Persicaria prostrata (R.Br.) Soják

Creeping Knotweed

Preslia 46: 154 (1974) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Prostrate perennial, stems to c. 40 cm long, with sparse to rather dense, antrorse, appressed or semi-appressed hairs. Ochreas with a few hairs on sheath and at apex, the upper part of most expanded into a firm green, toothed or lobed limb. Leaves subsessile, lanceolate to narrowly elliptic, 1.5–5 cm long, 3–10 mm wide, margins and main veins with short hairs, lamina glabrous to moderately hairy. Inflorescence cylindric, rather dense, mostly 1–4 cm long, 4–7 mm diam.; peduncle 1–3 cm long; perianth segments 2–3 mm long, wholly green or with white margins, free from about midway. Nut broadly ovate, biconvex, c. 2 mm long, 1.5 mm wide, smooth and shining, dark brown or blackish. Flowers Dec.–May.

CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HNF, HSF, LoM, MuF, MuM, MSB, NIS, OtP, OtR, RobP, VAlp, VRiv, VVP, WaP, Wim. Also WA, SA, Qld, NSW, ACT, Vic, Tas (uncertain origin). New Zealand. Rather common on sandy or rocky banks of watercourses, and on heavy soils prone to inundation.

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 Persicaria
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Persicaria prostrata in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Persicaria prostrata in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Glenelg Plain 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
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Victorian Alps present native

State distribution

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