Compositae Working Group (CWG) (2025). Global Compositae Database. Haplopappus annuus (Rydb.) Cory. Accessed at: https://compositae.org/gcd/aphia.php?p=taxdetails&id=1202180 on 2025-09-13
Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Rhodora 38(455): [Tropicos] [details] LSID urn:lsid:compositae.org:names:805358ED-1E99-4B50-AE17-C0C18B8CD1DF [details] Taxonomy as "Aplopappus" [details]