JUGLANDACEAE 269 



Pa. Monroe, Northampton, Chester and Delaware counties, pre- 

 sumably in the intervening territory. 

 Tertiary, rare or wanting: Cretaceous, not very common: Older 



Formations, increasing northward. 123-204 days. Sea level- 



1,800 ft. 



2. J. cinerea L. Rich alluvial soil or on hillsides: N. B. to 



Ont. and N. Dak., south to Del. and in the mountains to Ga., 



and Ala. ; also in Ark. 



Conn. Throughout. 



N. Y. Occasional on L. I. and S. I., increasing and common north- 

 ward. 



N. J. Reported but not definitely known from Ocean and Mon- 

 mouth counties; rare in Burlington, Mercer and Middlesex 

 counties, thence increasing and common northward. 



Pa. Luzerne, Monroe, Northampton, Bucks, Chester and Dela- 

 ware counties. 

 Tertiary, o: Cretaceous, scattered: Older Formations, increasing 



northward. 117-204 days. Sea level-1,700 ft. 



2. Hicoria Raf. (Carya Nutt.) 



Lateral leaflets falcate. 1. H. cordiformis 



Lateral leaflets not falcate. 



Bracts longer than the lobes of the staminate calyx; husk of 

 fruit freely splitting. 

 Bark close, rough; foliage scurfy or pubescent. 2. H. alba. 



Bark shaggy; foliage glabrous or pubescent. 

 Leaflets 7-9; nuts pointed at both ends. 

 Leaflets 3-5; nuts rounded or notched at base. 

 Bracts about as long as the lobes of the staminate calyx, except 

 in some specimens of H. glabra' husk not freely splitting. 

 Bark shaggy; fruit subglobose to oblong. 

 Bark not shaggy, close; fruit more or less obovoid. 



1. H. cordiformis (Wang.) Britton (H. minima Britton). In 



woods, swamps and on hillsides: Que to Minn., south to 

 Fla. and Tex. 



Throughout the range, except in the pine-barrens of N. J. and 

 east and south of them; wanting in the pine-barrens of L. I.; 

 increasing northward. 



2. H. alba (L.) Britton. In rich woods: Mass. and Ont. to Neb., 



south to Fla. and Tex. 



Throughout the range, except in the pine-barrens of N. J. and 

 L.I. 



