Rapistrum rugosum (L.) All.

Giant Mustard

Fl. Pedem. 1: 257 (1785) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Stems erect, 15–90 cm high, somewhat glaucous, hairs scattered to frequent, coarse. Lower leaves to 25 cm long, lateral lobes usually of 3 pairs, margins irregularly toothed. Sepals c. 3 mm long; petals 5–10 mm long. Fruit erect to appressed or slightly spreading, 5–10 mm long (including beak), breaking between the upper and lower segments, variably hairy; lower segment c. 3 mm long, less than 1 mm wide if sterile or to 1.5 mm if fertile; upper segment 3–6 mm long, 3–4 mm wide, wrinkled, ribbed; beak narrow, conical, 1–3 mm long; pedicel 2–5 mm long; upper seed c. 2 mm diam., light brown. Flowers mainly summer–autumn.

*CVU, *EGL, *GipP, *GGr, *HSF, *LoM, *MuF, *NIS, *OtP, *RobP, *Strz, *VRiv, *VVP. Also naturalised SA, Qld, NSW, Tas., much of Europe. Native from Mediterranean to the Black Sea. Scattered in mostly western Victoria, usually on disturbed soils.

Fruit shape is extremely variable but always characteristic with its two differently shaped segments.

Source: Entwisle, T.J. (1996). Brassicaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Updated by: Daniel Ohlsen, 2017-06-06
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Rosanae
order Brassicales
family Brassicaceae
genus Rapistrum
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Rapistrum rugosum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Rapistrum rugosum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present introduced
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Robinvale Plains present naturalised
Murray Fans present naturalised
Gippsland Plain present naturalised
Otway Plain present naturalised
Central Victorian Uplands present naturalised
Greater Grampians present introduced
Northern Inland Slopes present introduced
East Gippsland Lowlands present introduced
Highlands-Southern Fall present naturalised
Strzelecki Ranges present naturalised

State distribution

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