This name is a synonym of Cryptantha ambigua (A.Gray) Greene.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name with original publication details: U.S. Expl. Exped., Bot. 2: 416 1857.
This name was in version 1 of The Plant List, record kew-2797848.