Hydrocharis is a genus of aquatic plants in the family Hydrocharitaceae described as a genus by Carl Linnaeus in 1753.

[1][2] It is widespread across much of Europe and Asia, plus a few scattered locations in Africa.

[3][4][5] It is also reportedly naturalized in parts of North America.

[6][7][8] The best known species is Hydrocharis morsus-ranae, commonly called common frogbit or European frog's-bit, and occasionally water-poppy.

The name "American frogbit" refers to another aquatic plant, Limnobium spongia.