Compositae Working Group (CWG) (2021). Global Compositae Database. Heterotheca villosa var. horrida Semple. Accessed at: https://compositae.org/aphia.php?p=taxdetails&id=1247362 on 2025-03-26
Contributed data: Authors Data only shown for fields conflicting with the consensus taxon record (Hook.) Semple [IPNI] (Hook.) Semple [Preliminary Checklist of North American Compositae] (Rydb.) Semple [IPNI] (Rydb.) Semple [Tropicos] [details] Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Heterotheca villosa (Pursh) Shinners var. horrida (Hook.) Semple [Preliminary Checklist of North American Compositae] Heterotheca villosa (Pursh) Shinners var. horrida (Rydb.) Semple [IPNI] Heterotheca villosa var. horrida (Hook.) Semple [IPNI] Heterotheca villosa var. horrida (Rydb.) Semple [Tropicos] [details] LSID urn:lsid:compositae.org:names:7937B0B9-BA3C-4D7C-86AC-C7DD4DFC1D70 [details]