POLYGONACEAE - Buckwheat Family

Herbs, shrubs, vines with swollen nodes

Leaves alternate, simple, entire, with an ocrea (stipule sheating the stem)

Flowers in a variety of infls., small, bisexual, actinomorphic

Placentation basal

Fruit lens-shaped or triangular achene

Seed with straight or curved embryo and abundant endosperm

30 genera, 1000 species, related to Caryophyllales but no betalains

Economic importance: Fagopyrum esculentum (buckwheat), Rheum (rhubarb), weeds - Polygonum (smartweed), Rumex (dock)

Diagnostic characteristics: swollen nodes, nodal ocrea, calyx in two series in some