Polygonaceae
Stipules ocreous, i.e. sheathing the stem Polygonaceae
Perianth segments or lobes 6, unequal
Three outer perianth segments small; inner ones larger
Flowers unisexual. Inner fruiting perianth segments scarcely longer than nut. Leaf hastate, basal lobes narrow Acetosella
Flowers bisexual. Inner fruiting perianth segments much longer than nut. Leaf shape variable, hastate to lanceolate.