. . . . . . . . . "Papilio troilus" . . "Cephalanthus occidentalis" . . "Roger Shaw. 2014. Papilio troilus nectar plant Cephalanthus occidentalis. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/812134> 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." .