Prostrate knotweed

Polygonum aviculare, Polygonum heterophyllum

Annual, seed-propagated weed with spindle-shaped root. Depending on location P. aviculare is extremely various in habit and leaf form.
Prostrate growth, mostly branching from base, small leaves.
Cotyledons: Very long, evenly slender, bluntly pointed.
Stems: Usually prostrate, heavily ramified, leaves at the nodes up to the tip, up to 50 cm (19.5 inch) long.
Leaves: Elliptical or lanceolate to linear, pinnate-nerved, hardly petiolate, emerging from a thin, membranous, stalk-enclosing, incised tube (stipule sheath).

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