Central and South America
Hydrocleys martii Seub.
H. nymphoides (Humb. & Bonpl. ex Willd.) Buchenau
Hydrocleys nymphoides is found in Australia, New Zealand, North America, and several Asian countries.
Hydrocleys nymphoides is a significant weed in several countries.
creeping or floating stoloniferous plant with floating or emergent leaves
Perennial. 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.