As classified in WFO snapshot
December 2023
latest classification for this taxon
species
Penstemon caesius
This species name was first published in Proc. Amer. Acad. Arts 19: 92 (1883)
At the time of this classification snapshot, this species name was accepted by WFO (placed as the accepted name of a taxon). Its description and other taxonomic data can be found on World Flora Online, id: wfo-0001136973.