Lagenandra keralensis is a remarkable species from Kerala state in southwestern India that was scientifically described in 2001. It was until recently not at all known from cultivation, but surprisingly it is offered as tissue-cultured (in-vitro) plant by the Japanese company ADA.
Lagenandra meeboldii is a very variable swamp plant from southwestern India. It occurs naturally on swampy streambanks where it is flooded during times of high water level. It can be grown permanently submerged in aquariums.
The river buttercup from Australia, Ranunculus inundatus, is also sold with the label “Ranunculus papulentus”. It is a true eye-catcher with its unique palmate fresh green leaves and its creeping growth habit.