Compositae Working Group (CWG) (2021). Global Compositae Database. Placus bifrons (L.) M.Gómez. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1123858 on 2024-05-12
original description(1890). Anales Hist. Nat. 19 page(s): 273 [details]
From other sources
Contributed data: Published Data only shown for fields conflicting with the consensus taxon record An. Soc. Hist. Nat. Madrid 19 [IPNI] [details] LSID urn:lsid:compositae.org:names:5422A92A-A6EC-4122-B6E4-34A9FCAAF142 [details] Taxonomy cf. Gray Herb. Card Cat. [details]