1921] Smiley: Flora of the Sierra Nevada of California 209 



Arabis Howellii Wats. (Proc. Am. Acad., vol. 25, p. 124. 1890), 

 a species of southern Oregon and also found by Shockley in the White 

 Mountains of Inyo County, is attributed to Mariposa County on a 

 collection of Congdon's (not seen by me) in the Syn. Fl., vol. 1, pt. 1, 

 p. 470 ; this species resembles A. platysperma in appearance but is dis- 

 tinguished by absence of nervation in the valves of the silique. No 

 collections referable to A. Howellii have been seen by me from the 

 Sierra Nevada. 



Arabis Sabulosa var. frigida Jones (Contr. W. Coast Bot., vol. 14, 

 p. 41. 1912) , described from ' ' Top of Diamond Peak (Central Sierra) , 

 Cal., June 28, 1897, nearly alpine, Jones," is unknown to me except 

 from description. 



10. STREPTANTHTJS 



Branches of the inflorescence bearing cordate bracts 1. S. tortuosus 



Branches of the inflorescence ebracteate 2. S. cordatus 



1. Streptanthus tortuosus Kellogg, Proc. Calif. Acad., vol. 2, p. 

 152, t. 46. 1863. 



Type locality. "From the copper region of the Sierra Nevada 

 Mountains. ' ' 



Range. Sierra Nevada to Mt. Shasta and (according to Syn. Fl.) 

 in the Coast region near Humboldt Bay. 



la. Streptanthus tortuosus var. orbiculatus Hall., Univ. Calif. 

 Publ. Bot., vol. 4, p. 197. 1912. 



S. orbiculatus Greene, Fl. Fran., p. 258. 1891. 



S. gracilis Eastwood, Proc. Calif. Acad. Ill, vol. 2, p. 285. 1902. 



Pleiocardia orbiculata Greene, Leaflets, vol. 1, p. 86. 1904. 



Type locality. ' ' Common in the Sierra from Donner Lake north- 

 ward; also on Mt. Diablo." 



Range. Sierra Nevada to Mt. Shasta; in the Coast Range, ace. 

 Greene. 



Zone.- Canadian to above timber line. 



Specimens examined. Above Donner Lake toward Donner Pass, 

 Heller 7016 ; Fallen Leaf Trail to Mt. Tallac, 8,500 feet, Abrams 4827 ; 

 Half -Moon Lake, Tahoe, McGregor 77 ; glacial valley at base of Pyra- 

 mid Peak, dry sandy spots, 8,600 feet, Smiley 90; between Suzy and 

 Heather Lakes, Tahoe, 7,600 feet, Smiley 148 ; Pyramid Peak, W. S. 

 Atkinson in 1900; Silver Lake, Amador County, Hansen 728; Mt. 



