1921] Smiley: Flora of the Sierra Nevada, of California 201 



species is known to range from Mt. Lassen northward to the moun- 

 tains of Washington; it is nearly allied to D. corrugata Wats. (I.e.), 

 an alpine species peculiar to the San Bernardino Mountains of south- 

 ern California. 



3. THLASPI 



1. Thlaspi alpestre L., Sp. PL, ed. 2, vol. 2, p. 903. 1763. 



Type locality. "Habitat in Austria." 



Range. Holarctic realm; in America south from British Colum- 

 bia to California and along the Rockies to Colorado and New Mexico. 



Zone. Canadian and above. 



Specimens examined. Spanish Peak, Plumas County, 6,000 feet, 

 Mrs. R. M. Austin in 1877 ; same locality, Hall 9287. 



Mrs. Austin's specimen shows a certain pallidness in color, a trait 

 that in some plants becomes more pronounced and serves as the basis 

 for "T. glaucum" A. Nels., an indefinable variation. 



4. ERYSIMUM 



Pods slightly compressed and long attenuate to the style 1. E. arenicola 



Pods terete or 4-angled, abruptly narrowing to the style 2. E. asperum 



1. Erysimum arenicola Wats., Proc. Am. Acad., p. 26, vol. 124. 

 1891. 



Type locality. "In volcanic sand on the Olympic Mountains, 

 Washington, at 5,000 feet altitude." 



Range. Washington to the Sierra Nevada. 



Zone. Arctic-alpine. 



Specimens examined. Mt. Goddard, 11,100 feet, Hall and Chand- 

 ler 677 in part ; Mt. Guyot, Tulare County, 11,500-12,000 feet, H. M. 

 and G. R. Hall 8423. 



The reference of these collections to this species involves a very 

 considerable extension of the range of this species, which otherwise 

 is known only from the Cascades, but the flattened pods and long- 

 attenuate beak to the pod are characters inconsistent with the normal 

 habit of the following species or of its variety and are distinctly those 

 of the northern species. 



