PLATE XLIV. YELLOW BIRCH. 



1. Flowering branch with (s) staminate flowers, and (p) pistillate flowers, x 



2. Branch with matnre leaves and four fruiting strobiles, x J. 



3. A winged seed, enlarged. 



4. A strobile scale, enlarged. 



5. Winter branch with partly developed terminal staminate aments, x i. 



6. Section of a lateral winter twig, enlarged. 



7. Section of a terminal winter twig, enlarged. 



