The Picrasma (Picrasma quassioides) belongs to Simaroubaceae (the Picrasma family). It is a tall deciduous tree that is native to various parts of Japan, the Korean Peninsula, China, Taiwan and along the Himalaya. This tree grows in deciduous broad-leaved forests and it can reach 10-15 m in height. The bark is smooth and dark gray-brown. The leaves are odd-pinnate compound, with 7–15 broad-lanceolate leaflets, with a coarsely and irregularly toothed margin. The flowers are green to yellow-green with four or five sepals and petals, produced in axillary cymes in April to May. The fruit is 2-3 mericarps and ripen greenish black. The bark is used in herbal medicine as a bitter flavouring and antibacterial agent.