Colocasia esculenta
The plant is actually inedible when raw because of needle-shaped raphides (calcium oxalate crystals) in the plant cells. In Japan, there are several cases of food poisoning by accidental consumption. The Ministry of Health, Labour and Welfare warned not to eat "A. odora" ("Kuwazuimo"), which looks similar to edible "Colocasia gigantea" ("Hasuimo") or "Colocasia esculenta" ("Satoimo").