. . . . . . . . . "Vanessa cardui" . . "Cirsium arvense arvense" . . "Joe. 2014. Vanessa cardui nectar plant Cirsium arvense arvense. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/887609> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .