February 29, 191 2 • i 



Affinis^ tridentata, arizonica, cinerascens, o^risca and can 

 escens I am prone to think may prove to be worthy local vari- 

 eties of E. trijiora, but aliena is, as I see it, too close \.o grisea 

 to warrant recognition. Such variation exists in the relative 

 lengths of the petals, calyx lobes, and calyx bractlets (even in 

 different plants of the same collection), that I feel that very lit- 

 tle dependence can be placed upon these in taxonomic questions. 

 Coniell I'niversitv, Ithaca, N. \'. 



