THE WILLOWS OF OHIO. 265 



Leaves sharply serrate, showing a decided tendency 

 to blacken in drying, aments from pussies, 

 bracts small or none, capsules when long 

 conic, thinly pubescent; lowland shrubs. 



Sericeae. 

 Capsules blunt, short pedicelled, short conic, 

 densely silvery silky ; leaves dull above, 

 lustrous sericeate below, at least till old. 



5. sericea. 

 Capsule long conic, long pedicelled, sparsely pu- 

 bescent; leaves shining above, glaucous be- 

 low, glabrous (or rusty sericeate when 

 young); northern. S. petiolaris. 



Style very long, capsule short conic, silky, white; leaves 

 long and narrow, revolute with veins prominent 

 below and depressed above, not distinctly arching, 

 snowy tomentose below; wet prairie shrub not 

 more than a meter tall; northern. 5. Candida. 



Capsules glabrous, styles short, filaments glabrous. 



Filaments distinct to the base; leaves sharply serrate, 



good sized shrubs. Cordatae. 



Leaves dull on both sides, only a little paler beneath 



Leaves thickly pubescent on both sides alike, short 

 and broad, bracts broad, remaining green; north- 

 ern. 5. adenophylla. 



Leaves thinly pubescent with most of the hair on 



the veins beneath, or glabrous, green on both 

 sides or slightly glaucous beneath, lanceolate, 

 bracts narrow, remaining green. S. cor data. 



Leaves -lossy above, very glaucous below, glabrous, 

 generally broad, bracts narrow; turning black; 

 northern. >'. glaucophylla 



Filaments frequently united a1 the base, capsule long 



pedicelled in fruit, leaves small, entire, purplish 



een, conspicuously reticulated; low shrub in 



i.ignuni bogs, S. pedicellaris. 



Stamen I, formed by the coalescence of 2, anthers i. scales 

 black, reflexed in staminate flower, capsules rarely seen, 

 hort , thick, hairy ; leaves oblanceolate, opposite or scattered, 

 purplish; shrub with long slender branche 



Synandrae. S. purpurea. 



