Compositae Working Group (CWG) (2021). Global Compositae Database. Cyanus nigroumbrius (K.Koch) Soják. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1146826 on 2024-05-19
Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Čas. Nár. Mus., Odd. Přír. 140 [Govaerts World Compositae Checklist A-G] [details] LSID urn:lsid:compositae.org:names:277EFFEB-ECF4-40F2-8837-F0C857841E3B [details]