Water-elm
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| Water-elm | ||||||||||||||
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Water-elm Planera aquatica is single species in the southeastern U.S.A., a small deciduous tree 10-15 m tall, closely related to the elms but with a prickly nut 10-15 mm diameter, instead of a winged seed. It grows, as the name suggests, on wet sites. The leaves are 3-7 cm long, with a serrated margin.
It is moderately susceptible to Dutch elm disease.