Prostrate knotweed – Polygonum aviculare
Polygonum aviculare L.
Polygonaceae (Smartweed family)
Prostrate, mat-forming summer annual.
Alternate, narrow oval to oblong leaves with pointed tips, smooth margins and short petioles.
Prostrate, tough, wiry stems with distinct nodes are highly branched and mat-forming. Plants perform well in compacted areas. A membranous sheath (ocrea) surrounds the stem at the base of each petiole.
Flowers and fruit
Small, inconspicuous flowers are white to pinkish and clustered in the leaf axils. The seed is enclosed in a single-seeded, dark reddish brown, three-sided fruit.