frogbit

frog-bit, frog's-bit

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

frogbit (countable and uncountable, plural frogbits)

1. Hydrocharis morsus-ranae, with roundish leaves and small white flowers. It is free-floating.

   Synonyms: European frogbit, common frogbit, European frog's-bit

2. An American plant, Limnobium spongia, with is also free-floating.
3. A South American plant, Limnobium laevigatum.

   Synonyms: Amazon frogbit, South American frogbit

• “frogbit”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.