This name is a synonym of Pseudolysimachion rotundum subsp. subintegrum (Nakai) D.Y. Hong.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29205837) with original publication details: Bot. Mag. (Tokyo) 25(289): 62 1911.
This name was in version 1 of The Plant List, record tro-29205837.