Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"22732 - Heliopsis helianthoides (L.) Sweet var. scabra (Dunal) Fernald, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-154721. Accessed 20 Jan. 2025.