. . . . . . . . . "Colias philodice" . . "Centaurea stoebe" . . "kens18. 2017. Colias philodice nectar plant Centaurea stoebe. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/8859789> 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." .