Rock Garden Plants
Penstemon speciosus Douglas sect. Glabri 
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FamilyPLANTAGINACEAE
Genus speciesPenstemon speciosus Douglas sect. Glabri
BibliographyEdwards‘s Bot. Reg. 15: t. 1270 (1829)
Native Rangew. USA
Primary BiomeTemperate
Habitatgrassland and thickets
Altitude300-3300m
Descriptionleaves thick, rigid, glabrous, oblanceolate to lanceolate-ovate, to 15cm long, stem leaves sessile, inflorescence lax, verticillate, anthers glabrous, flowers 26-38mm long
Size7-65cm
Colorbluish purple
Bloomsummer
Ca
Typeperennial
Cultivationmesic, slightly humous, semi-shady site
alpine house, moist, rich, drained soil, semi-shade
Propagationseed in spring, barely covered, germ. 1-3 months, 13-18°C
division in spring; cuttings in late summer
SynonymsPenstemon deserticola Piper
Penstemon glaber var. speciosus (Douglas) Regel
Penstemon glaber f. speciosus (Douglas) Voss
Penstemon kennedyi A.Nelson
Penstemon pilifer A.Heller
Penstemon rex A.Nelson & J.F.Macbr.
Penstemon speciosus ssp. kennedyi (A.Nelson) D.D.Keck
Penstemon speciosus var. pilifer (A.Heller) Munz & I.M.Johnst.
Penstemon speciosus ssp. typicus D.D.Keck
Territory7 Northern America
     73 Northwestern U.S.A. (IDA Idaho, ORE Oregon, WAS Washington)
     76 Southwestern U.S.A. (CAL California, NEV Nevada, UTA Utah)
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(c) 1990-2025 RNDr. Pavel Slabý