This perennial herb is restricted to habitats at the water`s edge, where potential competitors are restricted by fluctuating water levels, disturbance or moderate exposure. It usually grows in mildly to strongly calcareous or brackish waters, over a range of organic or inorganic substrates. 0-320 m (W. of Libanus, Brecs.).
The decline of B. ranunculoides was already apparent in the 1962 Atlas, and can be attributed to the destruction of small waters and the colonisation of others by more competitive species once grazing ceases. Since then it has declined further in England but seems stable in the west of its range.
Suboceanic Southern-temperate element.