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Key of Ulmus (elms)
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1. Twigs usually bearing
corky ridges, often a small tree: Ulmus
alata
1. Twigs not with corky ridges, may be a
large tree with distinctive spreading crown: go
to 2
2. Leaves
often smooth above, cross-section of bark with alternate layers colored cream
and brown, twigs not scabrous (sandpaper-like):
go
to 3
2. Leaves like sandpaper above,
cross-section of bark more uniformly brown, twigs scabrous: Ulmus
rubra
(slippery elm)
3. Blooming in the spring,
nearly indistinguishable from U. serotina without knowing blooming time: Ulmus
americana
3. Blooming in the fall, restricted range
in south central U.S.: Ulmus
serotina (September elm)
.