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秆直立,高2—3米,直径1—2厘米,新秆绿色,无毛,除节下有白粉环外,余均无粉,老秆淡褐色或黄绿色,髓海棉状。节间长20—25厘米,圆筒形或分枝一侧基部扁,节稍隆起。秆箨厚纸质或薄革质,绿色,干后淡棕色,迟落,短于节间,背面散生长粗毛,基部较密,边缘具缘毛;箨耳镰刀状,长6毫米,宽2毫米,两面密被细毛,缝毛辐射状,长达8—10毫米;
Culms erect, 2-3 meters high, 1-2 cm in diameter, the new stalk green, glabrous, except for the section under the white powder ring, I have no powder, old stalks pale brown or yellow-green, medulla sponge. Internode length 20-25 cm, cylindrical or branched side of the base of flat, slightly bulging. Culms thickly papery or thinly leathery, green, dry-brownish, late to late, shorter than internodes, abaxially scattered growing hairs, base more dense, margin ciliate; 箨 ear falcipate, 6 mm long, 2 wide Mm, densely finely hairs on both surfaces, radiant hairy, up to 8-10 mm;