Persicaria decipiens (R.Br.) K.L.Wilson

Slender Knotweed

Telopea 3: 178 (1988) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Decumbent to erect perennial, to c. 80 cm high, stems glabrous. Ochreas ciliate at apex, glabrous or with a few coarse, appressed hairs on sheath. Leaves lanceolate, 4–15 cm long, 7–25 mm wide, usually with a dark blotch near centre, margins and main veins with short antrorse bristles, lamina glabrous; petiole to c. 1 cm long. Spikes cylindric, 2–6 cm long, 2–5 mm diam., moderately dense, erect; peduncle c. 2–6 cm long; perianth segments 2–3 mm long, deep pink, free for c. two-thirds their length. Nut ovate, biconvex or trigonous, 1.5–2.5 mm long, c. 1.5 mm wide, smooth and shining, dark brown to black. Flowers mainly Dec.–Apr.

Brid, CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HNF, HSF, MuF, MuM, MSB, NIS, OtP, OtR, RobP, Strz, VAlp, VRiv, VVP, WaP, WPro, Wim. All States. New Zealand, Malesia, Europe, Africa. Widespread and common along permanent streams and winter-wet depressions, mainly south of the Great Dividing Range, but also along the Murray River and its floodplain.

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 decipiens in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Persicaria decipiens in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Wimmera present native
Glenelg Plain present native
Bridgewater 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
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Victorian Alps present native

State distribution

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