44 SALICACEAE 



Distribution. — The Heartleaf Willow is distributed widely 

 over northeastern North America, ranging from New Bruns- 

 wick southward to Maryland and westward into Manitoba in 

 the north and Kansas in the south. In Illinois, it is common in 

 most of the northern section of the state, from Lake Michigan 

 westward to the Mississippi in Jo Daviess County, and ranges 

 southward into Lawrence County in the east and Menard 

 County in the west. It is subject to attack by an insect which 

 causes the deformation of terminal buds into large, conelike 

 structures. 



It is stated by authorities that this species hybridizes freely 

 with S. sericea, less commonly with S. nigra, and resulting 

 hybrids may be expected throughout its range in Illinois. 



Collections made by E. J. Hill near Kankakee and two speci- 

 mens taken by Dr. Frederick Brendel near Peoria have been 

 referred to the variety angustata Andersson, but these speci- 

 mens are so like the general run of the species that they hardly 

 seem worth varietal segregation. It is the opinion of C. R. Ball 

 that the species is common in Indiana but that the variety does 

 not occur there. Very probably we have the same situation in 

 Illinois. The variety myricoides (Muhlenberg) Carey, thought 

 by one authority to be the hybrid of S. cordata and S. sericea, 

 is distinguished by its cinereous or canescent twigs with perma- 

 nent pubescence, elongate leaves wnth blades tapering and acute 

 at the base, sparsely appressed, small, ovate, pointed stipules 

 that are hairy beneath, and capsules at first silky but later gla- 

 brate. The range of this variety, from Massachusetts to Wis- 

 consin and south to Kansas, includes Illinois, and specimens 

 collected by V. H. Chase in Stark County, by E. J. Hill in Kan- 

 kakee County, and by Elihu Hall in Menard County seem to 

 be representative. 



SALiX GLAUCOPHYLLA Bebb 

 Blueleaf Willow Glaucous-Leaved Willow 



The Blueleaf Willow, fig. 5, is a low, spreading shrub up to 

 7 feet tall with clustered stems, stoutish branches, and leathery 

 green leaves that are densely blue-glaucous beneath. The leaf 

 blades, elliptical-lanceolate to ovate-lanceolate or even ovate, 

 are 2 to 4 inches long by ^ to Ij^ inches wide, acute to shortly 

 acuminate at the tip, acute, rounded or even somewhat cordate 



