- Polygonaceae, family Polygonaceae, buckwheat family - a family of plants of order Polygonales chiefly of the north temperate zone; includes the buckwheats
--1 is a kind of dicot family, magnoliopsid family
--1 is a member of Polygonales, order Polygonales
--1 has members:Polygonum, genus Polygonum; Fagopyrum, genus Fagopyrum; genus Eriogonum; Rheum, genus Rheum; Rumex, genus Rumex