A herbaceous (non-woody) dicot stem is composed of an epidermis, cortex, xylem, phloem and pith. Unlike the dicot roots, dicot stems have a pith. They are also known for their vascular bundles that are isolated into a specific area of the stem. This is much different than woody dicot stem by which they have no vascular bundles. Just as in the roots and leaves of the dicots, the vascular bundles of a herbaceous dicot have large white cells, xylem, and smaller outer cells, phloem.