This name is a synonym of Populus deltoides var. mesetae (Eckenw.) Cronquist.
The record derives from Tropicos which reports it as a synonym (record 50295598) with original publication details: Phytologia 42(3): 220 220 1979.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:208290-2.