. . . . . . . . . "Danaus plexippus" . . "Gomphocarpus physocarpus" . . "Jon Sullivan. 2013. Danaus plexippus associated species with names lookup Gomphocarpus physocarpus. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/963287> 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." .