. . . . . . . . . "Populus fremontii" . . "Danaus plexippus" . . "Millie Basden. 2017. Populus fremontii associated species with names lookup Danaus plexippus. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/7267893> 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." .