WINTER KEY TO THE SPECIES OF ULMUS 
a. Buds conspicuously rusty-tomentose; twigs more or less 
pubescent; inner bark very mucilaginous when chewed.... 
Mela aaes NN WaNonaneuedenn aaa ane U. fulva, p. 125. 
aa. Buds not conspicuously rusty-tomentose; twigs glabrous; 
inner bark not mucilaginous. 
tb. Bundle-scars usually 3; buds % inch long, glabrous; twigs 
without corky ridges; outline of tree vase-shaped........ 
ope aarad. ok tateratalaeaiobyamnlee es slelan U. americana, p. 127. 
bb. Bundle-scars usually 4-6 in a curved line; buds % inch 
long, somewhat pilose; twigs often with corky ridges; 
outline of tree narrow-oblong........ U. racemosa, p. 129. 
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