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

Hairy Knotweed

Telopea 3: 180 (1988) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Rhizomatous perennial, stems ascending to erect, to c. 1 m high, sparsely to densely covered with coarse appressed hairs. Ochreas long-ciliate at apex, appressed-pubescent on sheath. Leaves narrowly lanceolate, 6–15 cm long, 5–15 mm wide, subsessile, lamina sparsely to moderately densely covered with short, subappressed bristles. Spikes cylindric, 3–8 cm long, 4–10 mm diam., dense to rather loose, sometimes interrupted near base; peduncle c. 2–8 cm long, sometimes forked; perianth segments 2.5–4 mm long, white to pale pink, free from half to two-thirds their length. Nut ovate, biconvex or obscurely trigonous, 2.5–3 mm long, c. 2 mm wide, smooth and shining, blackish. Flowers Jan.–Apr.

CVU, EGL, EGU, GipP, HFE, HNF, HSF, OtP, OtR, Strz, VVP, WaP. Also WA, Qld, NSW, Tas. New Guinea, New Caledonia. Occasional along streams, chiefly in the south-east, rather rare in the west (e.g. Gellibrand River, Ballarat area), often in cool forested areas.

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 subsessilis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Persicaria subsessilis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Central Victorian Uplands 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
Strzelecki Ranges present native
Highlands-Far East present native

State distribution

Distribution map
Western Australia
New South Wales