Compositae Working Group (CWG) (2021). Global Compositae Database. Haplopappus validus (Rydb.) Cory. Accessed at: https://compositae.org/aphia.php?p=taxdetails&id=1181347 on 2024-05-18
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:DFA43DDD-F9FD-4118-B2E4-5493AB55242A [details] Taxonomy as "Aplopappus" [details]