Procccdiii'^s of the Ohio State Acadciny of Science 145 



2. Some or all of the branches corky-winged, or twigs puheriilent, self- 



pruned : samara-faces pubescent. •'?. 



3. Most of the branches witli corky wing-like ridges; twigs glabrous 



or nearly so: leaves 1-3 in. long. ( '. alata. 

 3. Branches often with ctirky wing-like ridges; twigs puberulent ; leaves 

 2-5 in. long. I', racoiwsa. 



1. Ulmus americana L. W'l'ite ]"'lm. A large tree of 

 rapid growth, w ith gray flak\- bark, much cultivated in cities and 

 along roadsides. Samara ovate-oval, its faces glabrous. Wood 

 heavy, hard, flexible, and verv tough ; used for wheel-hubs, sad- 

 .;le-trees, rough cooperage and ftirniture, in boat and ship build- 

 ing, and in the construction of cars and wagons. Common on 

 bluffs and on the Ifood plains of rivers and creeks. Graceful in 

 form and verv suitable for cultivation. Newf. to Man., Fla., 

 Tex., and ( )hio. 



2. Ulmus racemosa Thom. Cork Elm. A large tree 

 with pubertilent Aotmg twigs, tlie branches or some of them with 

 corky wings. Samara oval, its margins densely ciliate. Wood 

 harder, stronger, and more durable than that of the White Elm. 

 In rich soil. Quebec to Ont., Mich., N. J-, Tenn, Neb., and Ohio. 



* U I III us CO III pest ris L. English Elm. A tree, rather py- 

 ramidal in shape, the twigs ascending, not drooping except in 

 "weeping"' forms. Samara not ciliate, nearly or quite glabrous. 

 A good timber tree. Ctdtivated, from Europe. 



3. Ulmus alata Mx. Winged Elm. A small tree, 

 branches tisually with corky wing-like ridges; twigs glabrous or 

 nearly so. Samara ol^long, pubescent on the faces. Wood very 

 compact; used for wheel htibs. In dry or moist soil. Va. to 

 Fla., 111., Ark., and Tex. 



4. Ulmus fulva Mx. Slippery Elm. A medium-sized 

 tree with rotigh grayish-brown fragrant bark and rough-pu- 

 bescent twigs. Samara oval-orbicular, pubescent over the seed. 

 Inner bark mucilaginous and medicinal. Wood hard and strong 

 but splitting easily when dry. Along streams, on flood plains and 

 on hills. Quebec to X. Dak., Fla., Tex., and Ohio. 



