Within the Penstemon fruticosus article...

P barretiae A. Gray

An ally of P. fruticosus, but quite distinct. It is an erect subshrub 1 to 2 ft high, with glabrous leaves and stems. Leaves on the sterile shoots and at the base of the flowering stems 1{1/4} to 3 in. long and up to 1 in. wide, tapered at the base into an indistinct petiole, entire or faintly toothed, rather thick and distinctly glaucous; leaves at the base of the flowering stems shorter and relatively broader, sessile. Flowers in racemes, or sometimes the peduncles two-flowered. Calyx about {1/4} in. long, the sepals ovate. Corolla lilac-purple, about 1{1/2} in. long. This species was discovered by a Mrs Barret and described in 1886. It has a limited distribution in the Cascade mountains, in Klickitat Co., Washington, north of the Columbia River, and in Mount Hood and Wasco Cos., Oregon, to the south of it. It was in cultivation in Britain as early as 1889 but may not have been in cultivation continuously since then. Plants raised at Kew in the 1930s from seeds received from commercial sources in California and British Columbia were not the true species but forms of P. fruticosus. But J. Elliott had what seems to have been the true species (see Gard. Chron., Vol. 120 (1946), p. 135 and fig. 63).


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