. . . . . . . . . "Bombus citrinus" . . "Verbesina alternifolia" . . "Martin J. Calabrese. 2015. Bombus citrinus host Verbesina alternifolia. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/8998553> 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." .