Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"98060 - Helianthemum nummularium (Cav.) Losa & Rivas Goday ssp. obscurum Holub, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-154540. Accessed 17 Mar. 2025.