Stipule

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1. an appendage at the base of the petiole, often in pairs and sometimes called auricles (ears).

cd0238-24.jpeg

stipule.jpg

Here, the stipule can be seen as a sheath at the base of the petiole.
Source: http://www.csdl.tamu.edu

stipule.JPG

Stipulate base
Source: http://www.hcs.ohio-state.edu/hcs300/glossary/leafpart.htm#base