622 Rydberg : Studies on the Rocky Mountain Flora 



Kansas : Osborn City, 1894, C. L. Shear, 116 ; Harper, 1888, 

 W. A. Ke Herman ; Hamilton Co., 1895, Hitchcock, 222. 



Nebraska : 1893, Rydberg, i^oja (type) ; G. D. Sweezey, 55. 

 Indian Territory : 1868, Edward Palmer, 4.4.2. 

 Colorado : Platte, Dr. James. 

 Wyoming: Platte, Fremont, Dayton, 1899, Tweedy, 20j6. 



~ 6. Sideranthus puberulus sp. no v. 



A low densely puberulent perennial, less than 1.5 dm. high : 

 Stems ascending, branched above : leaves 2-3 cm. long, pinnatifid 

 or bipinnatifid ; segments 1-5 mm., long, less than I mm. wide, 

 spinulose-tipped : heads 2-4 in a small corymb, hemispherical, 

 8—9 mm. high, 10-12 mm. broad: bracts narrowly linear-lanceo- 

 late, appressed, acute, with small herbaceous tips, finely puberu- 

 lent, but only slightly glanular : rays about 20, 8-9 mm. long and 

 about 1.5 mm. wide. 



This is perhaps nearest related to E. anstrale ; but is easily dis- 

 tinguished by the fine pubescence. 



Colorado : Salida, Mrs. C. B. Clarke, 174. 



v 7. Sideranthus turbinellus sp. nov. 



A low and bushy puberulent perennial, 1.5-2 dm. high. Stems 

 corymbosely branched and very leafy : leaves . 5-2 cm. long, pin- 

 natifid or the upper reduced and merely toothed ; segments narrow, 

 1-5 mm. long, about .5 mm. wide: heads numerous, small, hemi- 

 spherical-turbinate, 7-8 mm. high, and scarcely as broad : bracts 

 imbricated in 6-7 series, linear-lanceolate, acute, appressed gland- 

 ular-puberulent : rays 10-15, 7-8 mm. long and 1.5 mm. wide. 



Perhaps nearest related E. spinnlosiim, the species is easily 

 known by the small, somewhat turbinate heads and the dense and 

 fine pubescence. 



Idaho: Pocatello, 1892, A. Isabel Mnlford. 



PYRROCOMA Hook. 



This genus was established by Hooker in 1840, and based on 



P. carthamoides. In 1894, Professor Greene extended 

 the genus so as to include the genus Homopappus of Nuttall, the 

 difference between the two genera being only that the ligules o\ 

 the ray-flowers in the former are very small and inconspicous or 

 wanting. 



species 



