Compositae Working Group (CWG) (2024). Global Compositae Database. Vernonia sphaeroidea Nutt.. Accessed at: https://www.compositae.org/gcd/aphia.php?p=taxdetails&id=1118104 on 2025-04-06
Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Transactions of the American Philosophical Society, new series, 7: [Tropicos] [details] LSID urn:lsid:compositae.org:names:E6176653-EACC-4ABC-B0A6-07145F07FEE3 [details] Taxonomy Oct-Dec 1840 [details]