. . . . . . . . . "Echinargus isola" . . "Aphanostephus riddellii" . . "ellen hildebrandt. 2016. Echinargus isola nectar plant Aphanostephus riddellii. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/3072339> 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." .