Planera aquatica,[2] the planertree[3] or water elm, is a species of flowering plant.

Found in the southeastern United States, it is a small deciduous tree 10–15 m tall, closely related to the elms but with a softly, prickly nut 10–15 mm diameter, instead of a winged seed.

[4] While often confused with true elms, it can be easily distinguished by noticing the fruit are drupes and not samaras.

[5] Typically found on alluvial floodplains subjected to seasonal or temporary flooding.

[5] Often found in swamps, streams, lakes, or in riparian areas.