Rydberg : Studies ox the Rocky Mountain Flora 624 



As treated by Dr. Gray, A. cartJiauioidcs comprises more thai? 

 one species, and probably both of the two following species are 

 covered by his description. There is no doubt, however, as to 

 which species shall bear the name, for Hooker's description and 

 figure point clearly to the plant with more or less spinulose- 

 toothed leaves and bracts. The latter are also longer, narrower 

 and more acute than in the other two species. P. cartJiavwides 

 ranges from Alberta and British Columbia to Oregon and Idaho. 



3. Pyrrocoma rigida sp. nov. 



A perennial with a thick woody tap-root. Stems 1—3, erect 

 or ascending, finely pubescent when young, glabrate in age, 2-4 

 cm. high, leaves pale bluish green, firm, oblanceolate, acute, entire- 

 margined, finely puberulent, or glabrate ; the lower petioled, 8-15 

 cm. long, 1.5—3 cm. wide; the upper smaller and sessile: heads 

 apparently discoid, 15-20 mm. high, 15-25 mm. broad: bracts 

 very firm, imbricated in 3-4 series, broadly oblong, acute or mu- 

 cronate ; the inner at least with broad scarious or semi-chartaceous 

 margins, which generally are erose, but not spinulose-dentate : 

 ligules of the ra)^-flowers erect, slightly longer than the light 

 brownish or sordid pappus : achenes glabrous, shining. 



In general habit, this species resembles closely P. cartliauioidcs 

 but has broader leaves and bracts, paler foliage and no indication 

 of spinulose toothing. It grows in sandy places and meadows in 

 Idaho, Montana and Washington. 



Idaho: Granite Station, Kotenay County, 1892, Sauddo-g, 

 MacDoiigal & Heller, ySj (type). 



Montana: Columbia Falls, 1894, R. S. WUliauis. 



Washington: Loomiston, 1897, A. D. E. Elmer, 6oj. 



4. Pyrrocoma erythropappa sp. nov. 



A finely villous pubescent perennial. Stem 1.5-3 dm. high, 

 with 1-4 heads : stem-leaves 3-6 cm. long, 1-1.5 cm. wide, firm, 

 oblanceolate or oblong, acute, subsessile, finely pubescent, or 

 glabrate on the upper surface : heads very short-peduncled in the 

 axils of the upper leaves, 10-15 mm. high, about 15 mm. in diam- 

 eter : bracts imbricated in 4-5 series, pubescent, broadly oval or ob- 

 long, obtuse, mucronate, or the outer acute, with a thin erose mar- 

 gin : pappus intensely brownish red : otherwise as the preceding. 



Idaho : Clear Water, Rev. Spalding (type in Torrey Her- 

 barium). 



