一、形态特征常绿乔木,高达30余米,胸径60厘米,主干挺直,圆满。分枝平展,近轮状排列。树皮具较厚的柔软栓皮层而易与热区树种相区别,灰黄色,浅纵裂,表面纸状脱落,皮孔明显。小枝较粗,密被褐黄色长绒毛。叶聚生枝项,近轮状排列,薄革质,倒卵状宽披针形至倒卵状长椭圆形,长10—28厘米,宽4—8厘米,先端微突钝尖,基部窄楔形,叶上面沿中脉密生长毛,沿侧脉疏生毛。叶背粗糙无白粉, First, morphological characteristics Evergreen trees, up to 30 meters, diameter 60 cm, trunk upright, successful. Branches flattened, nearly arranged in a circle. Bark with thick soft cortex and easy to distinguish with the hot zone species, gray, light vertical split, the surface of the paper shedding, lenticel obvious. Branchlets thicker, densely brown yellow long villi. Leaves poly live branches, near the wheel-shaped arrangement, thinly leathery, obovate-broadly lanceolate to obovate-oblong, 10-28 cm long, 4-8 cm wide, apex obtusely blunt apex, base narrowly cuneate , The leaves grow densely along the midrib hair, along the lateral veins sparse hair. Rough leaves without white powder,