This name is a synonym of Penstemon menziesii subsp. davidsonii (Greene) Piper.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50287560) with original publication details: Mazama 2(2): 99 1901.
⥇ A cross-taxon basionym link was ignored while processing this record,
see Penstemon davidsonii Greene.
This name was in version 1 of The Plant List, record tro-50287560.