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- Culms unbranched. 秆不分枝。
- Stems branched basally or unbranched. 基部的茎分枝或者不分枝。
- Culms glabrous. Culm sheath without oral setae. 秆无毛。没有口头的刚毛的竿箨。
- Stems erect, usually unbranched. 茎直立，通常不分枝。
- Stems erect, branched basally or unbranched. 茎直立，分枝或。
- Stems erect or ascending, unbranched. 茎直立或上升，不分枝。
- Stems unbranched or sometimes branched. 茎不分枝或者有时分枝。
- Stems branched apically or unbranched. 顶部的茎分枝或者不分枝。
- Stems often single or 2 or 3, unbranched. 茎通常单个的或2或3，不分枝。
- Culms robust, up to 1.5 m tall, scabrid below panicle. 粗壮的秆，可达1.;5米高，在圆锥花序下面粗糙。
- Culms up to 1.5 m; upper glume of sessile spikelet thinly pilose. 秆可达1.;5米；稀疏的无梗小穗的上面颖片具柔毛。
- Leaves, culms and spikelets glabrous except sheath margins. 叶，除鞘边缘之外无毛的秆和小穗。
- With a single unbranched stem terminating in a flower. 单一不分枝的茎终止于花。
- Tendrils unbranched or bifurcate, sometimes racemosely branched. 卷须不分枝或者二叉，有时分枝。
- Stems unbranched, short, not forming a tuber below ground. 不分枝的茎，短，在地下面不成立一块茎。
- Inflorescences unbranched, 2-10 cm, dull yellow tomentulose. 花序不分枝，2-10厘米，具黯淡黄色微绒毛。
- Culm sheaths densely setose; ligule truncate or acute. 竿箨密被刚毛；叶舌削去或锐尖。
- Inflorescences unbranched, 5-7 cm, yellowish brown tomentulose. 花序不分枝，5-7厘米，具淡黄棕色微绒毛。
- Nodes of culm shortly bearded; leaf blades tomentose. 短的秆的节具髯毛；叶片被绒毛。
- Inflorescence axillary, unbranched, male flowers 2 or 3 per bract. 花序腋生，不分枝，每苞片雄花2或3。
