Rydberg : Studies on the Rocky Mountain Flora 622 



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

 W. A. Kellcrman ; Hamilton Co., 1895, Hitchcock, 222. 



Nebraska : 1893, Rydberg, i^oja (type) ; G. D. Szceczey, jj. 

 Indian Territory: id>6?>, Edzvard Fahtier, 44.2. 

 Colorado : Platte, Dr. James. 

 Wyoming: Platte, Fremont, Dayton, 1899, Tweedy, 2oy6. 



6. Sideranthus puberulus sp. nov. 



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. australe ; but is easily dis- 

 tinguished by the fine pubescence. 



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



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. spinulosnm, the species is easily 

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

 fine pubescence. 



Idaho: Pocatello, 1892, A. Isabel Midford. 



PYRROCOMA Hook. 



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

 one species, P. carthainoides. In 1 894, 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 of 

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

 wanting. 



