Buckwheat or Smartweed Family
FORM Herbs and shrubs, many with sour juice.
Leaves simple, usually alternate with sheathing stipules.
Species 800 in our area 76 (Gray); 67 (B&B)43
Distribution Mainly temperate
Flowers in conspicuous inflourescences inconspicuous lacking petals, perianth segments 3-7, 4-9 stamens, one pistil.
#Parts 3-6 perianth segments 6-9 stamens, fruit is an achene.
Leaves simple alternate entire
There are sheaths at every point at which a leaf connects with a stem. This sheath forms a knot the source of the other family common name Knotweeds. Two main genera Polygonum, and Rumex.