RvDBERG : Rocky Mountain flora 13J 



lucre usually 4, oblong, acute, white-tomentose, about 8 mm. 

 long ; flowers about 4 ; lobes of the corolla linear, about 3 mm. 

 long ; pappus very copious, yellowish ; bristles scabrous ; achenes 

 hirsute-villous. 



This species grows on dry hills and tablelands up to an alti- 

 tude of 2300 m. It is nearest related to 7! inermis Nutt, but is 



distinguished by the narroAv, more or less squarrose, and pungent 

 leaves. 



Utah : Rock Creek, 1877, Palmer 26^ (type, in herb. Colum- 

 bia University). 



Colorado: Gunnison, igoi, Baker 8jj. 



J 



Arnica coloradensis sp. nov 



Perennial, about 2 dm. high and with about 3 pairs of leaves ; 

 stem villous ; basal leaves obovate, nearly sessile, sparingly pubes- 

 cent, 4-5 cm. long ; stem-leaves sessile, ovate or ovate-lanceolate, 

 5-nerved; heads often solitary or few; involucre hemispherical; 

 bracts broadly oblanceolate, acute or acuminate, often tinged with 

 purple, sparingly villous and somewhat glandular, 8-9 mm. long ; 

 rays bright-yellow, over i cm. long and 5 mm. wide ; achenes 

 finely strigose. 



This species is perhaps nearest related to A, subphimosa^ but 

 differs in the low habit, the single or few heads, and the broad 

 involucral bracts. 



Colorado : 1872, Parry (in herb, Columbia University). 



•^ Carduus Osterhoutii sp. nov. 



Stout ; stem round-angled and striate, more or less tinged 

 with purple, more or less arachnoid-hairy ; leaves pinnately parted 

 about halfway to the midrib, glabrate above, white-tomentose 

 beneath ; lobes at least of the larger leaves oblong, obtuse with a 

 weak spine; heads 2.5-3 cm. high and about 2 cm. broad ; bracts 

 arachnoid-hairy, linear-lanceolate, without glandular dorsal ridge, 

 gradually tapering into an almost erect, stout, flat spine ; pappus 



scabrous. 



Hookeriamis and C. oreophilns 



differs from both in the oblong, obtuse lobes of the larger leaves 

 and the long, stout, flat spines of the involucre. 



Colorado : Red Cliff, Eagle Co., 1902, Osterhoiit ^70^ (type) ; 



Tennessee Pass, 26^0. 



