1921 ] Smiley: Flora of the Sierra Nevada of California 207 



Specimens examined. Near Castle Peak, Heller 7069; Dormer 

 Pass, Davy 3184; Collins meadow, Fresno County, 7,000 feet, Hall 

 and Chandler 533, the last not certainly referred. 



5. Arabis Holboellii Hornem., Fl. Dan., vol. 11, p. 5, pi. 1879. 



1827. 



Type locality. "In rupibus Insulae Disco ad Jacobshavn detexit." 



Range. Greenland through subarctic America south to Quebec, 

 Great Lakes, Montana, and California. 



Zone. Canadian. 



Specimens examined. Ralston Peak, Tahoe, 8,300 feet, Smiley 

 421; Silver Lake, Amador County, 8,000 feet, Hansen 568; Ebbett's 

 Pass, Brewer 2028 ; Tuolumne meadows, foot of Lamberts Dome, 8,600 

 feet, Smiley 758 ; Lake Tenaya trail, Yosemite, Congdon, August 14, 

 1894; Tuolumne meadows, dry pine forest, 8,600 feet, R. A. Ware 

 2669c; Indian Creek, Yosemite, 7,300 feet, Hall 9177; divide south 

 side of Slide Mountain, Washoe County, Nevada, 7,600 feet, Heller 

 10919; sunny mountain slopes above Hockett's meadows, Tulare 

 County, 9-10,000 feet, Purpus 1792; Mt. Lola, south side, Tahoe 

 region, 7,500 feet, Hall and Babcock 4539. 



All of the above cited specimens agree excellently with Horne- 

 mann's plate save that the stellate pubescence on the sepals is often 

 reduced in amount. 



Piper (Fl. Wash.) refers this species to the Arid Transition; in 

 the Sierra, the type form appears to be definitely of the boreal realm 

 though the var. Fendleri Wats, is Transition or lower. 



Arabis Brucae Jones (Contr. W. Coast Bot., vol. 14, p. 37. 1912), 

 said to be related to the above species and described from ' ' Hills near 

 Davis Creek, Calif., June, 1898, in flower only, part of Mrs. Bruce 's 

 No. 225 ; Summit, Cal., Nevada Co., July 10, 1902, Jones," is unknown 

 to me except from the description, where the characters seem to be 

 inadequate for its separation. 



6. Arabis platysperma Gray, Proc. Am. Acad., vol. 6, p. 519. 



1866. 



A. platyloba Greene, Pitt., vol. 4, p. 198. 1900. 



A. conferta Greene, Bep. Nov. Spe., vol. 5, p. 243. 1908. 



A. densa Greene, Leaflets, vol. 2, p, 76. 1910. 



A. paupercula Greene, I.e., p. 77. 



Type locality. "Sierra Nevada, on Mount Dana, alt. 13,227 feet, 

 an* above Ebbett 's Pass. ' ' 



