秆高7—14米,枝下节间圆筒形;此外节间基部扁平,长25—45厘米,径粗3—6厘米,秆壁厚5—9毫米,外表面初被自粉,无毛或近无毛;具纵脉,节下有猪皮状小凹孔;箨环木栓质,附有长2—3毫米棕色刺毛;秆环略隆起,二环近同高;节内长8—12毫米。箨鞘革质,通常长26厘米,宽12厘米,背面贴生棕褐色长2毫米之倒毛,近基部尤密,腹面无毛,具纵脉,有光泽,近先端之边缘具棕褐色纤毛,先端收缩为15—20毫米之截平 7 to 7 cm tall, branchlets cylindrical; In addition, the internode is flat, 25-45 cm long, 3-6 cm in diameter and 5-9 mm in culm wall thickness. Hairy or nearly glabrous; with longitudinal veins, section with pigskin-shaped pits; 箨 ring corky, with 2-3 mm long brown bristles; stalk ring slightly elevated, the second ring nearly the same high; section within 8-12 mm long.箨 sheath leathery, usually 26 cm long and 12 cm wide, abaxially dark brown, 2 mm long, nearly basally emarginate, glabrous veins, veined, shiny, marginally crenate-ciliate proximally apical margin , Apex contraction of 15-20 mm cut-off level