Persicaria hydropiper (L.) Spach

Water Pepper

Hist. Nat. Vég. 10: 536 (1841) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Uncertain

Slender, more or less erect annual to c. 1 m high, stems glabrous, often gland-dotted. Ochreas ciliate at apex, glabrous or with scattered hairs on sheath. Leaves lanceolate, 5–15 cm long, 8–30 mm wide, margins and main veins with short antrorsely appressed bristles, lamina glabrous, minutely gland-dotted on at least lower surface; petiole 3–10 mm long. Inflorescence slender, cylindric, often interrupted and drooping, 4–18 cm long, 3–5 mm diam.; peduncle 3–20 mm long; perianth segments 2–3.5 mm long, pale green to white, rarely tinged pink, prominently gland-dotted, free for about two-thirds their length. Nut broadly ovate, biconvex or plano-convex, c. 3 mm long, 2 mm wide, dull and slightly roughened, dark brown. Flowers Jan.–May.

CVU, EGL, EGU, GipP, Gold, HNF, HSF, MonT, MuF, NIS, OtP, SnM, Strz, VAlp, VRiv, VVP, WaP. Also WA, Qld, NSW, ACT (naturalised), Tas. New Zealand, most of Europe. A common riparian herb in the eastern half of the State, rather rare in the west (e.g. Otway Range, Winchelsea, Kerang area), sometimes weedy, and possibly introduced. It is variously treated as native or naturalised in the other States in which it occurs.

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, 2018-03-14
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 hydropiper in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Persicaria hydropiper in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present uncertain
Victorian Riverina present uncertain
Murray Fans present uncertain
Gippsland Plain present uncertain
Otway Plain present uncertain
Warrnambool Plain present uncertain
Goldfields present uncertain
Central Victorian Uplands present uncertain
Northern Inland Slopes present uncertain
East Gippsland Lowlands present uncertain
East Gippsland Uplands present uncertain
Highlands-Southern Fall present uncertain
Highlands-Northern Fall present uncertain
Strzelecki Ranges present uncertain
Monaro Tablelands present uncertain
Victorian Alps present uncertain
Snowy Mountains present uncertain

State distribution

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