. . . . . . . . . "Bombus citrinus" . . "Echinacea" . . "Martin R. Lucas. 2015. Bombus citrinus nectar plant Echinacea. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/5249182> 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." .