Click on images to enlarge
habit prior to flowering (Photo: Sheldon Navie)
habit in flower (Photo: Sheldon Navie)
stems and deeply-lobed leaves (Photo: Sheldon Navie)
close-up of leaf with spiny margins (Photo: Sheldon Navie)
upper leaves and young flower-heads (Photo: Greg Jordan)
older flower-heads (Photo: Sheldon Navie)
close-up of flower-head from side-on (Photo: Greg Jordan)
close-up of seeds with hairs removed (Photo: Steve Hurst at USDA PLANTS Database)
Cirsium arvense (L.) Scop.
Asteraceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)Compositae (South Australia)
boar thistle, bull thistle, California thistle, Californian thistle, Canada thistle, Canadian thistle, corn thistle, creeping thistle, perennial creeping thistle, cursed thistle, field thistle, green thistle, hard thistle, perennial thistle, small-flowered thistle, smallflowered thistle, swamp thistle
Native to Europe (i.e. Denmark, Finland, Ireland, UK, Norway, Sweden, Austria, Belgium, Czechoslovakia, Germany, Hungary, the Netherlands, Poland, Switzerland, Belarus, Estonia, Latvia, Lithuania, Moldova, western Russia, Ukraine, Albania, Bulgaria, Italy, Romania, Yugoslavia, France, Portugal and Spain) and western Asia (i.e. Afghanistan, Iran, Turkey, Armenia, Azerbaijan, Georgia and Turkmenistan).
Widely naturalised in the wetter parts southern parts of Australia (i.e. in eastern New South Wales, southern and eastern Victoria, Tasmania, south-eastern South Australia and the coastal districts of south-western Western Australia).
Also widely naturalised overseas in New Zealand, Africa, the USA (including Hawaii), Canada, Mexico, South America and the Mascarenes.
Perennial thistle (Cirsium arvense) is primarily a weed of agricultural areas (i.e. pastures and crops), roadsides, waste areas and disturbed sites in Australia, however it also spreads from these areas into native grasslands and open woodlands that have been disturbed. It is primarily of concern in cooler temperate regions and was recently listed listed as a priority environmental weed in one Natural Resource Management region.
Perennial thistle (Cirsium arvense) also appears in the Global Invasive Species Database. In other parts of the world it has been found to threaten natural communities by competing with and displacing native vegetation, decreasing species diversity, and changing the structure and composition of some habitats. For example, in the USA it invades conservation areas and is thought to be a threat to several endangered plant species.
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.
Copyright © 2016. All rights reserved. Identic Pty Ltd. Special edition of Environmental Weeds of Australia for Biosecurity Queensland.
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