|Natural range of the water elm|
Planera is a genus of flowering plants with a single species, Planera aquatica,  the planertree  or water elm. 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. It grows, as the name suggests, on wet sites. The leaves are 3–7 cm long, with a serrated margin. Despite its common English name, this species is not a true elm, although it is a close relative of the elms (species of the genus Ulmus). It is also subject to Dutch elm disease, a disease which affects only members of the Ulmaceae. It is native to most of the southeast United States. It is hardy down to Zone 7. 
- "Search results for Planera". The Plant List. Retrieved 1 March 2016.
- "Planera aquatica". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 7 October 2015.
- "Water Elm Ulmaceae Planera aquatica J.F. Gmel". Virginia Tech Department of Forestry and Environmental Conservation. Retrieved December 15, 2014.
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