What is the plant
The fruit is a cypsela tipped with a pappus of barbed bristles or scales. Several Carduus are notorious invasive plants outside their native range, for example, in Australia and the United States. Species such as C. acanthoides, C. nutans, C. pycnocephalus, and C. tenuiflorus easily become weedy in disturbed habitat, such as overgrazed pasture.
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