. . . . . . . . . "Danaus plexippus" . . "Helianthus maximiliani" . . "Judith Lopez Sikora. 2013. Danaus plexippus nectar plant Helianthus maximiliani. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/420917> 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." .