WILD BUCKWHEAT, Polygonum convolvulus L. 1, entire plant; 2, matureseed; 3, vine entwined around stem of grass. Annual, reproducing by seed. Stems smooth, slender, twining or creeping, branched at base. Leaves
alternate, heart-shaped, pointed with smooth edges. Flowers small, greenish-white, borne in clusters in leaf axils. Seeds triangular, somewhat shiny, black; often covered with a dull brown, rough hull. Found in noncultivated areas and under most cropping systems. It is often mistaken for field bindweed, but the annual habit, black, shiny 3-cornered seeds, heart-shaped leaf, and minute flowers set it apart. It is a serious weed and often reduces crop yields and quality; its seeds are difficult to remove from crop seeds.