This name is unresolved, but some data suggest that it is synonymous with Tetranema roseum .
The record derives from WCSP (in review) (data supplied on ) which does not establish this name either as an accepted name or as a synonym with original publication details: Prodr. 10: 331 1846.
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This name record (from WCSP (in review)) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Penstemon mexicanus in version 1 of The Plant List.