The Frogbit (Hydrocharis dubia) belongs to Hydrocharitaceae (the Frogbit family). It is a perennial herb that is distributed from Honshu to Shikoku, Kyushu of Japan, the Korean Peninsula, Taiwan, China, Southeast Asia and Australia. This herb grows in ponds and bogs, the leaves have bladders on the reverse sides and float on the water surface. The floating leaves rise up when they grow close together. The white flowers come on the peduncles from August to October. The Japanese name is a metaphor for shiny leaves as a mirror of a soft-shelled turtle. By the way, in the Chubu region of Japan, soft-shelled turtles are called "dochi" or "tochi". In Taiwanese Mandarin, "水鱉" (water turtle).