PLATE XLIII. PAPER BIRCH. 



1. Flowering branch with immature leaves, (s) staminate flowers, (p) pistillate flowers, x J. 



2. Branch with mature leaves, fruiting strobiles, and partly developed staminate aments, x J 



3. A winged seed, enlarged. 



4. A strobile scale, enlarged. 



o. A winter branch with 3 partly developed terminal staminate aments, x J. 

 6. Section of a lateral winter spur-branch, enlarged, 

 t. Section of a terminal winter branch, enlarged. 



