THE WILLOWS OF OHIO. 307 



Key. 

 From lea\ 



Leaves glossy above, heavily glaucous below, mostly broad, 

 ascending so as to show their white under sides, glab- 

 rous, northern. S. glaucophylla. 

 Leaver neither glossy nor very glaucous. 



Leaves thick, ovate, with emarginate ' tomentose 



on both sides, northern. 5. adenophylla. 



Leaves thin, seldom pubescent above, lanceolate, gen- 

 erally distributed. S. cordata. 

 .vers. 

 Bract- strongly glandular, before anthesis very villous, 

 aments d< apsules green, shorl lied, medium 

 sized, northern. >'. adenophylla. 

 Bracts not glandular, tomentum quickly evanescent, pedi 

 er. 

 Br; een, obscurely serrate or entire, capsules gr< 



small, medium pedicelled. lata. 



Bracts blackening, glai it. capsules large, rostrate, 



becoming brown, long pedicelled, aments lax; 



northern. >'. glaucophylla. 



irdata Muhl. Heart leaved Willow. 



ta is the botanist's bu It is one of the 



most common and most variabl a it li which we have to 



deal, it- under no restraint of heredity and 



may assume ah; n and any char. 1 have seen 



them all the way from linear-lanceolate to orbicular, from sul>- 



laucous. Hut var- 

 an- the ; ms tin .ill united Lv the flo md 

 one cannot doubt that they all belong to a singl< 



Th ration of the ales alluded to above is parti" 



larly well marked in Salh cordata and in the rn portioi 



the or anywhere out of the range of the other 



1 1 im S. / or 5 



which it resembles much in early sprin 

 Li triable bu1 



middl 

 alv, I usuall [n I 



From the former it i 



Plate XIII 

 the 



timi 



