Polygonaceae

Stipules ocreous, i.e. sheathing the stem Polygonaceae

Perianth segments or lobes 6, unequal

Three outer perianth segments small; inner ones larger

Flowers bisexual. Inner fruiting perianth segments much longer than nut. Leaf shape variable, hastate to lanceolate.

Leaf bases cordate, cuneate or rounded. Inner perianth segments leathery, often toothed, not inflated Rumex

Leaf bases hastate or sagittate often acute. Inner perianth segments inflated and papery Acetosa