278 FAGACEAE 



N. J. Southern Mercer and Middlesex counties, thence increasing 



and common southward. 

 Pa. Bucks, Philadelphia, Delaware and Chester counties. 



Tertiary, common: Cretaceous, less common: Older Formations, 

 scattered. Not north of the moraine. 169-204 days. About sea 

 level. 



12. Q. imbricaria Michx. Rich woods: Pa. to Mich, and Neb., 



south to Ga. and Ark. 



Pa. Lehigh and Philadelphia counties. 



Tertiary, o: Cretaceous, perhaps near Philadelphia: Older Forma- 

 tions, not common. Not north of the moraine. 179-204 days. 

 Sea level-500 ft. 



13. Q. prinoides Willd. In dry sandy or rocky soil: Me. to Minn., 



N. Car., Ala. and Tex. 



Throughout the range, apparently decreasing in the Piedmont 

 Plain of N. J. 



14. Q. Muhlenbergii Engelm. (Q. acuminata Houba; Q. Alex- 



anderi Britton). Usually in limestone soil: Ont. to Minn., 



Fla. and Tex. 



Conn. In northwestern Litchfield Co. and on or near outcrops of 



Stockbridge Limestone in the valley of the Housatonic river. 

 N. Y. Peekskill, Westchester Co., and probably on the limestone 



outcrops in the rest of the upper Hudson Valley. 

 N. J. Bergen, Warren and Sussex counties. 

 Pa. Northampton, Lehigh, Bucks and Chester counties. 



Tertiary, o: Cretaceous, o: Older Formations, predominating on 

 limestone, not common. 138-204 days. Sea level-1,000 ft. 



15. Q. Michauxii Nutt. In moist soil: S. N. J. to Fla., Ind., Mo. 



and Tex. 



N. J. Moorestown, Repaupo and Upper Pennsgrove. 



16. Q. Prinus L. In sterile soil, usually on hillsides: Me. to Ont., 



south to N. J. and Va., south in the mountains to Ga., Ala. 

 and Tenn. 

 Throughout the range. 



17. Q. bicolor Willd. (Q. platanoides Sudw.). In rich wet soil: 



Me. and Que. to Mich., south to Ga. and Ark. 



Throughout the range, except in the pine-barrens and east and 

 south of them. 



