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. Vascular bundles in midribs enter the lamina at intervals, individually or in groups, to form the secondaries.