. . . . . . . . . "Bombus fraternus" . . "Asclepias viridiflora" . . "Shaun Michael. 2015. Bombus fraternus pollinates Asclepias viridiflora. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/1811129> 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." .