Planera
Planera is a genus of flowering plants with a single living species, Planera aquatica, the planertree or water elm. The genus has an extensive fossil record dating back to the Cretaceous and spanning the northern hemisphere, with a few southern hemisphere records as well. The living species is found in the southeastern United States, it is a small deciduous tree tall, closely related to the elms but with a softly, prickly nut diameter, instead of a winged seed. It grows, as the name suggests, on wet sites. Despite its common English name, this species is not a true elm, although it is a close relative of the elms. 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.
Species
- ''Planera aquatica''
Fossil species
- †Planera antiqua
- †Planera aquaticiformis
- †Planera australis
- †Planera chankaensis
- †Planera crenata
- †Planera cretacea
- †Planera dubia
- †Planera emarginata
- †Planera ezoana
- †Planera hebridica
- †Planera knowltoniana
- †Planera mullensis
- †Planera myricifolia
- †Planera parvula
- †Planera subkeaki
- †Planera thompsoniana
- †Planera ulmifolia
- †''Planera variabilis''
Species formerly included in ''Planera''
- †Abelicea ungeri
- †Cedrelospermum nervosum
- †Chaetoptelea microphylla
- †''Fagopsis longifolia''