166 NORTH AMERICAN FAI'NA. [no. 16. 



Chsenactis nevadensis (Kello<i-^) (Iray. Alpine Cha'iiactis. 



This curious cttniposite, witli whitish tubular flowers, much divided 

 sticky leaves, and a smell like that of alcoholic s])ecimens, occurs here 

 and there in the pumice sand and amonj;" the broken lava sliale above 

 tiinberline. It was tirst seen in Jlower on tlie north side of IShastina 

 July 2i (alt. 1),()()0 feet), and early in August was flowering plentifully 

 on the soutli sl()i)e of Shasta above the head <»f S(pmw Creek (alt. 

 0,;>()() feet). (Identified by I*rolessor (rreene.) 



Chrysothamnus bloomeri (Gray) Greene. 



One of the commonest and most widely distributed i)lauts of the 

 higher slopes, where it occupies pumice soils from the bottom of the 

 Hudsonian zone up to several hundred feet above timberline. It was 

 rarely found above an altitude of 9,000 feet. 



This i)lant is very long lived, and although tlie ])art above ground 

 is relatively small it springs from a large woody base resembling that of 

 the true sagebrush. The root is enormous. The main taproot (some- 

 times double) usually sinks so deeply into the soil that T was unable 

 to dig one up without breaking off the terminal point. In mature 

 plants the main root measures about 200 millimeters in circumference 

 where it enters the ground, an<l is 500 to 000 millimeters in length. It 

 gives ott" numeious sn)all and slender rootlets some of which exceed 

 GOO millimeters in length. The height of the i)lant above ground 

 rarely exceeds 150 millimeters. 



Chrysothamnus bloomeri angustatus (Gray) (ireene. 



Common at AVagon Camp and in various parts of the Transition zone, 

 usually scattered through the manzanita chaparral. Vernon P>ailey 

 collected it at Sheep Kock. (Identified by Professor (xreene.) 



Chrysothamnus occidentalis Greene. Rabbit l>rush. 



Fairly common in oi)en spots on the lower sloi)es throughout the 

 Transition zone, where it is mixed with Kunzia tridentata, Aretostaphy- 

 los iJatnJ<(, and Ceanofhus velutinns. This large white-stemmed spe- 

 cies occurs sparingly in dry soil at Sisson, and thence to I^'dgewood 

 and Sliasta Valley, in the upper edge of the Upper Sonoran zone, where 

 it is common among the sagebrush. It was obtained at Sheep l\ock 

 by Vernon Bailey. (Identifu'd by I'rofessor Greene.) 



Chrysothamnus viscidiflorus ISfutt. 



Common in the upper part of the Ui)i)er Sonoran zone in Shasta 

 Valley. (Identified by Professor Greene.) 



Erigeron armeriaefolium Turcz. 



leather common near timberline. Specimens were collected above 

 Squaw Creek, m^ar the head of Alud Creek Canyon, and on tlie north 

 slope ol Shastina. (ldenti(ic<l by Professor < Irecno.) 



