The record derives from TICA
(data supplied on )
which reports it as a synonym (record
9FCA0205-534D-4DCA-A42B-55BA5764D53D) with original publication details: "G.S. Karelin, I.P. Kirilov in Bull. Soc. Imp. Naturalistes Moscou 15. 1842" 399 1842.
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 rigida in version 1 of The Plant List.