RvDBERG : Notes on Rosaceae 407 



To /. Tweedyi belong, besides the type, the following specimens : 

 Washington : Cascade Mountains, 1882, T. S. Braiidegee, . 

 L callida (Hall) Rydb. was transferred from Potentiila, and 



placed in ttie /. eremica group, although not so closely related to 



the other members. 



PURPUSIA 



P, saxosa is still unknown except from the type locality. Other 

 specimens hav^e been referred to this species, as for instance, Heller 

 Szgy, but this belongs to Potentilla acuminata Hall ; some others 

 belong to Potentilla saxosa Lemmon. Ivesia Baileyi may also be 

 mistaken for it. The {^w pistils on a stalked receptacle and the 

 absence of bractlets distinguish it at a glance from all three. 



COMARELLA AND StELLARIOPSIS 



These two genera were treated as in my monograph. 



New York Botanical Garden. 



