This name is a synonym of Solidago puberula subsp. pulverulenta (Nutt.) Semple.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 989A94BA-C70C-4923-9EA3-4E4F1460C8AE) with original publication details: Revis. Gen. Pl. 1 1891.
This name was in version 1 of The Plant List, record gcc-42274, and has not been changed.