292 ALDER BUCKTHORN : BLACK WILLOW 



fairly equidistant all the way up the midrib, and not con- 

 verging at the apex. 



Fig. 112. Buckthorn, Rhamnus Frangula, p. 291 (Wo). 



OO Venation not arcuate. Leaf elliptic- to 

 ovate-lanceolate, 3 10 cm. long, gla- 

 brescent or glaucous beneath. 



Dull deep green above, black on drying: 

 stipules broad and toothed. 



Salixnigricans,Sni. Black Willow. Shrub, very variable, 

 closely allied to and perhaps only a form of S. phylicifolia. 

 Leaf thin, 3 10 x 1*2 4'5 cm., generally elliptic, ovate- 

 oblong, cordate or lanceolate ; but may be elliptic-lanceo- 

 late, ovate or obovate, and 2 3 times as long as broad ; 

 acute or shortly acuminate ; attenuate, rounded or cordate 



