Other names: Hogweed, Knotweed.
Family: Polygonaceae (Persicaria, Dock family).Cosmopolitan.
Occurrence: A widespread and common weed. It is a common pasture and garden weed, but can grow in hard, dry areas.
Similar species: Small Knotweed is similar in habit, but is a plant of drying lake beds and similar places. Its stems are often reddish, the lateral veins on the underside of the leaves are not visible, and the leaf-edges usually curl downwards.
Photo 1: Wireweed in flower.
2: Wireweed. Growing in a cracked footpath. Castlemaine.
3: Close-up of flowers and leaves.