Penstemon Species, Alpine Sawsepal Penstemon, Beard Tongue, Blue Penstemon, Pride of the Mountain (Penstemon glaber var. alpinus)
Penstemon glaber var. alpinus
Jardin alpin du Lautaret. Photo courtesy of Karl Gercens. Copyright Karl Gercens. Conservatory Horticulturist at Longwood Gardens. http://www.karlgercens.com
