391 1 FLORA OF BOULDER, COLORADO 243 



1 1 15. H. petiolaris Nutt. Petioled sunflower. 

 Common in waste places and denuded soils throughout ex- 

 cept in the alpine region, 5100-9500 ft. (Daniels, 67). Also 

 from Eldora to Baltimore (Rydberg). 



Minnesota and Saskatchewan to Oregon ; Texas to Cal- 

 ifornia. 



1115a. H. petiolaris phenax Cockerell. 

 Boulder, the type locality (Cockerell). 



1 1 16. H. subrhomboideus Rydb. Subrhomboid sunflower. 

 Locally frequent on the mesas fronting the Flat-irons, 5700- 



6000 ft. (Daniels, 656). 



Manitoba to Montana; Nebraska to Colorado. 



1 1 17. H. pumilus Nutt. Dwarf sunflower. 



Abundant on the plains, mesas, and foothills, 5100-7500 ft. 

 (Daniels, 59). 

 Wyoming and Colorado. 



1 1 18. H. grosse-serratus Martens. Coarsely toothed sun- 

 flower. 



Lowlands and stream-flats in the plains, 5100-5400 ft. (Dan- 

 iels, 670). 



New York to Wyoming; Pennsylvania to Texas and 

 Colorado. 



1 1 19. H. fascicularia Greene [H. giganteus Utahensis D. C. 

 Eaton; H. Utahensis A. Nelson]. Utah sunflower. 



Boulder (Rydberg). 



Assiniboia to Alberta ; Colorado to Arizona. 



458. HELIANTHELLA T. & G. 



1 120. H. quinquenervis Gray. Five-ribbed false sunflower. 

 In canons and on rich mountain slopes at Eldora and along 



the Arapahoe Trail. 8600-10000 ft. (Daniels, 843). Also El- 

 dora to Baltimore (Rydberg). 



South Dakota to Idaho and Colorado. 



459. VERBESINA L. Crownbeard. 



1 121. V. exauriculata (Rob. & Greenm.) Cockerell [Verhesina 



