Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"143910 - Erigeron annuus (L.) Pers. ssp. septentrionalis (Fernald & Wiegand) Wagenitz, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-199807. Accessed 17 Apr. 2025.