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The genus contains around 200 species of thistles, including several important agricultural weeds like Cirsium arvense and Cirsium vulgare. These are often found in cereals, pastures or fields, mainly in temperature regions.
The species are herbaceous and spiny plants with the familiar pink or purple flowerhead and the small feathered seeds which have given the genus the name "plume thistles".
For details see the respective page in Wikipedia.
Currently, the following species have been entered into the system: