FAGACEAE 



275 



Throughout the range always increasing northward and decreas- 

 ing in size and number in the pine-barrens; wanting in the middle 

 of them. 



2. Castanea [Tourn.jHill. 



Leaves densely tomentose beneath; small tree or shrub. 

 Leaves smooth on both sides; large forest tree. 



C. pumila. 

 C. dentata. 



i. C. pumila (L.) Mill. In dry soil: N. J. to Ind., south to Fla., 

 Mo. and Tex. 

 N.J. Mercer, Camden, Gloucester and Salem counties, exclusively 



north and west of the pine-barrens. 

 Pa. Chester and Delaware counties. 



Tertiary, o: Cretaceous, not very common: Older Formations, 

 confined to Chester Co., Pa. Not north of the moraine. 176-204 

 days. About sea level. 



2. C. dentata (Marsh) Borkh. Rich woods or in dry ground: 

 Me. to Ont. and Mich., south to Del. and in the mountains 

 to Ala. and Miss., west to Ind. and Ark. 



Throughout the range except in southern N. J. and the pine- 

 barrens, there rare and local or wanting. A burless variety has been 

 collected in Greene Co., N. Y. 



3. Quercus L. 



Leaves or the lobes bristle-tipped; fruit maturing the second 

 season. 

 Leaves pinnatifid or pinnately lobed. 



Leaves pinnatifid or pinnately lobed, usually deeply so. 

 Leaves green on both sides. 



Cup saucer-shaped, broader than deep. 

 Cup 16-30 mm. broad; leaves dull. 

 Cup8-l6mm. broad; leaves shining above. 

 Cup top-shaped, to hemispheric or deeper. 

 Inner bark of tree bright orange, leaves 



hairy on the veins. 

 Inner bark yellow or reddish, not orange. 

 Leaves pale beneath (northern tree). 

 Leaves shining both sides. 

 Leaves white or gray-tomentulose beneath. 

 Large trees; leaf-lobes long, lanceolate. 



Leaves rounded or obtuse at base, 3-7 



lobed. 

 Leaves cuneate, acute or truncate at base, 

 5-13 lobed. 

 Small tree or shrub; leaf lobes triangular, short. 

 Leaves 3-5 lobed above the middle; obovate or spatu- 

 late. 



6. Q. triloba. 



7. Q. pagodaefolia. 



8. Q. ilicifolia. 



