The record derives from TICA
(data supplied on )
which reports it as a synonym (record
D2309F70-638C-48C6-9E48-1091D811EAB1) with original publication details: E.B. Babcock in Univ. Calif. Publ. Bot. 19. 1941 403 1941.
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Crepis setosa in version 1 of The Plant List.