Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"139561 - Symphyotrichum lanceolatum (Willd.) G. L. Nesom ssp. hesperium (A. Gray) G. L. Nesom, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-160527. Accessed 17 Apr. 2025.