fruit-producing plant plant by taxonomy knotweed family WIKIPEDIA:Polygonaceae The *Polygonaceae* are a family of flowering plants known informally as the knotweed family or smartweed-buckwheat family in the United States. The name is based on the genus *Polygonum*, and was first used by Antoine Laurent de Jussieu in 1789 in his book, Genera Plantarum. The name refers to the many swollen nodes the stems of some species have. It is derived from Greek; poly means many and goni means knee or joint. polygonaceae smartweed-buckwheat family requires discussion