Trappa

Trapa is the only genus of the monotypic family Trapaceae, in the order Myrtle, which includes five species of aquatic herbs. They have submerged linear and floating rosette leaves, with a swollen petiole, rhombic and toothed. Inconspicuous, floating, hermaphroditic, regular, tetramerous flowers with a semi-inferous ovary. Fruits nuciform, coriaceous, with 4 horns. They are native to temperate regions of Asia and Africa.

Species

• Trap bicornis
  
• Trapa korshinskyi
  
• Trapa litwinowii
  
• Trapa maximowiczii
  
• Trapa natans