625 Rydberg : Studies on the Rocky Mountain Flora 



5. Pyrrocoma Cusickii (A. Gray) Greene, Erythea, 2 : 59. 1894 

 Aplopappus cartliamoides var. Cusickii A. Gray, Syn. Fl. 2' : 



126. 1886. 



The range of this species is limited to Oregon and western 

 Idaho. 



6. Pyrrocoma crocea (A. Gray) Greene, Erythea, 2 : 69. 1894 

 Aplopappus croceus A. Gray, Proc. Acad. Sci. Phila. 1863 : 65. 



1864. 



This species is not uncommon in the mountain regions of 

 Colorado at an "altitude of 1800-3000 m. 



7. Pyrrocoma dementis sp. nov. 



A perennial with more or less villous ascending stem, 1.5—4 

 dm. high: lower stem-leaves linear-oblong, about i dm. long, 

 somewhat fleshy, glabrous except the ciliate margin, saliently den- 

 tate ; the upper lanceolate or ovate-lanceolate, more or less auricled 

 at the base, dentate or entire-margined ; heads solitary ; disk about 

 I 5 mm. high and 2.5—3 cm. broad : bracts all foliaceous, imbricated 

 in 3—4 series, but the outer almost equaling the inner, oblanceolate, 

 abruptly acute, villous : rays 10-12 mm. long and 2—3 mm. wide, 

 bright yellow : achenes sparingly strigose-hirsute : pappus yellow- 

 ish white. 



Colorado : Mt. Harvard, 1896, Frederick Clements, ././. 



8. Pyrrocoma villosa sp. nov. 



A low perennial with a thick woody tap-root. Stems 1-3, as- 

 cending, I — 1.5 dm. high, purplish, more or less villous, especially 

 above : basal leaves oblanceolate, 7-10 cm. long, 1-1.5 cm. wide, 

 somewhat glaucous and rigid, entire-margined or occasionally 

 slightly spinulose denticulate ; stem-leaves linear-lanceolate, 2-4 

 cm. long : heads solitary : disk about 2 cm. broad : bracts foliace- 

 ous, imbricated in 3-4 series, but the outer fully as long as the inner, 

 broadly linear or lanceolate, long-acute, more or less villous : rays 

 about I cm. long and 2 mm. wide : achenes glabrous : pappus 

 dirty white. 



In habit this species resembles most P. nniflora and P. inuloides ; 

 but is easily distinguished by the larger heads and the foliaceous 

 bracts in several series. It grows in meadows at an altitude of 

 about 2700 m. 



Wyoming: Willow Creek, Big Horn Mountains, 1899, F. 

 Tweedy, 2o6j. 



