Erect perennial to about 70 cm tall. Leaves to about 6 cm long, lower ones with stalk about as long as blade. Base cordate or wedge-shaped. Flower clusters separated and each with a basal leaf; spring to summer. Fruit valves 2.2-3.2 mm long with large wart covering most of surface. Fruit stalks about as long as valves and with a joint in the middle.
Europe, SW Asia
Common weed of gardens and agriculture, generally in moist areas. Naturalised in cooler parts of southern and south-eastern Australia, noxious in Western Australia.
Source: (1997). Polygonaceae. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.