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[[Image:Oca.jpg|right|240px|thumb|[[Oca]] tubers]]
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A '''tuber''', or '''stem tuber''', is a development of a [[stolon]], or above-ground [[rhizome]]{{Fact|date=February 2007}}, thickened for use as a [[storage organ]]. The tuber usually, though not always, develops when the stolon becomes [[subterranean]], such as in a [[potato]]. This modified stem forms at the end of a lateral branch. Auxiliary buds are located at the nodes. When the buds develop, adventitious roots and rhizomes form below them. This should not be confused with a [[tuberous root]], sometimes called a root tuber, such as a [[sweet potato]] or ''[[Dahlia]]''.
A short congested part; usually defined as subterranean (as of a [[rootstock]]), although this is not essential.{{SCH}}
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