Siskiyou Penstemon, Tongue-leaved Penstemon: Penstemon anguineus (Synonyms: Penstemon anguineus var. rattanii, Penstemon rattanii var. minor) -
Sulfur Penstemon, Taper-leaved Penstemon: Penstemon attenuatus var. attenuatus (Synonym: Penstemon attenuatus ssp. attenuatus) -
Azure Penstemon: Penstemon azureus var. azureus (Synonym: Penstemon azureus var. azureus) -
Cardwell's Penstemon, Cardwell's Beardtongue: Penstemon cardwellii -
Ash Penstemon, Small-flowered Penstemon: Penstemon cinicola -
Yellow Penstemon, Lesser Yellow Beardtongue: Penstemon confertus -
Davidson's Penstemon, Davidson's Beardtongue: Penstemon davidsonii var. davidsonii (Synonyms: Penstemon menziesii ssp. davidsonii, Penstemon menziesii ssp. thompsonii) -
Menzies' Beardtongue, Menzies' Penstemon: Penstemon davidsonii var. menziesii (Synonym: Penstemon davidsonii var. menziesii) -
Hotrock Beardtongue, Hot-rock Penstemon, Scabland Penstemon: Penstemon deustus var. deustus (Synonym: Penstemon deustus ssp. deustus) -
Hot-rock Penstemon, Lanceleaf Hotrock Beardtongue, Lanceleaf Hotrock Penstemon, Scorched Penstemon: Penstemon deustus var. pedicellatus (Synonyms: Penstemon deustus ssp. heterander, Penstemon deustus var. heterander) -
Hot-rock Penstemon, Ovate-leaved Hotrock Beardtongue, Scorched Penstemon: Penstemon deustus var. suffrutescens -
Glaucous Beardtongue, Glaucous Penstemon: Penstemon euglaucus -
Shrubby Penstemon, Bush Penstemon: Penstemon fruticosus var. fruticosus (Synonym: Penstemon fruticosus ssp. fruticosus) -
Bush Penstemon, Shrubby Penstemon: Penstemon fruticosus var. scouleri (Synonyms: Penstemon fruticosus ssp. scouleri, Penstemon scouleri) -
Sawleaf Bush Penstemon, Shrubby Penstemon: Penstemon fruticosus var. serratus (Synonym: Penstemon fruticosus ssp. serratus)
Gairdner's Beardtongue, Gairdner's Penstemon: Penstemon gairdneri var. gairdneri -
Stickystem Penstemon, Sticky-stem Penstemon: Penstemon glandulosus var. chelanensis (Synonyms: Penstemon glandulosus ssp. chelanensis) -
Stickystem Penstemon, Sticky-stem Penstemon: Penstemon glandulosus var. glandulosus (Synonyms: Penstemon glandulosus ssp. glandulosus) -
Slender Penstemon: Penstemon gracilentus -
Low Penstemon, Lowly Penstemon, Low Beardtongue: Penstemon humilus var. humilus (Synonyms: Penstemon cinereus, Penstemon cinereus ssp. cinereus, Penstemon cinereus ssp. foliatus, Penstemon humilis ssp. humilis) -
Cheerful Penstemon, Gay Penstemon: Penstemon laetus var. sagittatus (Synonym: Penstemon laetus var. sagittatus) -
Berry's Penstemon, Mountain Pride: Penstemon newberryi var. berryi (Penstemon newberryi ssp. berryi) -
Broad-leaved Penstemon, Egg-leaf Beardtongue: Penstemon ovatus -
Small Azure Penstemon: Penstemon parvulus (Synonym: Penstemon azureus var. parvulus) -
Peck's Penstemon: Penstemon peckii -
Short-flowered Pincushion Beardtongue, Small-leaved Penstemon, Tiny-bloom Penstemon, Pincushion Beardtongue, Tolmie's Beardtongue: Penstemon procerus var. brachyanthus (Synonyms: Penstemon brachyanthus, Penstemon procerus ssp. brachyanthus, Penstmon tolmiei ssp. brachyanthus) -
Littleflower Penstemon, Pincushion Beardtongue, Small-flowered Penstemon: Penstemon procerus var. procerus -
Small-flowered Penstemon, Small-leaved Penstemon, Tiny-bloom Penstemon, Tolmie's Penstemon: Penstemon procerus var. tolmiei -
Rattan's Penstemon: Penstemon rattanii var. rattanii (Synonym: Penstemon rattanii var. rattanii) -
Curved-cutleaf Beardtongue, Cutleaf Beardtongue, Richardson's Penstemon: Penstemon richardsonii var. curtiflorus -
Cutleaf Beardtongue, Richardson's Penstemon: Penstemon richardsonii var. richardsonii -
Roezl's Penstemon, Roezli's Penstemon: Penstemon roezlii (Synonyms: Penstemon laetus ssp. roezlii, Penstermon laetus var. roezlii) -
Cliff Beardtongue, Cliff Penstemon, Rock Penstemon: Penstemon rupicola (Synonym: Penstemon newberryi var. rupicola) -
Herbaceous Penstemon, Rydberg's Penstemon: Penstemon rydbergii var. oreocharis (Synonym: Penstemon oreocharis) -
Rydberg's Penstemon: Penstemon rydbergii var. rydbergii (Synonym: Penstemon rydbergii var. varians) -
Cascade Penstemon, Cascade Beardtongue, Coast Penstemon, Serrulate Penstemon: Penstemon serrulatus -
Royal Penstemon, Royal Beardtongue, Showy Penstemon: Penstemon speciosus (Synonym: Penstemon speciosus ssp. kennedyi) -
Fine-toothed Beardtongue, Fine-toothed Penstemon, Subserrate Penstemon: Penstemon subserratus -
Washington Beardtongue, Washington Penstemon: Penstemon washingtonensis -