Leaves alternate, simple, oblique bases, stipules paired
Flowers solitary, cymose or fasiculate, bi- or unisexual, reduced, wind-pollinated
Fruit a samara or drupe
Divided into two subfamilies:
Ulmoideae - includes Ulmus (elms)
Celtodoideae - includes Celtis (hackberries)
18 genera, 150+ species
Economic importance - shade trees and lumber
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