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茎极狭,长约1m,宽约2cm,下垂,边缘具细齿,呈灰绿色,被短毛。圆锥花序大,雌花穗银白色,具光泽,小穗轴节处密生绢丝状毛,小穗由2-3花组成。雄穗为宽塔形,疏弱。花期9-10月。多年生,雌雄异株。秆高大粗壮,丛生,高2-3米。叶舌为一圈密生柔毛,毛长2-4毫米;叶片质硬,狭窄,簇生于秆基,长达1-3米,边缘具锯齿状粗糙。圆锥花序大型稠密,长50-100厘米,银白色至粉红色;雌花序较宽大,雄花序较狭窄;小穗含2-3小花,雌小穗具丝状柔毛,雄小穗无毛;颖质薄,细长,白色蒲苇,外稃顶端延伸成长而细弱之芒。染色体数2n=70(Kihara et al. 1931)。