A horizontal underground stem is a rhizome.
Rhizomes are also called root stalks. They are the underground growth of plants from which the parts which grow above the ground develop. A rhizome usually grows perpendicular to the direction of the force of gravity, i.e. they grow horizontal.
Characteristics of rhizomes
- These are non-green with distinct nodes and internodes.
- There are auxiliary as well as apical buds. These are brownish.
- The common types of rhizomes are fleshy due to the storage of food material.
- The rhizome rootstock grows vertically upwards instead of horizontal.
some examples of rhizomes
- Alocasia indica