. . . . . . . . . "Polygonia interrogationis" . . "Humulus lupulus" . . "Rob Curtis. 2015. Polygonia interrogationis host Humulus lupulus. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/1892411> 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." .