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



species is kno^\Ta 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- 

 em 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. glaucuni" 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. 



