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WordReference Random House Unabridged Dictionary of American English © 2024buck′wheat fam′ily, - Plant Biologythe plant family Polygonaceae, characterized by herbaceous plants, vines, shrubs, and trees having stems with swollen joints, simple leaves, small, petalless flowers, and fruit in the form of an achene, and including the buckwheat, dock, knotweed, rhubarb, sea grape, and smartweed.
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