Rachis

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1. the stem or petiole-like central axis of a pinnately compound leaf, connecting the petiolules to the petiole.
2. portion of pinnate leaf to which leaflets are attached.

cd0238-83.jpeg

cd0237-25.jpeg

rachis.JPG raceme inflorescence

The rachis is depicted in this drawing.
Source: http://www.imagedeliverysystems.com