Compositae Working Group (CWG) (2025). Global Compositae Database. Helianthus rigidus subsp. subrhomboideus (Rydb.) Heiser. Accessed at: https://compositae.org/gcd/aphia.php?p=taxdetails&id=1222112 on 2025-04-25
Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Helianthus rigidus (Cass.) Desf. ssp. subrhomboideus (Rydb.) Heiser [Preliminary Checklist of North American Compositae] [details] Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Mem. Torrey Bot. Club 22, 3 : 136 (1969) [Vascular Plants of Russia] Memoirs of the Torrey Botanical Club 22(3): [Tropicos] [details] LSID urn:lsid:compositae.org:names:B2D50E68-CDEA-4808-93C4-B7BCF1E35C5A [details]