. . . . . . . . . "Papilio polyxenes" . . "Cercis canadensis" . . "Brenda Kay Forest. 2013. Papilio polyxenes nectar plant Cercis canadensis. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/353710> 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." .