膨胀的最低的小穗轴节间和贴生的更低的颖片形成这。
This is formed by the swollen lowest rachilla internode and adnate lower glume.
雄蕊和心皮的数目偶尔也发生改变，在小穗轴的叶腋处偶尔也异位产生小花。
Occasionally, the number of stamens and carpels is altered and an ectopic floret occurs in the axil of the rachilla.
这与其小穗轴和浆片中的维管束发育不良、辅导系统不发达、浆片不易吸水与失水等原因有关。
It is because the vascular bundles in its rachilla and lodicules were undeveloped, the transport system was abnormal. and the lodicules absorbed and lost water difficultly.
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