Click on images to enlarge
habit (Photo: Trevor James)
habit (Photo: Trevor James)
close-up of hollow stem (Photo: Trevor James)
upper leaf (Photo: Trevor James)
flower cluster (Photo: Trevor James)
close-up of flowers (Photo: Trevor James)
immature fruit (Photo: Trevor James)
Rorippa microphylla (Boenn. ex Rchb.) Hyl. ex Á. Löve & D. Löve
Nasturtium microphyllum Boenn. ex Rchb.
Brassicaceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)Cruciferae (South Australia)
brown cress, brown watercress, narrow fruited water cress, narrow-fruited rockcress, narrow-fruited watercress, narrow-fruited water-cress, one row water cress, one-row watercress, onerow yellowcress, one-rowed watercress, watercress, yellowcress
Native to Europe (i.e. Denmark, the UK, Ireland, south-western Sweden, Austria, Belgium, Czech Republic, Germany, the Netherlands, western Poland, Switzerland, northern Italy, Slovenia, France and Spain), north-western Africa (i.e. Morocco), western Asia (i.e. Iran and Afghanistan) and northern Pakistan.
Widely naturalised in south-eastern Australia (i.e. in some parts of eastern New South Wales, in the ACT, in southern and eastern Victoria and in south-eastern South Australia). Also occasionally naturalised in south-eastern Queensland and sparingly naturalised in Tasmania.
Naturalised overseas in the USA, New Zealand and Hawaii.
One-rowed watercress (Rorippa microphylla) is regarded as a minor environmental weed or potential environmental weed in Tasmania and other parts of south-eastern Australia. This semi-aquatic species generally grows in muddy sites or in shallow water. It has been recorded in conservation areas in New South Wales, including in the Nattai and Bargo Reserves (i.e. Nattai National Park, Nattai State Conservation Area and Bargo State Conservation Area) in the Blue Mountains region.
Fact sheets are available from Department of Employment, Economic Development and Innovation (DEEDI) service centres and our Customer Service Centre (telephone 13 25 23). Check our website at www.biosecurity.qld.gov.au to ensure you have the latest version of this fact sheet. The control methods referred to in this fact sheet should be used in accordance with the restrictions (federal and state legislation, and local government laws) directly or indirectly related to each control method. These restrictions may prevent the use of one or more of the methods referred to, depending on individual circumstances. While every care is taken to ensure the accuracy of this information, DEEDI does not invite reliance upon it, nor accept responsibility for any loss or damage caused by actions based on it.
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