. . . . . . . . . "Carduus pycnocephalus" . . "Hirschfeldia incana" . . "James. 2016. Carduus pycnocephalus associated species with names lookup Hirschfeldia incana. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/2967541> 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." .