KEY TO GENERA AND SPECIES 91 



England southward and westward. (Figs. 

 169, 170.) White Oak, Quercus alba L. 



140. Deepest marginal indentations usually not 

 reaching more than i of the distance to 

 the midrib 141. 



Fig. 168. Overcup Oak. Fig. 169. White Oak. 



140. Deepest marginal indentations usually reach- 



ing | of the distance to the midrib or 

 more, at least in most of the leaves 143. 



141. Fruit-stalk much longer than the leaf-stalk. 



Southern Me. southward and westward. 

 (Fig. 171.) Swamp White Oak, Swamp 

 Oak, Quercus bicolor Willd. 

 141. Fruit-stalk shorter than the leaf-stalk 142. 



