ginger plant, (Zingiber officinale)

 herbaceous perennial plant of the family Zingiberaceae, probably native to southeastern Asia, or its pungent aromatic rhizome (underground stem) used as a spice, flavouring, food, and medicine.
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The spice has a slightly biting taste and is used, usually dried and ground, to flavour breads, sauces, curry dishes, confections, pickles, and ginger ale. The fresh rhizome, green ginger, is used in cooking. The peeled rhizomes may be preserved by boiling in syrup. In Japan and elsewhere, slices of ginger are eaten between dishes or courses to clear the palate. Ginger is used medically to treat flatulence and colic.