Rhizome metaphor

Rhizome
From Wikipedia, the free encyclopedia.

A rhizome is, in botany, a usually-underground, horizontal stem of a plant that often sends out roots and shoots from its nodes. They are also referred to as creeping rootstalks, or rootstocks. A stolon is similar to a rhizome, but exists above ground, sprouting from an existing stem.
Many plants have rhizomes that serve to spread the plant by vegetative reproduction. Examples are asparagus, Lily of the valley and Sympodial Orchids. The spreading stems of ferns are also called rhizomes.
A tuber is a thickened part of a rhizome that has been enlarged for use as a storage organ. They are typically high in starch. An example is the common potato.