Vanessa cardui Vanessa cardui Vanessa cardui is a well-known colorful butterfly, known as the painted lady, or in North America as the cosmopolitan. "V. cardui" is one of the most widespread of all butterflies, found on every continent except Antarctica and South America. In Australia, "V. cardui" has a limited range around Bunbury, Fremantle, and Rottnest Island. However, its close relative, the Australian painted lady ("V. kershawi", sometimes considered a subspecies) ranges over half the continent. Other closely related species are the American painted lady ("V. virginiensis") and the West Coast lady ("V. annabella"). "V. cardui" occurs in any temperate zone, including
Urophora cardui Urophora cardui Urophora cardui or the Canada thistle gall fly is a fruit fly which, contrary to its common name, is indigenous to Central Europe from the United Kingdom east to near the Crimea, and from Sweden south to the Mediterranean. The Canada thistle gall fly has been introduced to North America from Europe to control the population of its host plant, Canada, or creeping thistle, which is an invasive, introduced weed in North America. The fly starts life as an egg, about one to thirty of them, laid on the stems of its host plant, the Canada thistle, "Cirsium