Marsilea polycarpa

Marsilea minuta, or dwarf waterclover is a species of aquatic fern in the Marsileaceae family. Not to be confused with Marsilea minuta E.Fourn. 1880, which is a synonym for Marsilea vestita. Other common names include gelid waterklawer, small water clover, airy pepperwort, and pepperwort, though the lattermost also applies to plants in the genus Lepidium. In French it is called marsilea à quatre feuilles (literally "four-leafed marsilea") and petite marsilée (literally "little Marsilea"), the latter appearing...