A modern reference to temperate woody plants, including updated content from this site and much new material, can be found at Trees and Shrubs Online.




A genus of one deciduous species in the south-eastern United States. From its allies Ulmus, Celtis and Zelkova, the first of which it resembles in foliage, it differs in the nut-like tubercled fruit. The genus is named after J. J. Planer, a German physician (1743-1789).

From the Supplement (Vol. V)

The specimen of P. aquatica in the Home Park at Windsor is dead.

Species articles