Limnobium, common names spongeplant[2] and American frogbit,[3] is a group of aquatic plants in the Hydrocharitaceae described as a genus in 1814.

[4][5] It is widespread in freshwater environments in Latin America, the West Indies, and the United States.

[1][6][7][8][3] Limnobium dubium (Blume) Shäffer-Fehre - Hydrocharis dubia (Blume) Backer