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Weeds and Plant Identification
Prostrate knotweed - Polygonum aviculare

Plant

Flower

Seedling

Ocrea
 

 
Prostrate knotweed
Polygonum aviculare L.
Polygonaceae (Smartweed family)
 
Life cycle
Prostrate, mat-forming summer annual.
 
Leaves
Alternate, narrow oval to oblong leaves with pointed tips, smooth margins and short petioles.
 
Stems
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. 
 
Reproduction
Seeds.

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