"Waniguchi-so" (Polygonatum involucratum) belongs to Liliaceae (the Lily family). It is a perennial herb that is native to all over Japan, the Korean Peninsula and northeastern China. This herb grows in forests on hills and mountains, and it can reach 25-40 cm in height. The leaves are elliptic and alternate. The greenish tinged, white, tubular flowers bloom in May to June. The flower is enfolded with two bracts. The fruits are globose berries and ripen black.