Cirsium arvense (L.) Scop.
Californian thistle, Canada thistle, cursed thistle, field thistle, hard thistle, perennial thistle, small-flowered thistle.
Declared Pest, Prohibited - s12
Prohibited organisms are declared pests by virtue of section 22(1), and may only be imported and kept subject to permits. Permit conditions applicable to some species may only be appropriate or available to research organisations or similarly secure institutions.