distal glume ca. 10 mm including awn.

1、

spikelets 3-awned (from upper glume and both lemmas); lower glume scabrid, apex 2-cleft; nodes of culm pubescent.

小穗3具芒（从上面颖片和两外稃）；粗糙的下部的颖片，先端2半裂；秆短柔毛的节。

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2、

anthers ca. 0. 8 mm; upper glume distinctly keeled and broadly winged from base to apex.

花药长约0.8毫米；上面颖片明显龙骨状和具宽翅从基部向先端。

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3、

proximal glume sometimes shorter and 3-veined.

有时的下部的颖片更短和3脉。

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4、

7 (6) lower glume of sessile spikelet linear, obscurely veined, smooth below middle.

更下部的颖片线形的无梗小穗，不明显，光滑中间以下。

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5、

upper glume equal to lower glume, boat-shaped.

等于上面颖片降低颖片，舟状。

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6、

glumes not winged on keel, ciliate; glume margins almost free; anthers ca. 1 mm.

在龙骨状，具缘毛上的颖片无翅；颖片边几乎免费；花药长约1毫米。

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7、

this is an easily recognizable species because of its spirally coiling awns and filamentous glume tips.

因为它的螺旋盘绕的芒和线状的颖片端部，这是一容易可认识的种。

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8、

lower glume of sessile spikelet smooth.

无梗小穗的更低的颖片平滑。

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9、

lower glume with long hairs exceeding glume apex.

更低的颖片具长毛超过颖片先端。

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10、

spikelets hispid; upper glume of sessile spikelet winged on keel; callus hairs ca. 2 mm.

小穗具糙硬毛；在龙骨状上具翅的无梗小穗的上面颖片；胼胝体毛约2毫米。

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11、

4 (3) lower glume of sessile spikelet laterally compressed; raceme often reduced to a triad.

无梗小穗侧面压扁的更低的颖片；总状花序通常退化至一个三人小团伙。

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12、

spikelets 3 per node; lower glume long villous, hairs extending beyond glume apex; upper lemma cordate.

每节小穗3；更低的颖片长具长柔毛，毛在颖片先端以外延长；上面外稃心形。

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13、

spikelets borne singly on the central axis; glume smooth, glossy.

在主轴线上单个忍受的小穗；颖片光滑，有光泽。

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14、

spikelets brown, obovate; upper glume puberulous, fringed only above middle.

小穗棕色，倒卵形；上面颖片被微柔毛，具流苏的只在中部以上。

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15、

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。

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16、

9 (8) lower glume of sessile spikelet deeply concave, depression with a prominent swelling at base.

深深凹的无梗小穗的下部颖片，沮丧具一突出的肿起部分在基部。

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17、

upper glume very small, usually vein less; spikelets on long capillary pedicels.

上面颖片很小，通常；在长毛细管花梗上的小穗。

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18、

panicle spike like with short racemes appressed to the axis; spikelets straight-awned; lower glume distinctly 2-keeled.

圆锥花序穗状的具短总状花序贴伏于轴；小穗直具芒；清楚的更低的颖片2翻转。

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19、

lower glume of sessile spikelet shallowly concave to almost flat, without a swelling at base.

凹的更下部的颖片的浅无梗小穗对几乎平，没有肿起部分在基部。

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20、

lower glume longer than upper glume; panicle open, branches divaricate, bearded in axils.

更低的颖片长于上面颖片；圆锥花序开阔的，分枝，具髯毛在腋处。

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