Compositae Working Group (CWG) (2021). Global Compositae Database. Carduus undulatus var. canescens (Nutt.) Porter. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1231342 on 2024-05-17
Contributed data: Authors Data only shown for fields conflicting with the consensus taxon record Porter [Govaerts World Compositae Checklist A-G] [details] Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Carduus undulatus Nutt. var. canescens (Nutt.) Porter [Preliminary Checklist of North American Compositae] Carduus undulatus var. canescens Porter [Govaerts World Compositae Checklist A-G] [details] LSID urn:lsid:compositae.org:names:626FCD76-0908-4B7D-A470-7693D6F2EB84 [details]