Wild buckwheat – Polygonum convolvulus

Wild buckwheat plant

Wild buckwheat plant

Wild buckwheat flowers

Wild buckwheat flowers

Wild buckwheat fruit

Wild buckwheat fruit

Wild buckwheat foliage and flowers

Wild buckwheat foliage and flowers

Wild buckwheat

Polygonum convolvulus L.
Polygonaceae (Smartweed family)

Life cycle
Twining summer annual vine.

Leaves
Cotyledons are oblong-oval to linear. Leaves are alternate, hairless and heart- to triangle-shaped with a pointed tip and smooth margins.

Stems
Twining, herbaceous, smooth vines branch at the base and are less than 3 feet long. A membranous sheath (ocrea) surrounds the stem at the base of each petiole.

Flowers and fruit
Flowers are inconspicuous and green to white or pink. The seed is enclosed in a single-seeded, dull black, three-sided fruit.

Reproduction
Seeds.

Similar weeds
Mile-a-minute (P. perfoliatum L.)
Differs by having downward-pointing prickles on the stems, petioles and leaf veins.
Tartary buckwheat
[Fagopyrum tataricum (L.) Gaertn.]
Differs by having a more erect habit, arrow-shaped leaves and a grooved, hollow stem.