Acetosella (Meisner) Fourr.

Latin acetosellus—slightly acid or sour, referring to the taste of the leaves.

Erect perennial with spreading slender rhizomes. Leaves not jointed, stalked, mostly arrow-head shaped. Sheath papery, splitting. Sexes mostly on separate plants. Flowers in narrow clusters. Perianth segments 6, not winged, ridged or toothed, outer 3 largest. Stamens 6. Style with 3 branches at tip. Fruit a 3-angled nut enclosed in persistent perianth.

Widely naturalised cosmopolitan weeds.

4 species from temperate Eurasia.

Source: Spencer, R. (1997). Polygonaceae. In: Spencer, R.. 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.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Polygonaceae
Higher taxa
Subordinate taxa
species         Acetosella vulgaris Fourr.