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
The Rachis is clearly shown in this drawing.
Source:http://www.imagedeliverysystems.com/hyperbooks/Wetland%20Science%20Institute/glossary_q_z.html