144 Proceedino^s of the Ohio State Academy of Science 



22. Quercus acuminata (Mx.) Honda. Chestnut Oak. 

 A tree with close gray bark. Leaves oblong, lanceolate, or some- 

 times obovate, coarsely toothed with acute teeth, shining above, 

 pale and gray-tomentulose beneath, 4-6 in. long; cup sessile or 

 very short-peduncled, hemispheric; acorn ovoid about twice as 

 high as the cup, sweet and edible. Self-prunes abundantly. 

 Wood strong and durable, much like White Oak. Usually in dry 

 soil, commonly on lime stone ridges. Ont. to IMinn., Ga., xA-la., 

 Tex., and Ohio. 



23. Quercus alexanderi Britt. Alexander's Chestnut 

 Oak. A tree with gray bark, flaky, especially when old. Leaves 

 obovate or oblong-obovate, broadest above the middle, coarsely 

 toothed; cup short-stalked or sessile, shallow; acorn ovoid, z-t^ 

 times as high as the cup. Self-prunes. Vt. to Mich., and Ind. 



24. Quercus prinoides Willd. Scrub Chestnut Oak. A 

 shrub or small tree with gray bark. Leaves obovate, coarsely 

 toothed, bright green and shining above, gray-tomentulose be- 

 neath, narrowed at the base ; cup sessile, hemispheric, thin ; acorn 

 ovoid, 2-3 times as long as the cup; seed sweet and edible. Self- 

 prunes. In dr}^ sandy or rocky soil. Me. to Ohio and Minn., 

 Ala., and Tex. 



Order, LTrticales. 



Ulmaceae. Elm Family. 

 23. Ulmus L. Elm. 



Trees of rapid growth with 2-ranked inequilateral leaves, the 

 lateral veins straight and parallel. Elowers bisporangiate or im- 

 perfectly bisporangiate in clusters or racemes. Fruit a samara. 



1. Leaves very rough above; inner bark very mucilaginous; twigs 

 not corky-winged and not self-pruned, but large numbers of lateral 

 buds cut off ; samara not ciliate. U . fulva. 



1. Leaves smooth or sometimes rather rough above; inner bark not 



mucilaginous. '2. 



2. None of the branches corky-winged; twigs smooth, self-pruned by 



basal joints and by cleavage planes in the nodes of annual growth; 

 samara faces glabrous. U. americana. 

 2. None of the branches with corky ridges; twigs glabrous or nearly 

 so, not self-pruned ; samara glabrous or nearly so, deeply notched. 

 U. campestris. 



