. . . . . . . . . "Papilio troilus" . . "Asclepias syriaca" . . "Chuck Sexton. 2008. Papilio troilus nectar plant Asclepias syriaca. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/1930894> 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." .