WHITE POPLAR 253 



6 9 x 3 7 cm., ovate, elliptic or obovate ; narrower, 

 rounder or slightly cordate at base, acute or obtuse ; 

 sharply bi-serrate, or cut into larger teeth, or irregularly 

 incised into rounded lobes and pinnatifid, or in rare cases 

 pinnatisect and even compound at the base. Grey-arach- 

 noid when young, becoming deep green, glabrous and 

 shining above, white-tomentose beneath. Plicate when 

 young. Petioles about J the length of the limb, 1 2 cm. 

 long. Autumn leaves yellow and brown, often passing 

 through brilliant ochre, tawny yellow and even orange- 

 scarlet tints to coppery browns. 



Venation pinnate, the strong secondaries running nearly 

 straight to the margin and terminating in the teeth: most 

 of them sending out forks or branches from their outer 

 sides, which similarly end in teeth. Tertiaries fine, close 

 and transverse, leaving the secondaries at obtuse angles 

 on their inner, at acute angles on their outer sides, and 

 forming more or less developed, very delicate cross-ties and 

 network. Secondaries about -J the length of the midrib 

 apart, their outer branches prominent, especially those 

 from the lower secondaries. Tertiaries almost straight as 

 cross-ties. 



Leaves blunt- or crenate-serrate or 

 sinuate-toothed. 



$ Venation pseudo-palmate at the base; 

 irregularly and coarsely sinuate- 

 dentate, with large blunt triangular 

 teeth. Leaves not rugose. Shoots 

 not nodose. 



-T- Petioles 23 cm. long, terete or 

 comi. 



Populus alba, L. Abele. The leaves of weak shoots 

 and old trees may be rounded, rhomboid-ovate or oblong, 



