Australian painted lady significantly affected by these changes. It has been found to use some species of carduine thistles, which are invasive to Australia, as host plants in New South Wales. Australian painted ladies use the plants as hosts during their larval stage, and as food sources. However, they inflict little damage to the plant. Australian painted lady The Australian painted lady ("Vanessa kershawi") butterfly is mostly confined to Australia, although westerly winds have dispersed it to islands east of Australia, including New Zealand. Debate surrounds the taxonomy of this species. Some believe that the Australian painted lady should be a subspecies of
Australian painted lady to lowered temperatures. This demonstrates the phenotypic plasticity, or the tendency for visible traits to vary with changing environmental conditions, of the painted lady butterflies. It also suggests that the painted lady is the ancestral form, and environmental stress slowly drove speciation by adaptation into the Australian painted lady. In other words, the Australian painted lady most likely evolved from the painted lady due to the environmental conditions in Australia. The Australian painted lady's distribution is restricted to Australia. The closely related "V. cardui" is found throughout the rest of the world, so the two species have an allopatric distribution.