BETULACEAE 27 1 



Staminate flowers 3-6 together in the axil of each bract, with a 



calyx; pistillate flowers without a calyx. 

 Stamens 2, filaments 2-cleft, each fork bearing an anther-sac; 



fruiting bracts 3-lobed or entire, deciduous. 4. Betula. 



Stamens 4, anther-sacs adnate; fruiting bracts woody, erose or 



5-toothed, persistent. 5- Alnus. 



i. Carpinus [Tourn.] L. 



1. C. caroliniana Walt. Moist woodlands: N. S. to Fla., west 

 to Ont., Minn., Kan. and Tex. 



Common throughout the range, except in the pine-barrens of 

 N. J. and the coastal plain of L. I., there rare or wanting. 



2. Ostrya [Mich.] Scop. 



1. O. virginiana (Mill.) Willd. In dry woods: Cape Breton to 



N. Fla., west to Ont., Minn., S. Dak., Kan. and Tex. 



Conn. Throughout. 



N. Y. North of the moraine on L. I., thence increasing and 



common northward. Bloodroot Valley, S. I. 

 N. J. Burlington, Somerset and Hunterdon counties, increasing 



but not common northward; not in the pine-barrens. 

 Pa. Pike, Northampton, Lehigh, Bucks, Philadelphia, Delaware 



and Chester counties. 



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

 northward. 120-204 days. Sea level-2,900 ft. 



3. Corylus [Tourn.] L. 



Involucre of two broad laciniate bractlets. 1. C. americana. 



Involurral bractlets united, prolonged into a tubular bristly beak. 2. C. rostraia. 



i. C. americana Walt. In thickets: Me. and Ont. to Man., 

 Fla. and Kan. 



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

 south of them, and usually increasing northward. 



2. C. rostrata Ait. In thickets: N. S. to B. Col. and Oreg., south 



to Ga., Tenn. and Kan. 



Conn. Rare or wanting along the ccast; increasing but not very 



common northward. 

 N. Y. In the Highlands of the Hudson, increasing but not very 



common northward. Reported but not definitely known from 



S. I. 



