⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Penstemon rattanii in version 1.1 of The Plant List.
This name is a synonym of Penstemon rattanii subsp. kleei .
The record derives from Tropicos which reports it as a synonym (record 29207740
) with original publication details: Syn. Fl. N. Amer. 1(2): 441 441 1886.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:187726-2
.