Penstemon rupicola

Penstemon rupicola is a species of penstemon known by the common names cliff beardtongue or rock penstemon.[1] It is native to the west coast of the United States from Washington to the Klamath Mountains of far northern California, where it grows in rocky mountainous habitat. It is a clumpy, mat-forming subshrub growing no more than 14 centimeters high. The thick, waxy, oppositely arranged leaves are round or oval and up to 2 centimeters long. The showy wide-mouthed tubular flowers emerging from the mat may be nearly 4 centimeters in length and are shades of light purple to bright pink.

Penstemon rupicola
Penstemon rupicola in Mount Rainier National Park
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Plantaginaceae
Genus: Penstemon
Species:
P. rupicola
Binomial name
Penstemon rupicola
(Piper) T.J.Howell

Penstemon rupicola is included in Penstemon subgenus Dasanthera, along with P. barrettiae, P. cardwellii, P. davidsonii, P. ellipticus, P. fruticosus, P. lyallii, P. montanus, and P. newberryi.[2]

It has gained the Royal Horticultural Society's Award of Garden Merit. [1]

References
  1. "Penstemon rupicola". www.rhs.org. Royal Horticultural Society. Retrieved 24 January 2021.
  2. "Penstemon - Dasanthera Group". North American Rock Garden Society. Retrieved June 21, 2014.


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