274 FAGACEAE 



Leaves ovate, oval, or oblong, seldom obovate. 



Leaves ovate or oval, glaucous or finely tomentose 



beneath. 2. A. incana. 



Leaves oblong or slightly obovate, pale but not glaucous 



beneath; a tree. 3- -4- noveboracensis. 



Leaves glutinous when mature, introduced European species. 4. A. Alnus. 



i. A. rugosa (Du Roi) K. Koch (^4. serrulata Willd.). In wet 

 soil or on hillsides: Me. to Ohio, Minn., Fla. and Tex. 

 Throughout the range. 



2. A. incana (L.) Willd. In wet soil: Newf. to N. W. Terr., 



south to S. N. Y., Pa., and Neb. Also in Europe and Asia, 



but the Old World plant may be different from ours. 



Conn. Rare in the southeastern part of the state and along the 



coast, increasing northwestward. 

 N. Y. Rare on L. I. north of the moraine; rare in Westchester 



Co., increasing and common northward. 

 N. J. Warren, Morris and Sussex counties. 

 Pa. Luzerne, Lackawanna, Pike, Monroe, Northampton and 



Lehigh counties. 



Tertiary, o: Cretaceous, o: Older Formations, increasing north- 

 ward. South of the moraine only in Pa. 1 17-187 days. Sea 

 level-2,800 ft. 



3. A. noveboracensis Britton. Woods and thickets near the 



coast: Southeastern N. Y. ; perhaps on Nantucket. 



A rare and local plant known definitely only from its type locality. 

 Grant City, S. I.; first recorded as A. incana. 



4. A. Alnus (L.) Britton {A. glutinosa Gaertn.). In wet places: 



Mass. to southern N. Y. and N. J., west to Pa.; also near 

 Chicago. Native of Europe. 

 An occasional escape in many parts of our range; often wanting. 



FAGACEAE 



Staminate catkins globose; nut triangular. 1. Fagus. 

 Staminate catkins slender, elongate. 



Nut enclosed in a prickly burr. 2. Castanea. 



Nut seated in an open scaly cup. 3- Quercus. 



i. Fagus [Tourn.] L. 

 1. F. grandifolia Ehrh. In rich soil: Nov. Scot, to Ont. and 

 Wise, south to Fla. and Tex. 



