Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"73065 - Helianthus nuttallii Torr. & A. Gray ssp. canadensis Long, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-115. Accessed 19 Jan. 2025.