Reference citation: Barbara Charlton. 2017. Papilio cresphontes nectar plant Silphium perfoliatum. iNaturalist.org. Accessed at on 23 Jan 2021.
Source citation: 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.
Reference citation: Robertson, C. 1929. Flowers and insects: lists of visitors to four hundred and fifty-three flowers. Carlinville, IL, USA, C. Robertson.
Source citation: Sarah E Miller. 6/25/2015. Species associations manually extracted from Robertson, C. 1929. Flowers and insects: lists of visitors to four hundred and fifty-three flowers. Carlinville, IL, USA, C. Robertson.
