Penstemon speciosus is a species of penstemon known by the common name royal penstemon of western North America.
It is a perennial herb growing erect to a maximum height near NaNcm (-2,147,483,648inches). The leaves are usually lance-shaped and sometimes folded lengthwise, usually less than 15abbr=on1abbr=on long. They are arranged oppositely and often clasp the stem at the bases. The showy inflorescence bears tubular flowers with expanded mouths 26- long. The flowers are light to deep blue, lavender, and purple, and usually have white throats. The white, generally hairless, throat helps to distinguish it from similar species within its range.[1] [2]
Native to the western United States, it is most common east of the crest of the Cascade Range of Washington and Oregon; southern Idaho; mountainous California from the Klamath Ranges along the High Sierra Nevada to the Western Transverse Ranges, San Gabriel and San Bernardino Mountains; and scattered through the mountains of northern Nevada. It is associated with diverse habitats, from sagebrush scrub, plateau and foothill scrub to subalpine mountain forests. It spans a range of elevations but is most common from 3000-.[3] [4]