Also classified as Oxypolis canbyi (J.M. Coult. & Rose) Fernald.
• Oxypolis canbyi (Canby's cowbane) | USDA PLANTS Database (About This Site)
• Canby's Cowbane | iNaturalist (About This Site)
• Tiedemannia canbyi | Biota of North America Project (BONAP) (About This Site)
• Canby's Cowbane | Maryland Biodiversity Project (About This Site)