1921] Smiley: Flora of the Sierra Nevada of California 205 



1. Arabis Lyallii Wats., Proc. Am. Acad., vol. 11, p. 122. 1876. 



A. Drummondii var. alpina Wats., Bot. King's Exped., p. 18. 1871. 

 A. oreopUila Eydb., Bull. Torr. Bot. Club, vol. 34, p. 437. 1907. 



Type locality. "In the mountains from Washington Territory to 

 Mono Pass in the Sierra Nevada and eastward to W. Wyoming and 

 Utah." 



Range. British Columbia to California and northwest Wyoming. 



Zone. Hudsonian. 



Specimens examined. Plumas County, Mrs. Austin in May, 1877 ; 

 Summit, Jones 2564; Tamarack trail, Tahoe, 8,200 feet, Smiley 271; 

 Pyramid Peak, 9,900 feet, Smiley 118 ; Suzy Lake, Tahoe, 7,650 feet, 

 McGregor 132; Dog Lake, near Tuolumne meadows, 9,200 feet, Smiley 

 838 ; Mineral King, trail from Bullion Flat, 10,500 feet, Dudley 2588 ; 

 gravelly mountain slopes near Little Kern River, Tulare County, Pur- 

 pus 1815. 



la. Arabis Lyallii var. Davidsonii (Greene), comb. nov. 



A. Davidsoni Greene, Leaflets, vol. 2, p. 159. 1911. 



Type locality. "Bishop's Creek, Inyo Co., Calif." 



Range. Sierra Nevada only, so far as known. 



Zone. Canadian. 



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

 Mrs. C. M. Wilder, July 11, 1912 ; below Sabrina Lake, Inyo County, 

 9,000 feet, Davidson 2728. 



This variety differs from the species in the greener, longer petioled 

 leaves upon a stouter, more woody caudex ; differences, in my opinion, 

 of distinctly varietal rank. 



2. Arabis Lemmoni Wats., Proc. Am. Acad., vol. 22, p. 467. 1887. 



A. canescens var. latifolia Wats., Bot. King's Exped, p. 17. 1871. 



A. canescens Brewer and Wats., Bot. Calif., vol. 1, p. 32. 1876. 



A. latifolia (S. Wats.) Piper, Contr. Nat. Herb., vol. 11, p. 295. 1906. 



A. depauperata Nels. and Kenn., Proc. Biol. Soc. Wash., vol. 19, p. 36. 



1906. 

 A. polyclada Greene, Leaflets, vol. 2, p. 75. 1910. 



Type locality. Not definitely given; the type collection made by 

 Watson in the Clover Mountains of northern Nevada. 



Range. British Columbia to California and northern Wyoming. 



Zone. Arctic-alpine. 



Specimens examined. Mt. Rose, Kennedy 1167 (co-type of A. de- 

 pw'perata) ; Rubicon Peak, Tahoe, 8,000 feet, Smiley 405; Tinker's 



