. . . . . . . . . "Iphiclides podalirius" . . "Centaurea nigrescens" . . "fausto. 2015. Iphiclides podalirius nectar plant Centaurea nigrescens. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/2702740> 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." .