frogbit

The English word “frogbit” has 3 meanings listed here.

noun

Hydrocharis morsus-ranae, with roundish leaves and small white flowers. It is free-floating.
An American plant, Limnobium spongia, with is also free-floating.
A South American plant, Limnobium laevigatum.

From frog + bit, perhaps to explain the notched petal tips.

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