San bernardino beardtongue
The southern Sierra Nevada, California
Open woodland, rocky slopes, from 6,000 to 11,000 feet
Petiolate, obovate to round, unlobed and untoothed, grey-green (glaucous); blades are up to 1.7 inches long
Penstemon caesius is restricted to southern California, in the San Bernardino and San Gabriel Mountains, and the southern Sierra Nevada. Stems and leaves are hairless, and glaucous. Leaves are mostly restricted to the base; they are attached by relatively long stalks, around twice the length as the blade. Stems are reddish.
The inflorescence is an open, branched cluster, with pedicels, calyx and to a lesser extend the outside of the corolla, all covered by glandular hairs. Calyx lobes are slightly spreading. The corolla is up to 0.9 inches long, pink to lavender in color, with five lobes of approximately equal size, not ciliate along the margins. The staminode (infertile stamen) is glabrous, as is the inside of the corolla, apart from a few hairs at the base.