. . . . . . . . . "Papilio polyxenes" . . "Vernonia" . . "Martin R. Lucas. 2016. Papilio polyxenes nectar plant Vernonia. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/5433017> 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." .