THE WILLOWS OF OHIO. 291 



Key. 



Leaves narrow, not over 1 cm., sometimes very long, second- 

 ary, (auxilliary) aments very much younger than the primary; 

 forming dense clumps of slender stemmed shrubs. S. interior. 



Leaves often 1.5 cm. broad or more, not long in proportion, 

 secondary aments of about the same aye as the primary, forming 

 a cymose cluster; low, bushy, not in close clumps; northern. 



S. interior wheeleri. 



Salix interior Rowlee. Long-leaved Willow, Sandbar 



Willow. 



(S. longifolia and S. iiuviatilis of the manuals in part.) 



The characteristic habit of this plant is to grow in clumps 



about 4 meter- high with a great many slender stems coming up 



close together from a common root system. Th< ms 



more slender than those of any other of our willows and 



when the species assumes this habit it may lie recognized 



msiderable distance. Unfortunately, however, it di 

 not always do so, but sometimes grows by itself as a bush or small 

 tree and then it can besl be distinguished by its leaves. 'I 

 twigs : ",- slender, thickly branched and straight ascending 



so that the stems hav< eculiar brush-like appearance which 



gives ;i pleasing softness to the landscape. The winter buds are 

 small and thi I ible th the Mack willow more or 



a- the bark is of about the same color. Main- of the 

 bud iff early in the autumn. The pla< 



uch are taken by small lateral buds which develop one on each 

 Id scar. This habit when present is characteristic. 

 It i ponsible for the number of small hes 



which out for there the < <. twigs instead of one at 



Th imetim i l 5 cm. ) and 



no1 thanlcm.wid dth throughout, 



Lr-obloi but with shallow distant spinu- 



th. When they s The venation is 



; m young leav< ribed ab 



with matted 



until very old, bu1 glabrous and 



i hey unfi ld. 



and Sat 

 Leaf) branch of 1 1 1 - i >rm of S 



fruiting amenl shown, i he other with i 



three ti mi \ 

 the dei 

 hich com 

 i he 

 the 



