. . . . . . . . . "Bombus terrestris" . . "Cynara cardunculus" . . "Duarte Frade. 2016. Bombus terrestris observed species association: pollination Cynara cardunculus. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/3520020> 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." .