Rydberg : Studies on the Rocky Mountain Flora 626 



9. Pyrrocoma integrifolia (Porter) Greene, Erythea, 2: 69. 1894 

 Aplopappus integrifolitis Porter; A. Gray, Proc. Am. Acad. 



16: 79. 1881. 



This species grows in meadows, at an altitude of 1000-2500 



m., from Saskatchewan to Idaho and Wyoming. 



Pyrrocoma integrifolia pumila var. nov. 



Pyrrocoma Hozvellii Rydb. Mem. N. Y. Bot. Garden, I : 382. 

 1900. Not A. Gray. 



Stem low, I dm. or less, monocephalous ; bracts shorter and 

 less acute. 



Montana : Butte, 1895, Rydberg, 2808. 



10. Pyrrocoma lanceolata (Hooker) Greene, Erythea, 2: 69. 



1894 



Donia lanceolata Hook. Fl. Bor. Am. 2 : 25. 1834. 



Aplopappus lanceolatus Torr. & Gray, Fl. N. Am. 2 : 241 . 1 842. 



The range of this species is from Saskatchewan to British Co- 

 lumbia, Nevada and Wyoming. It ascends to an altitude of 



2000 m. 



1 1. Pyrrocoma Vaseyi (Parry) 



Aplopappus lanceolatus var. Vaseyi Parry ; D. C. Eaton, King's 

 Exped. 5 : 160. 1871. 



I believe that this deserves a specific rank, as the racemose 

 disposition of the heads is accompanied with shorter, closer and 

 oblanceolate, abruptly acute bracts. It ranges from Saskatchewan 

 (according to Gray) south to Utah and Colorado. 



12. Pyrrocoma tenuicaulis (D. C. Eaton) Greene, Erythea, 2: 



69. 1894 



Aplopappus tenuicaulis D. C. Eaton, King's Exped. 5: 160. 

 1871. 



Aplopappus lanceolatus var. tenuicaulis A. Gray, Syn. Fl. 2^ : 



129. 1884. 



This grows in alkali meadows of Utah, Nevada and Oregon, 

 at an altitude of about 2000 m. 



13. Pyrrocoma acuminata sp. nov. 



A low finely villous perennial with a woody tap-root. Stems 

 several, slender, about i dm. high, monocephalous : leaves nar- 



