Contributed data: Authors Data only shown for fields conflicting with the consensus taxon record (Torr. & A. Gray) C.R. Sweeney & T.R. Fisher [Tropicos] (Torr. & A. Gray) Sweeny & T.R. Fisher [Preliminary Checklist of North American Compositae] [details] Contributed data: Basionym Data only shown for fields conflicting with the consensus taxon record Silphium compositum var. ovatifolium Torr. & A. Gray [Tropicos] [details] Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Silphium compositum Michx. ssp. ovatifolium (Torr. & A. Gray) Sweeny & T.R. Fisher [Preliminary Checklist of North American Compositae] Silphium compositum subsp. ovatifolium (Torr. & A. Gray) C.R. Sweeney & T.R. Fisher [Tropicos] [details] Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Ohio Journal of Science 70: [Tropicos] [details] LSID urn:lsid:compositae.org:names:CA64751A-6474-42D0-B41D-7A511025F9B6 [details]