FAGACEAE 279 



18. Q. macrocarpa Michx. In rich bottom lands: Nov. Scot. 



to Man., Wyo., Ga. and Tex. 

 Conn. Northwestern Litchfield Co., not common. 

 N. Y. Greene Co. 



Pa. Northampton, Lehigh, Delaware and Philadelphia counties. 

 Tertiary, o: Cretaceous, o: Older Formations, not common in our 

 range, 153-179 days. Sea level-1,000 ft. 



19. Q. lyrata Walt. In swamps or along streams: N. J. to Fla. 



and Mo. 



N. J. Near Riddleton, Salem Co., a region with a growing season 

 of 179 days, at about sea level and near the line between the 

 Tertiary and Cretaceous regions. 



20. Q. stellata Wang. Rocky or dry soils: Mass. to Pa., Ohio, 



Mo. and Kan., south to Fla. and Tex. 



Conn. Along the coast, decreasing and perhaps wanting inland. 



N. Y. Common on L. I. and S. I., decreasing northward to Larch- 



mont, Westchester Co. 

 N. J. Rare and local in Bergen, Hudson and (?) Warren counties, 



increasing and common southward. 

 Pa. Northampton, Chester and Delaware counties. 



Tertiary, common: Cretaceous, common: Older Formations, 

 scattered. Predominating south of the moraine. 160-204 days. 

 Sea level-350 ft. 



21. Q. alba L. Rich woods: southern Me. to Ont. and Minn., 



south to Fla. and Tex. 

 Throughout the range. 

 The following hybrids have been described and are to be looked 

 for in our range wherever both the supposed parents are known. 

 Quercus marilandica X Phellos = Q. Rudkini Britton. 

 Quercus marilandica X illicifolia = Q. Brittonii W. T. Davis. 

 Quercus Phellos X rubra = Q. heterophylla Michx. 

 Quercus Phellos X ilicifolia. 

 Quercus Phellos X triloba. 



Quercus imbricaria X marilandica = Q. tridentata Engelm. 

 Quercus alba X Prinus. 



ULMACEAE 



Fruit a dry, winged samara. I. Ulmus. 



Fruit a fleshy, juicy drupe, with a hard endocarp. 2. Celtis. 



