Penstemon speciosus
Introduction '''''Penstemon speciosus''''' is a species of penstemon known by the common name '''royal penstemon''' of western North America.
Distribution 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 .
Description It is a perennial herb growing erect to a maximum height near . The leaves are usually lance-shaped and sometimes folded lengthwise, usually less than  long. They are arranged oppositely and often clasp the stem at the bases. The showy inflorescence bears tubular flowers with expanded mouths  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.
References
External links ** CalPhotos gallery