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.
Very long, evenly slender, bluntly pointed.
Usually prostrate, heavily ramified, leaves at the nodes up to the tip, up to 50 cm (19.5 inch) long.
Elliptical or lanceolate to linear, pinnate-nerved, hardly petiolate, emerging from a thin, membranous, stalk-enclosing, incised tube (stipule sheath).