1) Freshwater plant 2) Genus limnobium 3) Liliopsid genus 4) Monocot genus 
(American Frogbit) L. spongia, the American Frogbit, is an aquatic perennial found from Lake Ontario to the southern United States. It produces small, glossy green, heart-shaped, floating leaves that have a spongy underside tinged with purple. Its trailing roots also have a purplish tint to them. Unnoticeable white flowers are produced.…
[n] - American frogbit
genus Limnobium noun American frogbit