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Axis (pl. Axes)

A plant part that serves as a supportive dividing line for a more inclusive structure. Branches, stems or primary leaf veins often serve as an axis. For example, we can speak of a leaf axis or an axis of an inflorescence.
 

    Figure A.  Illustration of the term "axis" (Ribes cynosbati).

 

Figure B.  Illustration of axis of fern leaf (Asplenium platyneuron).

 

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