This name is a synonym of Lactuca tatarica (L.) C.A.Mey..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 158EBD45-CBFA-40B2-AD80-F6F509A3B735) with original publication details: Fl. Am. Sept. ii. 502. 502 .
This name was in version 1 of The Plant List, record gcc-141249.