Click on images to enlarge
infestation (Photo: Rob and Fiona Richardson)
habit prior to flowering (Photo: Rob and Fiona Richardson)
habit in flower (Photo: Rob and Fiona Richardson)
lower leaves, with deeply-lobed margins (Photo: Rob and Fiona Richardson)
upper leaves and flower-heads (Photo: Rob and Fiona Richardson)
flower-heads with spiny floral bracts (Photo: Rob and Fiona Richardson)
close-up of flower-head (Photo: Rob and Fiona Richardson)
Berkheya rigida (Thunb.) Ewart, Jean White & B. Rees
Stobaea rigida Thunb.
Asteraceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)Compositae (South Australia)
African thistle, berkheya, berkheya thistle, Augusta thistle, Hamelin thistle
Native to southern Africa (i.e. Cape Province in South Africa).
Naturalised in some parts of southern Australia (i.e. in the coastal districts of south-western Western Australia, in Tasmania, in southern and western Victoria and in southern South Australia). This species in not yet widely distributed in Australia and is mostly represented by scattered infestations. In Tasmania it has only been reported from King Island in Bass Strait, and these populations are thought to have been eradicated.
African thistle (Berkheya rigida) is regarded as a minor or potential environmental weed in Victoria, Tasmania and Western Australia. It is a weed of sandy sites and pastures that can be locally abundant, particularly in coastal environs. It spreads via creeping underground stems and can form large colonies. This species is thought to have been introduced from South Africa in ships ballast many years ago.
African thistle (Berkheya rigida) is thought to pose a potential threat to one or more vegetation formations in Victoria, and is listed as an environmental weed in the Mornington Peninsula Shire. It has also been recorded growing in reasonably intact native vegetation in south-western Western Australia (e.g. in coastal areas near Augusta).
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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