146 Proceeding's of the Ohio State Academy of Science 



24. Planera Gmel. Planertree. 



Trees similar to the elms but with a nut-like fruit and the 

 flowers expanding" with the leaves. Bark of the trunk scaling ofif 

 in plates. 



I. Planera aquatica (Walt.) Gmel. Planertree. A small 

 tree with nearly glabrous leaves growing in swamps and on wet 

 banks. Ind. to Mo., Ky., N. Car., La., and Fla. 



25. Celtis L. Hackberry. 



Trees or shrubs with 2-ranked leaves and the pith dia- 

 phragmed. Fruit an ovoid or globose drupe. 

 1 . LeaA^es sharply serrate ; smooth or scabrous above ; twigs glabrous. 



especially the fruiting ones, or pubescent. C. occidentalis. 

 1. Leaves entire or few-toothed, small. C. luississippioisis. 



1. Celtis occidentalis L. Common Hackberry. A 

 medium-sized tree with rough bark. Commonly much distorted 

 with "witches brooms." Drupe sweet and edible. Self-prunes 

 the fruiting twigs in winter. Wood heavy, hard, strong, quite 

 tough, greenish-white. In dry soil and on flood plains. Quebec 

 to Man., La., X. Car., Mo., Kan., and Ohio. 



2. Celtis mississippiensis Bosc. Southern Hackberry. 

 A medium-sized tree with light gray, rough bark. LTsually in 

 dry soil. N. Car., to 111., Mo., Kan., Fla., and Tex. 



Moraceac. Mulberry Family. 



26. Morus L. Mulberry. 



Shrubs or trees with 2-ranked leaves and milky sap. Fruit 

 aggregate, berry-like. 



1 . Leaves scabrous above, pubescent beneath. M. rubra. 



1 . Leaves smooth and glabrous on both sides, or nearly so. M. alba. 



I. Morus rubra L. Red Mulberry. A small tree with 

 rough gray bark. Fruit dark purple-red, edible, delicious. Wood 

 rather heavy, hard, strong, and rather tough ; very durable in con- 

 tact with the ground, very valuable for posts ; used for farm im- 

 plements, in cooperage, "acid wood," and ship building. In rich 

 soil. Vt. and Ont., to Ohio and Mich., S. Dak., Fla, and Tex. 



