248 UNIVERSITY OF MISSOURI STUDIES [396 



Idaho to British Columbia; Colorado to Washington. 



1 146. A. tridentata Nutt. Common sage-brush. 



Barren mountain slopes near Bluebird Mine, between 

 Glacier lake and Eldora, 8500-9500 ft. (Daniels). 



Nebraska and Montana to British Columbia; Colorado 

 to California. 



472. PETASITES Tourn. Sweet coltsfoot. 



1 147. P. sagittata (Pursh) Gray. Arrow-leaved sweet 

 coltsfoot. 



Eldora to Baltimore (Rydberg). Eldora lake, May, 1910 

 (W. W. Robbins). 

 Labrador to Alaska ; Minnesota to Colorado. 



473. ARNICA L. Arnica. 



1 148. A. platyphylla A. Nels. Broad-leaved arnica. 

 Arapahoe Trail just below timberline on Arapahoe Peak, 



9000-10500 ft. (Daniels, 948). 



Montana and Idaho to Colorado. 



1 149. A. pumila Rydb. [A. parvifolia Greene]. Dwarf ar- 

 nica. 



Gregory Canon, 6600 ft. (Daniels, 903). 

 Wyoming to Colorado and Utah. 



1 1 50. A. cordifolia Hook. Heart-leaved arnica. 



In the wooded region throughout, 6000-1 1000 ft. (Dan- 

 iels, 270). Also Eldora to Baltimore; between Sunshine and 

 Ward; and Massif de V Arapahoe (Rydberg). 



Montana to British Columbia ; Colorado to California. 



1 151. A. Eydbergii Greene. Rydberg's arnica. 

 Eldora to Baltimore (Rydberg). 

 Montana to Colorado. 



1 152. A. subplumosa Greene [A. Chamissonis longinodosa A. 

 Nels.]. Subplumose arnica. 



Boulder Canon above the Falls, 7000-8000 ft. (Daniels, 537). 

 Montana to Colorado. 



1 153. A. pedimculata Rydb. Peduncled arnica. 



Under pines in the mesas south of the Chautauqua grounds, 



