The record derives from TICA
(data supplied on )
which reports it as a synonym (record
5116EF69-5706-4C58-B441-2DF53579C3FE) with original publication details: "J. Bigelow, Fl. Boston., ed. 2. 1824" 290 1824.
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 Sonchus spinulosus in version 1 of The Plant List.