Central and South America
Species commonly cultivated
Hydrocleys martii Seub. (South America)
H. nymphoides (Willd.) Buchenau (North and South America)
Hydrocleys nymphoides is found in Australia, North America, and several Asian countries.
Hydrocleys nymphoides is considered a potential weed in Australia, but no records exist showing this plant to be a problem weed to support this suspicion.
creeping or floating stoloniferous plant with floating or emergent leaves
Perennial, stoloniferous. Stem creeping, typically floating. Leaves floating or emergent, basal or in clusters along stem; petioles with transverse septae; leaf blade entire, ovate to suborbicular, venation palmate, midvein distinctive; base cordate. Seedlings with submersed, linear leaves. Flowers showy, axillary, solitary, pedicellate; sepals 3; petals 3, white or yellow; stamens numerous. Fruit linear, with numerous seeds. Dispersal by seeds or stem fragments.
still waters and swamps
Hydrocleys contains at least six species, although only two species are commonly cultivated worldwide for the pond plant trade.