Sagittaria sagittifolia 慈姑

Sagittaria sagittifolia (also called arrowhead due to the shape of its leaves) is a flowering plant in the family Alismataceae, native to wetlands most of Europe from Ireland and Portugal to Finland and Bulgaria, as and in Russia, Ukraine, Siberia, Japan, Turkey, China, Australia, Vietnam and the Caucasus. It is also cultivated as a food crop in some other countries. In Britain it is the only native Sagittaria.