Rumex bidens R.Br.

Mud Dock

Prodr. 421 (1810) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Aquatic or semi-aquatic perennial, stems freely rooting from lower nodes, procumbent or forming sometimes extensive floating mats and then with internodes commonly strongly inflated, flowering branches ascending to c. 50 cm high. Leaves all cauline, with petioles usually shorter than lamina; lamina oblong to narrowly lanceolate, to 20 cm long, 3 cm wide, tapered to truncate at base; margins plane or weakly crisped; upper leaves reduced and often sessile. Inflorescence erect, simple or with few ascending branches, to c. 40 cm long; flower 'whorls' separated by up to c. 5 cm below, crowded above, most subtended by a leaf. Fruiting valves ovate or rhombic, 4–6 mm long, 3–5 mm wide (excluding teeth), each with 1 or 2 spreading or recurved spine-like teeth near base, and an irregular callosity in the basal two-thirds; fruiting pedicel 1.5–2 times as long as valves, jointed in the lower third. Nut c. 3 mm long. Flowers Oct.-Feb.

CVU, DunT, EGL, GipP, Glep, Gold, GGr, HNF, HSF, MuF, MSB, NIS, OtP, VRiv, VVP, WaP, Wim. Also SA, NSW, Tas. Occurs at margins of lakes, billabongs, slow-moving rivers and streams and other seasonally wet depressions, mostly in the south, scattered in northern Victoria (e.g. Swan Hill, Nathalia district, Horsham, Walwa).

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 Rumex
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Rumex bidens in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Rumex bidens in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Glenelg Plain present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Scroll Belt 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
Highlands-Southern Fall present native
Highlands-Northern Fall present native

State distribution

Distribution map
South Australia
New South Wales