Rydberg : Studies on the Rocky Mountain Flora 503 



The species is nearest related to C. sulpJiiirca, from which it 

 differs in the narrow leaves and in being more puberulent. It 

 grows in northern Wyoming at an altitude of 2200-2700 m. 



Wyoming: Big Horn Mountains, Sheridan Co., 1899, F. 

 Tweedy, 2j^i (type) and 2j;^2 ; Headwaters of Clear Creek and 

 Crazy Woman River, 1900, Tiveedy, J400. 



Pentstemon suffrutescens sp. nov. 



Peiitstcinoii caespitosus var. suffniticosiis A. Gray, Syn. Fl. 2^ : 

 270. 1878. Not P. .w/f/7///r(W/y Dougl. 1846. 



Excellent specimens of what I take to be Gray's variety cited 

 above, which was described from imperfect material, have been 

 collected by Mr. Tweedy, and these show that the plant is nearer 

 related to P. puniilns than to P. caespitosus, but the calyx lobes 

 are broader, shorter and blunter than in that species, the corolla 

 slightly smaller and the leaves glabrous. 



Colorado : Ridgway, 1895, F. Tivecdy, ijo. 



Sambucus microbotrys sp. nov. 



A low shrub, 5-20 dm. high, glabrous throughout and with 

 pale green foliage. Leaflets ovate or rarely ovate-lanceolate, acute 

 or short-acuminate, 3-9 cm. long, mostly rounded and oblique at 

 the base, coarsely serrate : cyme thyrsoid-paniculate, small, about 

 as long as broad, about 3 cm. in diameter and of the same height ; 

 flowers whitish : fruit bright red, 4-5 mm. in diameter : seeds 

 finely punctate-rugose. 



This species is nearest related to .S. pnbciis and perhaps all 

 specimens from the southern Rockies referred to that species 

 belong here. The main distinctions from 6". pubens are the total 

 absence of pubescence and the smaller inflorescence. It grows 

 at an altitude of 1500-2700 m. 



Colorado : Bottomless Pit, and below Halfway House, Pike's 

 Peak, 1896, E. A. Bcsscy (type); Gray's Peak, 1895, P. A. 

 Rydberg; East Indian Creek, 1900, Rydberg & Besscy, jjS2 ; 

 Little Veta Mountain, jjSj. 



Chrysothamnus filifolius sp. nov. 



A small shrub, about 3 dm. high, very bushy. Bark of the 

 stems and larger branches gray and somewhat fissured, that of 

 the young branches white and shining: leaves very narrow, linear- 



