1921] BALL—WILLOWS 225 
SALIX CAUDATA parvifolia, n. var.—-In the northern part of the 
range of S. caudata is found a form of lower stature and with 
Fic. 1.—Portion of type specimen of Salix caudata parvifolia n. var. (nat. size) 
shorter, narrower leaves (fig. 1). It occurs rather commonly and 
appears to be the dominant form in the mountains of northwestern 
