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Abstract
Penstemon series Speciosi consists of six geographically replacing species centered around (although not common within) the Great Basin. Descriptions, specimen-citations, maps and a key document the taxonomy involved and may be used to distinguish the species. Of the six species, only Penstemon speciosus is highly variable, it consisting of a polymorphic assemblage of races. Character-combinations in this species are mapped and discussed. No new taxa, nor changes in rank are proposed. KEY TO SPECIES WITHIN SERIES SPECIOSI A. Leaves broad, 2-4 cm wide; anther sacs pubescent, 3-4 mm long across the connective (from tip to tip) ; stems glabrous; plants robust, 2-5 dm high; staminode bearded; corolla eglandular; Blue Mountains of Wallowa County, Oregon, and adjacent southern Washington. ........ -........-. 1. P. pennellianus AA. Leaves narrow, 0.5-2.0 mm wide. B. Anther sacs glabrous; Pacific Coast States and Great Basin, south and west of the Snake River. C. Anther sacs 4-6 mm long across the connective (from tip to tip); seeds 2.5-3.5 mm long; west of 1140 longitude (approx. the Utah-Nevada border) . ......... 2. P. speciosus CC. Anther sacs 3-4 mm long across the connective; seeds 2.03.0 mm long; east of 1140 longitude. D. Stems and leaves glabrous; plants robust, 4-7 dm high; staminode bearded; corolla eglandular; seeds 2.0-2.5 mm long; southern Utah, in Garfield, Kane, and Washington counties 3. P. laevis DD. Stems and leaves pubescent; plants compact, 1-2 dm high; staminode glabrous; corolla eglandular; seeds 2.23.0 mm long; central Utah, in Sevier County.- -.-.-.--.-.-......------.-....-.-.----.- 4. P. wardii BB. Anther sac pubescent; Idaho, Montana and Wyoming, north and east of the Snake River. E. Stems and basal leaves pubescent; staminode glabrous; sepals long-caudate; Lemhi County, Idaho, and adjacent Ravalli and Beaverhead counties, Montana......... . 5. P . lem hiensis EE. Stems and leaves glabrous; staminode bearded; sepals mucronate; Yellowstone National Park, west to southcentral Idaho, wholly southeast of the range of P. lemhiensis 6. P. cyaneus 1. Penstemon pennellianus Keck (Fig. 1). Penstemon pennellianus Keck, in Amer. Midl. Nat. 23: 614-615. 1940. Type: Sprague [& Gilkey s.n.] (Dudley Herb. No. 239436; photo, PH!) from Joseph Creek Canyon below Flora and 40 mi. n. of Enterprise, Oregon,
Published Version
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