538 



Rydberg: Studies on Rocky Mountain Flora 



Colorado in the range. The Texan plant referred here by him, 

 belongs to an altogether different plant. I think that Colorado 

 also should be excluded, believing that all specimens found there 

 and labeled Z. Nuttallii belong to Z. falcatus, which resembles it 

 most in general habit, but has an altogether different flower. 



