This name is a synonym of Hymenoclea sandersonii (S.L.Welsh) N.H.Holmgren.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 93A02ADA-B240-4100-BB10-7B243B1662B1) with original publication details: 396 1993.
This name was in version 1 of The Plant List, record gcc-86543, and has not been changed.