This name is a synonym of Penstemon attenuatus var. pseudoprocerus .
The record derives from Tropicos
(data supplied on )
which reports it as a synonym (record 29204280
) with original publication details: Mem. New York Bot. Gard. 1: 346–347 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:187699-2
.
This name was in version 1 of The Plant List, record tro-29204280.