Within the Penstemon fruticosus article...

var. scouleri (Lindl.) Cronquist

P. scouleri Lindl.
P. menziesii var. scouleri (Lindl.) A. Gr.
P. fruticosus subsp. scouleri (Lindl.) Pennel & Keck

P. fruticosus is mainly represented in cultivation by this variety, which really differs from the typical state of the species only in its relatively narrower leaves, which are 1 to 2 in. long but never more than {1/4} in. wide; they are always finely toothed, except for the smaller basal leaves of the shoot, but the toothing is irregular and not always conspicuous. Bot. Mag., t. 6834.This variety occurs within the area of the typical state of the species, but has a more restricted distribution. It was discovered by Douglas on the Columbia River near the Kettle Falls and introduced by him in 1828. It is hardy in a sunny position in well-drained soil and flowers in May and June. There are white- and pink-flowered forms in cultivation.The plant portrayed in New Flora and Sylva, Vol. 3, fig. 96, as P. lyallii and discussed on p. 265 of that issue, is really a form of P. fruticosus var. scouleri. The true P. lyallii is a much taller plant and scarcely shrubby.


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