The Devil's tongue (Amorphophallus rivieri) belongs to Araceae (the Arum family). It is a perennial herb that is distributed from southern Viet Nam to eastern India. This herb was introduced into Japan in Nara Era (710-794). The corms are about 30 cm in diameter and produce the cylindrical leaf stalks 50-200 cm in height. The leaves are pedatifid compound. The terminal spadix is borne with dark purple bracts in early summer. The female flowers come at the base of the spadix and the male flowers come above it. The corms are used for the raw materials of "Konjac food" in Japan. The 15th photo shows "apple-size balls" in the second year, the 16th photo shows "third year balls" in the third year, and 17th and 18th photos show "fourth year balls" in the fourth year of planting.