Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"18953 - Sonchus arvensis L. var. glabrescens Günther, Grabowski & Wimmer, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-168949. Accessed 03 Feb. 2025.