Compositae Working Group (CWG) (2021). Global Compositae Database. Willoughbya heterophylla Small. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1205472 on 2025-01-28
original description(1903). Fl. S.E. U.S. [Small].[details]
Unreviewed
Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Fl. S.E. U.S. 1170. 1903. [Robinson Eupatorieae] Flora of the Southeastern United States [Tropicos] [details] LSID urn:lsid:compositae.org:names:57E1D6B0-E76C-4B83-B898-D31DF22438C6 [details] Taxonomy 22 Jul 1903 [details]