This name is a synonym of Populus fremontii S.Watson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50295592) with original publication details: Revis. Gen. Pl. 2: 643 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:208268-2.
This name was in version 1 of The Plant List, record tro-50295592.