Xll 



North American Trees 



Ginkgo. Maidenhair Tree 



Fig. 1 — (a) Winter twig, x Yz ; (b) leaf, x Yz; (c) staminate 

 flowering branchlet, x Yz', (d) staminate flower, enlarged; {e) pistil- 

 late flower, enlarged; (/) fruit, x 1. 



