. . . . . . . . . "Penstemon digitalis" . . "Penstemon digitalis" . . "Jeff Skrentny. 2014. Penstemon digitalis nectar plant Penstemon digitalis. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/4724575> 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." .