232 University of California Publications in Botany [Vol.9 



Specimens exanmied. — Silver Valley, 8,000 feet, on dry volcanic 

 rocks, Brewer 1974; peak near Sonora Pass, 11,000 feet. Brewer 1925; 

 Cloud's Rest, 10,000 feet, A. Gray in 1872. 



6. SPIRAEA 



Erect branching shrub; the red flowers in dense panicles 1. S. densiflora 



Low depressed shrub; the white flowers spicate 2. S. caespitosa 



1. Spiraea densiflora Nutt., in T. and G., FL, vol. 1, p. 414. 1840. 



S. betulaefolia Pall. var. rosea Gray, Proc. Am. Acad., vol. 8, p. 381. 1872. 

 S. lucida Dougl. var. rosea Greene, Pitt., vol. 2, p. 221. 1892. 

 ;Si. arhuscula Greene, Erythea, vol. 3, p. 63. 1895. 

 S. Belleri Rydb., N. Am. FL, vol. 22, p. 248. 1908. 



Type locality. — Blue Mountains of Oregon. 



Range. — British Columbia to Montana, south along the mountains 

 of Washington, Oregon, and California to the central Sierra Nevada. 



Zone. — Canadian. 



Specimens examined. — Near Summit Station, Heller 7022; Sierra 

 County, Lemmon 704 ; Glen Alpine to Mt. Tallac, Setchell and Dobie, 

 July 6-21, 1901 ; summit back of Jonesville, Butte County, 7,000 feet. 

 Heller 11665 ; Gilmore Lake, Tahoe, 8,300 feet, Abrams 4856 ; Silver 

 Lake, Alpine County, 8,000 feet, Hansen 235 ; shores of Angora Lake, 

 Tahoe, 7,600 feet, Smiley 34; Grass Lake, Tahoe, McGregor 13; 

 Ebbett's Pass, 8,900 feet, Brewer 2090; soda springs of the Tuolumne, 

 Yosemite, 8,680 feet. Brewer 1777 ; Lake Tenaj^a, Yosemite, 8,143 feet, 

 border of lake. Smiley 701 ; Shuteye Pass, Sierra National Forest, 

 7,000 feet, Abrams 4937; Shuteye Mountain, Madera County, 8,000 

 feet, J. Murdoch Jr. 2521. 



In the Sierra, this shrub does not seem to rise so high as in the 

 mountains of Washington; in our region it is preeminently a plant 

 found about lake borders of the Canadian ; in Washington, Piper 

 assigns it to the Hudsonian, while according to C. S. Sargent (Gard. 

 and Forest, vol. !10, p. 410), it forms dense mats at timber line at 

 5,000 feet on the Olympics and on Mt. Rainier ascends 2,000 feet 

 higher. 



2. Spiraea caespitosa Nutt., in T. and G., FL, vol. 1, p. 418. 1840. 



Eriogynia caespitosa Wats., Bot. Gaz., vol. 15, p. 242. 1890. 

 Luetkea caespitosa O. Kuntze, Rev. Gen., vol. 1, p. 217. 1891. 

 Petrophyton caespitosum (Nutt.) Rydb., Mem. N. Y. Bot. Gard., vol. 1, 



p. 206. 1900. 

 Petrophytori acuviimitwm Rydb., N. Am. FL, vol. 22, p. 253, 1908. 



