叶鞘（leaf sheath）

互联网2013-11-14

1434

　　叶的基部或叶柄的基部扩大形成的包裹着茎秆的节间或茎节的鞘状物。多数禾本科植物和伞形科植物，具有显著的叶鞘，它们的功能是保护茎上的幼嫩居间分生组织和幼芽，并增强茎的机械支持力。

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