RHIZOME
a rootstock that is actually a stem or branch, but grows entirely beneath the surface of the ground, or, in most orchids, creeps along the substratum
The following is a list of rhizome plants according to type of storage organ. Rhizomes are thick, fleshy, horizontal underground stems. Some rhizomes may lie directly on the soil surface (bearded iris). Foliage, roots and flowers grow from buds on the rhizome. Rhizomes generally creep or spread, unlike tubers. Rhizomes are usually divided so pieces contain at least one fan or group of foliage and significant amount of roots. Examples include: Iris Oxalis Zantedeschia (Calla Lily) .