262 



BLACK POPLAR 



Venation not strict-pinnate. Leaf neither 

 viscid-glandular, nor sharply bi-serrate. 



O Venation pseudo-palmate at the base, the 

 Lower secondaries longest : reticulation 

 marked. Buds viscous. Petioles com- 



Leaves broad, deltoid or sub-rhomboid 

 acuminate; hardly paler beneath ; mar- 

 gin cartilaginous and coarsely serrate. 

 Stomata above as numerous as beneath. 

 $ Shoots terete or nearly so. 



Fig. 95. a Black Poplar, Populus nigra ; b Populus Canadensis, 

 p. 263 (Sc). 



