What is "polygonaceous"

Polygonaceous \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.

a. (context botany English) Of or pertaining to a family of apetalous plants, Polygonaceae, of which the knotweeds of the genus ''Polygonum'' are the type, and which includes also the docks of the genus ''Rumex'', the buckwheat, rhubarb, sea grape of the genus (taxlink Coccoloba genus noshow=1), and several other genera.