Polygonaceae

Polygonaceae
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Caryophyllales Family: Polygonaceae
Genera
Afrobrunnichia Antigonon Aristocapsa Atraphaxis Brunnichia Calligonum Centrostegia Chorizanthe Coccoloba Dedeckera Dodecahema Emex Eriogonum Fagopyrum Fallopia Gilmania Goodmania Gymnopodium Harfordia Hollisteria Knorringia Koenigia Lastarriaea Leptogonum Muconea Muehlenbeckia Nemacaulis Neomillspaughia Oxygonum Oxyria Oxytheca Parapteropyrum Persicaria Podopterus Polygonella Polygonum Pteropyrum Pterostegia Rheum Rumex Ruprechtia Stenogonum Symmeria Systenotheca Triplaris Ref: Families of Flowering Plants as of 2002-11-15

The Polygonaceae, or the Knotweed Family, are a group of dicots including buckwheat, sorrel (but not wood sorrel), rhubarb, and knotgrass. It is named for the shape of the seed; that of rhubarb, for example, has a triangular cross-section. In the Cronquist system, the Polygonaceae were given their own order, but newer systems treat them as part of the Caryophyllales.