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polygonaceous
CIDE DICTIONARY
polygonaceous, a. [See Polygonum.].
Of or pertaining to a natural order of apetalous plants (Polygonaceæ ), of which the knotweeds (species of Polygonum ) are the type, and which includes also the docks (Rumex ), the buckwheat, rhubarb, sea grape (Coccoloba ), and several other genera. [1913 Webster]
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