A lonely species living in Europa, Africa, Japan, Asia and Australia. The traps are 5 mm to 7 mm long reminding those of venus flytrap. Very fast closure. Preys: Proies : water fleas, cyclops... Digestion : enzymes. Assimilation : through glands. Active carnivrous plant.
Aquatic floating rootless plant, 10 cm to 50 cm long. Green transparent leaves, arranged in verticil along a stem. Flowering: 7/8, small white flowers above the water. Winter dormancy.