Bailey & Bailey: Woody Plants of National Parks 239 



shrubs, the leaves green and somewhat sticky, not fuzzy; wool on stems whit- 

 ish or greenish; bracts of involucre 13 to 15, with slender, usually erect tips; 

 flowers 5 to 7. (Syn. Chrysothamnus Newberryi Rydb.). 

 Occurrence. — brvce canyon, common. 



Ic. Volcano Rabbitbrush (Var. vulcanicus (Greene) Jepson). — 

 Small shrubs usually about 6 or more inches high; herbage green, somewhat 

 sticky; leaves linear, the upper scarcely equalling the flower clusters; flower 

 heads numerous, borne in long narrow clusters; flowers 5 to 7 in a head; 

 bracts of involucre 9 to 12, thin with straight pointed tips. 



Occurrence. — kings canyon : Kings River Canyon. 



Id. BoLANDER Rabbitbrush (Var. Bolanderi (Gray) Hall.) — This 

 variety is similar in appearance to Aplopappus macronema because of the 

 densely white-woolly stems and the rather broadly lance-shaped leaves, but 

 the heads are narrower and the bracts of the involucre keeled and arranged 

 in vertical rows. In Ap- 

 lopappus the bracts are 

 flatter, broader, and 

 more loosely arranged, 

 not in vertical rows. 

 From typical specimens 

 of C. Parryi this variety 

 differs in having fewer 

 flowers, only 5 to 1 1 in 

 a head, and in having 

 wider leaves which are 

 thick and rigid. Bo- 

 lander rabbitbrush is 

 known only from the 

 type locality. 



Occurrence. — yosemite. 

 rare at the eastern boundary 

 of the park, 9,000 to 10,000 

 feet: Mono Pass. 



2. Rubber Rabbit- 

 brush [Chrysothamnus 

 nauseosus ( P a 11 a s ) 

 Britt.), fig. 143. — 

 Round - topped bushes, 

 11/2 to 8 feet high 

 (rarely tree-like) , the 

 stems whitish or gray- 

 ish-cottony or f e I t y; 

 leaves 1 to 21/2 inches 

 long, broadly-linear to 

 narrowly - filiform, cot- 



Fig. 143. Rubber rabbitbrush (C/irpso- 

 ihamnus nauseosus). 



