\Pol`y*go*na"ceous\, a. [See {Polygonum}.] (Bot.)
Of or pertaining to a natural order of apetalous plants
({Polygonace[ae]}), 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.