Eucommia is a deciduous tree, up to 20 meters high, 50cm in diameter, and with spherical crown. Eucommia ulmoides bark is dark gray. Branches have flaky marrow. All parts show silvery white plastic wire after broken. Branchlets is smooth and with no terminal bud. Eucommia leaf is single, alternate, elliptic, 7 to 14cm long, serrated, pinnately veined, and without stipules. Flowers, growing in bract at the base of young branches, are unisexual, dioecious, and with no perianth. Samara is flat, oblong, 2-lobed at the apex, and with one seed only. It blooms from April to May, along or prior to the blossom of bract. And it fruits from October to November. Main habitat is montane forest. But now most of them are from cultivation and distributed in the middle Yangtze River, the southern provinces, Henan, Shaanxi, Gansu and other places.