Hottonia inflata is a winter annual aquatic herb to 50 cm long, usually submersed, growing in Autumn and winter, blooming in spring, stems hollow, swollen.
Leaves to 6 cm long, deeply pinnately divided, segments linear, all densely clustered at top of stem.
Flowers white, tubular, sepals 5, to 1 cm long, petal tube to 0.5 cm; inflorescence of clusters at nodes of upper stem; blooms April-June.
Fruit a rounded capsule.
Wetland status: OBL.
Frequency in NYC: Very infrequent, rare (G4, NYS S1S2, T).
Habitat: Quiet, clean water, swamps.