Scientific nameAldrovanda L.
Africa, Asia, Australia, Europe
Aldrovanda vesiculosa L.
information not available
not weedy, threatened
rootless stem plant floating just beneath water surface, free floating
Perennial. Stems irregularly branched. Leaves caulescent, in compact whorls of 6-9, sessile, cuneate basally, terminating in 4-6 filaments and a subapical orbicular lobe; lobe hinged along midline, its two halves close rapidly to trap prey. Inflorescence a solitary bisexual flower borne on a short axillary pedicel, opening above water surface. Flower with 5 sepals and 5 white petals. Dispersal by seeds, resting-stage turions (modified apical buds) or stem fragments.
still waters such as lakes, ponds, and swamps
This genus contains a single species, Aldrovanda vesiculosa. An aquatic carnivore, Aldrovanda is closely related to the venus flytrap (Dionaea muscipula), with the traps on Aldrovanda used to capture aquatic invertebrates. Aldrovanda is either extinct or seriously threatened in many areas of its distribution due to disturbance and pollution through eutrophication. Efforts are being made to reintroduce this plant to many regions where it is now extinct. Plants in Europe show distinct differences in morphology and abiotic preferences from Asian and Australian plants; European plants are distinctly yellow-green and prefer a temperate climate, while Asian and Australian plants are typically red and are mostly found in subtropical to tropical regions. These differences represent different populations.