This name is a synonym of Pseudolysimachion linariifolium subsp. dilatatum (Nakai & Kitag.) D.Y. Hong.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29207827) with original publication details: Fl. Reipubl. Popularis Sin. 67(2): 265, 402, pl. 72 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:891554-1.
This name was in version 1 of The Plant List, record tro-29207827, and has not been changed.