Polygonum plebeium R.Br.

Small Knotweed

Prodr. 420 (1810) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Prostrate, often reddish-purple, annual, to c. 30 cm diam., young stems minutely verrucose along the narrow ridges. Ochreas 1.5--3.5 mm long, irregularly fimbriate at apex. Leaves oblong to very narrowly elliptic, 4–12(–18) mm long, 0.5–2 mm wide, margins usually recurved, minutely verrucose, lower surface obscurely dotted, lateral veins not apparent. Flowers in 2s or 3s in axils; perianth 1–2.5 mm long, the segments united for up to c. one-third their length from the base, mostly white or pink. Fruiting perianth not or barely enlarged. Nut with 3 more or less equal flat or slightly concave faces, c. 1–1.5 mm long, dark brown, smooth and shining. Flowers most of year.

CVU, EGU, GipP, Gold, GGr, HSF, MuF, MuM, MSB, NIS, OtP, RobP, SnM, VAlp, VRiv, VVP, Wim. All mainland States. New Zealand, Malesia, Asia. Locally common on floodplains and drying lake-beds, mostly about the Murray River downstream from near Cobram, with isolated occurrences near Natimuk, Heywood and Lara in the west, and Lake Glenmaggie in the east.

Source: Walsh, N.G. (1996). Polygonaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2019-03-29
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Caryophyllanae
family Polygonaceae
genus Polygonum
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Polygonum plebeium in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Polygonum plebeium in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Wimmera present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Scroll Belt present native
Robinvale Plains present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Northern Inland Slopes present native
East Gippsland Uplands present native
Highlands-Southern Fall present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales
Australian Capital Territory