1921] Smiley: Flora of the Sierra Nevada of California 357 



3a. Chrysothamnus nevadensis f. monocephala (A. Nels. and Ken- 

 nedy), forma nov. 



Chrysothamnus monocephala A. Nels. and Kennedy, Proc. Biol. Soc. Wash., 

 vol. 19, p. 39. 1906. 



Type locality. "Summit of Mount Rose, Washoe County, 

 Nevada. ' ' 



Range. With the type? 



Zone. Hudsonian and arctic-alpine. 



Specimens examined. Mt. Rose, 10,000 feet, Heller 9976; same 

 locality, 10,800 feet, Kennedy 1171. 



In this form the stems bear but a single head and the plant appears 

 somewhat more rigid or spinescent than in the species. 



3b. Chrysothamnus nevadensis var. vulcanicus (Greene), var. nov. 

 C. vulcanicus Greene, Leaflets, vol. 1, p. 80. 1904. 



Type locality. "On Volcano Creek, above Volcano Falls, at 8,000 

 feet," Tulare County. 



Range. Southern Sierra Nevada. 



Zone. Canadian. 



Specimens examined. Volcano Creek, above Volcano Falls, 8,000 

 feet, Culbertson (B4361); mountain slopes on Little Kern River, 

 Tulare County, 9,300 feet, Purpus 5058. 



This variety differs from the type in the reduced tomentum cover- 

 ing the twigs and in being less glandular-viscid. 



4a. Chrysothamnus nauseosus var. calif ornicus (Greene) Hall, 

 Univ. Calif. Publ. Bot., vol. 7, p. 174. 1919. 



C. californicus Greene, Erythea, vol. 3, p. 111. 1895. 



Bigelovia graveolens var. albicaulis Gray, in Brewer and Wats., Bot. Calif., 

 vol. 1, p. 317. 1876, as to the Sierran plant. 



Type locality. "Higher Sierra of Placer and Nevada Counties." 



Range. Central Sierra Nevada. 



Zone. Canadian. 



Specimens examined. Mono Pass, Bolander 6145; head of Fall 

 Creek, Ormsby County, Nevada, 2,460 m., Baker 1495; summit of 

 the Sierras near Donner Lake, E. L. Greene 411. 



This variety differs from the type in the leaves being generally 

 broader and the pubescence less developed. 



