落叶大乔木,高25￣40m。干耸直,皮层厚,韧皮纤维发达,具板根和短粗的圆锥状皮刺;大枝轮生,近平展,树冠广伞形。叶互生,掌状复叶,小叶5￣7片,长椭圆形或长椭圆状披针形,长10￣20cm,全缘。花大,直径10￣12cm,单生或成束散生于小枝上;花萼杯状,5浅裂;花瓣5,红色或橙红色;5体雄蕊。 Deciduous trees, 25 ~ 40m high. Dry sensation, cortical thick, bast fiber developed, with a flat root and short conical prickles; branches whorled, nearly flat, crowned umbrella crown. Leaves alternate, palmate compound leaves, leaflets 5 to 7 pieces, long oval or oblong lanceolate, 10 ~ 20cm long, entire. Flowers large, 10 ~ 12cm in diameter, solitary or in bundles scattered on branchlets; calyx cupular, 5-lobed; petals 5, red or orange-red;