Parts of a stem
Leaves are attached to the plant stem at areas called nodes. An internode is the stem region between two nodes. The petiole is the stalk connecting the leaf to the stem. The leaves just above the nodes arise from axillary buds.
Source
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"OpenStax College, Stems. November 19, 2013."
http://cnx.org/content/m44702/latest/#fig-ch30_02_01
OpenStax CNX
CC BY 3.0.