willows of Washington, 

 with the comment: "Probably not specifically distinct from 8. 

 nivalis/' The above cited specimen is the only known collection from 

 California. 



3. Salix macrocarpa Nutt., var. argentea Bebb, Bot. Gaz., vol. 10, 



p. 225. 1885. 



S. Geyeriana Anderss., Sal. Bor. Am., p. 63 d^). 1858. 

 S. Covillei Eastwood, Zoe, vol. 5, p. 80. 1900. 



Type locality. — Plumas and Sierra counties. 



Range. — Sierra Nevada, northward to Idaho. 



Zone. — Upper transition and Canadian. 



Specimens examined. — Near Red Clover Valley, Plumas County, 

 Heller and Kennedy 8728; Donner Lake meadow, Tahoe region, 

 Dudley 5001 ; Lake Vallej^ Tahoe, Abrams 4778 ; Twin Lakes, Alpine 

 County, 8,500 feet, Hansen 199 ; South Fork of the San Joaquin, 6,700 

 feet. Hall and Chandler 632; Golden Trout Creek, Tulare County, 

 8,500 feet, H. M. and G. R. Hall 8415; AVliitney meadows, 8-9,000 

 feet, Purpus 1893. 



This variety of the more northern species is a common willow in 

 the Sierra about sandy meadows or in washes in the streams; it 

 becomes 12-16 feet high, forming a very attractive coppice because of 

 its glistening foliage. 



4. Salix cordata var. Watsoni Bebb, in Wats., Bot. Calif., vol. 2, 



p. 86. 1880. 



Type locality. — "Near Carson City {Watson), and in Sierra 

 Count}^, Lenimon." 



Range. — Mountains of California from the San Jacintos northward 

 through the Sierra and eastward in the Great Basin. 



Zone. — Arid Transition and entering the Canadian. 



Specimens examined. — Johnson Lake above Crescent Lake, Yosem- 

 ite, Congdon, August 2, 1898 ; Yosemite Valley, Abrams 4492. 



5. Salix monica Bebb, in Wats., Bot. Calif., vol. 2, p. 90. 1880. 



Type locality. — ' ' Mono Pass summit. ' ' 



Range. — High peaks of the central Sierra Nevada. 



Zone. — Arctic-alpine and extending downward below timber line. 



