Swollen region of an underground stem or root, usually modified for storing food. The potato is a stem tuber
, as shown by the presence of terminal and lateral buds, the eyes of the potato. Root tubers
, for example dahlias, developed from adventitious roots (growing from the stem, not from other roots) lack these. Both types of tuber can give rise to new individuals and so provide a means of vegetative reproduction
Unlike a bulb, a tuber persists for one season only; new tubers developing on a plant in the following year are formed in different places. See also rhizome
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