define stolon ,runner,rhizome and tuber
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STOLON:-a creeping horizontal plant stem or runner that takes root at points along its length to form new plants.
RUNNER:-a shoot, typically leafless, which grows from the base of a plant along the surface of the ground and can take root at points along its length.
RHIZOME:-a continuously growing horizontal underground stem which puts out lateral shoots and adventitious roots at intervals.Compare with bulb.
TUBER:-a much thickened underground part of a stem or rhizome, e.g. in the potato, serving as a food reserve and bearing buds from which new plants arise.
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