Nelson and Kennedy — Plantae Montrosensis . 39 



than the leaves ; head about 16-flowered, 2 cm. long; involucre narrowly 

 campanulate ; bracts linear-lanceolate, 12 mm. long, slightly held together 

 by the glandular hairs on the margins: flowers orange-yellow, no rays; 

 pappus-bristles about 18, short plumose, white, 8 mm. long: achene black, 

 about 6 mm. long, narrowly oblong. 



Allied to R. scaposa Gray : abundant in loose granitic soil on Mount 

 Rose, Washoe County, Nevada at 10,000 feet. No. 1147 (type), August 

 17, 1905, P. B. Kennedy. 



Chrysothamnus monocephala. 



Very low, about 3 dm., shrubby ; branches short and rigid : stems and 

 leaves covered with a fine, short, close tomentum ; the young, new shoots 

 very densely so, appearing white, the others dark gray : leaves linear, the 

 longest about 18 mm., 1 -nerved, mucronate, the upper ones sometimes ex- 

 ceeding the inflorescence, and gradually merging into the involucral bracts : 

 heads mostly solitary, terminal, 5-6 flowered; bracts about 10, rigid, im- 

 bricated in two equal ranks, usually 1-nerved, outer ones keeled, 8-10 mm. 

 long, broadly lanceolate, with a prominent acuminate cusp, yellowish, 

 striped or mottled with purple ; covered with loose cobwebby hairs : 

 pappus-bristles numerous, of unequal lengths, the longest about 8 mm., 

 very minutely villous, light-yellow ; corolla 9 mm. long; achene densely 

 silky-villous, 3 mm. long. 



Allied to C. Nevadensis (Gray) Greene, but leaves not oblanceolate or 3- 

 nerved ; involucral bracts not 5-ranked, and tips not recurved. 



Summit of Mount Rose, Washoe County, Nevada, August 17, 1905, No. 

 1171 (type), at 10,800 feet ; also No. 097 from same place, but at 10,000 feet, 

 September 29, 1902, P. B. Kennedy. 



