or 
“a 
PO RAMHOMP WY 
EXPLANATION OF THE PLATE. 
Puate CCCCXCIL PoruLus ANGUSTIFOLIA. 
. A flowering branch of the staminate tree, natural size. 
A staminate flower with its scale, enlarged. 
. A flowering branch of the pistillate tree, natural size. 
A staminate flower with its scale, enlarged. 
A fruiting branch, natural size. 
A fruit with open valves, enlarged. 
A seed, magnified. 
- Vertical section of a seed, magnified. 
. An embryo, magnified. 
- Portion of a branch with a petiole, and stipules, enlarged. 
. A winter branch, natural size. 
