一年生草本茎外倾或直立，30-90厘米高，分枝，具棱，具稀的反折的皮刺沿着棱。

Herbs annual. Stems decumbent or erect, 30-90 cm tall, branched, angulate , with sparse retrorse prickles along angles.

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单棱期较高水平的GA 3具有延长抽穗期的作用，而小花分化期较高水平的IAA含量则具有缩短抽穗期的作用。

Higher GA3 content in single ridge stage might delay heading date, but higher IAA content in floret differentiation stage might shorten heading date.

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