. . . . . . . . . "Echinargus isola" . . "Veronicastrum virginicum" . . "Erin Faulkner. 2016. Echinargus isola nectar plant Veronicastrum virginicum. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/3766966> 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." .