Concept
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Stem Anatomy
Parenchyma cells in plants
The stem of common St John's Wort (Hypericum perforatum) is shown in cross section in this light micrograph. The central pith (greenish-blue, in the center) and peripheral cortex (narrow zone 3–5 cells thick, just inside the epidermis) are composed of parenchyma cells. Vascular tissue composed of xylem (red) and phloem tissue (green, between the xylem and cortex) surrounds the pith.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Stems. October 17, 2013."
http://cnx.org/content/m44702/latest/Figure_30_02_02.jpg
OpenStax CNX
CC BY 3.0.