1921] Smiley: Flora of the Sierra Nevad<i of California 233 



Type locality. — "On hig-li shelving rocks in the Rocky Mountains, 

 towards the sources of the Platte. ' ' 



Range. — Montana and Black Hills of South Dakota to New Mexico 

 and west in the mountains of Arizona and southern Nevada to the 

 southern Sierra Nevada. 



Zone. — Arid Transition or Canadian, 



Specimen examined. -^^i^ Arroyo, Tulare County, Culbertson 

 (B4540). 



The specimen cited is the basis for P. acuminatum Rydb. ; it would 

 seem that the characters relied upon to distinguish this species have 

 been incautiously chosen : it is said that in the type the petals are 

 "very acute or acuminate," but in the specimen of this collection 

 preserved in the Gray Herbarium the petals are really truncate, or 

 similar to those of Nuttall 's species, 



7. pyhus 

 1. Pyrus sitchensis var. californica (Greene), comb. nov. 



Sorhus californica Greene, Pitt., vol. 4, p. 131. 1900. 



Type locality. — "Common at middle elevations in the Calif ornian 

 Sierra," 



Range. — Sierra Nevada, 



Zone. — Canadian and Hudsonian. 



Specimens examined. — Mt. Elwell, Plumas County, 7,800 feet. 

 Hall 9340; Gold Lake, Sierra County, 6,400 feet. Hall and Babcock 

 4514; Glen Alpine, Tahoe, W. W. Price, July 8, 1898; Fallen Leaf 

 trail to Mt. Tallac, 8,000 feet, Abrams 4814; Silver Lake, Amador 

 County, 8,000 feet, Hansen 789 ; Summit, Placer County, 7,000 feet, 

 Heller 9835, 7026; Ralston Peak, Tahoe, 8,300 feet. Smiley 416; 

 Ebbett's Pass, 6,500-8,500 feet, Brewer 2091; Shuteye Pass, Sierra 

 National Forest, 7,000 feet, Abrams 4943; base of Pyramid Peak, 

 Tahoe, 8,600 feet. Smiley 76; Chilnualna Falls, Mariposa County, 

 Congdon, August 21, 1889 ; Dog Lake, near Tuolumne meadows, 9240 

 feet, Smiley 837 ; Farewell Gap, Tulare County, 10,000 feet, Culbert- 

 son (B4527) ; near Alta Peak, Tulare County, 9-10,000 feet, Dudley 

 988. 



I am not certain whether this is even varietally distinct from 

 P. sitchensis (Roem.) Piper, a species ranging from southeastern 

 Alaska to at least northwestern California, but our form commonly 

 shows the leaflets smaller with their distal ends abruptly acuminate, 

 as contrasted with the typical form of the northwest coast. 



