atactostele

atactostele

[ə′tak·tə‚stēl]
(botany)
A type of monocotyledonous siphonostele in which the vascular bundles are dispersed irregularly throughout the center of the stem.
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The term "midrib" is preferred over "midvein" because the midrib among monocots usually contains several to many discrete and scattered veins arising independently within the atactostele.