258 University of California Publications in Botany [VOL. 9 



Specimens examined. Mono Pass, Congdon, August 26, 1895 ; 

 mountains near Sonora Pass, 9,000 feet, Brewer 1878. 



Piper (I.e.} reports this species as Upper Sonoran in zonal position 

 in Washington. 



3. Astragalus platytropis jGray, Proc. Am. Acad., vol. 6, p. 526. 

 Type locality. "Dry rocky mountain near Sonora Pass in loose 



gravel and sand near the summit (alt. 10,000 feet)." 



Range. Southwestern Montana across the northern half of the 



Great Basin to the Sierra Nevada. 



Specimen examined. Mountain summit near Sonora Pass, 10,000 



feet, Brewer 1889. 



4. Astragalus Whitney! Gray, Proc. Am. Acad., vol. 6, p. 526. 



1866. 



Type locality "Dry rocky mountain near Sonora Pass in loose 

 soil, near the summit, alt. 10,000 feet." 



Range. Sierra Nevada in the northern and central part. 



Zone. Hudsonian and Arctic-alpine. 



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

 feet, Heller 7101 ; Mt. Rose, 10,300 feet, Heller 10650 ; same locality, 

 10,800 feet, Heller 9937; mountain near Sonora Pass, 10,000 feet, 

 Brewer 1886; Ebbett's Pass, growing on Silver Mountain, Hooker 

 and Gray in 1877 ; Mt. Warren, Tuolumne County, summit, Congdon, 

 August 21, 1894 ; Rubicon Peak, Tahoe, 9,100 feet, Smiley 410. 



4a. Astragalus Whitney! var. pinosus Elmer, Bot. Gaz., vol. 39, 

 p. 54. 1905. 



Type locality. "Summit of Mt. Pinos, Ventura County, Califor- 

 nia." 



Range. Tehachapi Mountains; southern Sierra Nevada? 



Zone. Canadian. 



Specimen examined. Summit of Mt. Pinos, 8,800 feet, Dudley 

 and Lamb 4588. 



Astragalus Whitneyi is very close to A. Hookerianus Gray (I.e., 

 p. 215), a species of eastern Washington, Oregon, and Idaho, and 

 perhaps reaching the northern Sierra Nevada in Plumas County (top 

 of Diamond Mountain, near Susanville, 7,300 feet, M. E. Jones, June 

 28, 1897, perhaps A. Hookerianus) ; the chief difference between the 

 species is the difference in the size of the pods, which in A. Whitneyi 

 is an inch or less long, in the other species usually nearly twice as 

 long. 



