TAXONOMY 
3 T 7 
(petiole). I he margins of the chestnut and beech leaves are sharply 
cut with large teeth. The leaves of the oaks divide the genus into 
two groups, viz.—the white oaks with rounded lobed leaves and 
Pig. 178 .—Quercus infectoria —Branch and nutgall. (Sayre.) 
annual acorn production, and the black oaks with sharp bristle- 
tipped lobes and biennial acorn production. The male flowers are 
in dangling heads (beech), or in catkins (chestnut and oaks). The 
