. . . . . . . . . "Bombus impatiens" . . "Eutrochium purpureum" . . "pfp4. 2017. Bombus impatiens associated species with names lookup Eutrochium purpureum. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/7863673> 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." .