Penstemon glaber |
Penstemon glaber var. glaber |
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sawsepal penstemon, southern smooth beardtongue, western smooth beardtongue |
sawsepal penstemon |
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Stems | ascending, (10–)50–65(–80) cm, glabrous or puberulent to pubescent, not glaucous. |
glabrous. |
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Leaves | basal and cauline, or basal absent or reduced, not leathery, glabrous or puberulent to pubescent, not glaucous; basal and proximal cauline 20–80(–155) × 5–20(–45) mm, blade obovate to oblanceolate or lanceolate, base tapered, margins entire, usually undulate, apex obtuse to acute, sometimes mucronate; cauline (2 or)3–6(–8) pairs, sessile, 27–120(–150) × (6–)22–35(–43) mm, blade lanceolate, base truncate to cordate, apex obtuse to acute. |
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Thyrses | continuous, secund, (3–)6–26(–30) cm, axis glabrous or puberulent, verticillasters (3–)5–12, cymes 2–4-flowered, 2 per node; proximal bracts ovate to lanceolate, 14–100 × 2–36 mm; peduncles and pedicels glabrous or puberulent, peduncles to 71 mm, pedicels 4–14 mm. |
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Flowers | calyx lobes ovate to orbiculate, 2–11 × 1.3–5.5 mm, glabrous or puberulent; corolla blue to violet, with reddish purple nectar guides, ventricose, 24–48 mm, glabrous externally, glabrous internally or sparsely to moderately white-lanate internally abaxially, tube 5–12 mm, throat gradually inflated, slightly constricted at orifice, 8–13(–18) mm diam., rounded abaxially; stamens included or longer pair reaching orifice, pollen sacs divergent, navicular, 1.4–2.5(–2.8) mm, dehiscing incompletely, connective not splitting, sides sparsely to moderately hirsute, hairs white or tan, to 0.5 mm, rarely glabrous, sutures denticulate, teeth to 0.2 mm; staminode (15–)18–22 mm, included or barely exserted, 0.6–1.3 mm diam., tip straight to recurved, rounded to distinctly bifurcate at apex, glabrous or distal 1–2 mm sparsely lanate, hairs pale yellow, to 1.5 mm; style 18–20 mm. |
calyx lobes ovate to orbiculate, 2–4.8 × 1.4–3.8 mm, apex rounded or abruptly short-acuminate; corolla 24–33 mm, glabrous or sparsely to moderately white-lanate internally abaxially; staminode apex rounded. |
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Capsules | 10–17 × 5–8 mm. |
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2n | = 16. |
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Penstemon glaber |
Penstemon glaber var. glaber |
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Phenology | Flowering Jul–Aug(–Sep). | |||||||||
Habitat | Sandy or gravelly shortgrass prairies, pine forests. | |||||||||
Elevation | 1100–2200 m. (3600–7200 ft.) | |||||||||
Distribution |
CO; MT; ND; NE; NM; SD; WY
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MT; ND; NE; SD; WY |
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Discussion | Varieties 3 (3 in the flora). The Penstemon glaber complex has been treated with as many as four species (F. W. Pennell 1920b) or one variable species as treated herein. M. K. W. Latady (1985) found clinal variation in most morphologic characters used to distinguish taxa in the complex and recognized only one species and two varieties: var. glaber (including var. alpinus) in the plains and mountains from southeastern Montana south to central Colorado; and var. brandegeei, in the mountains from central Colorado south to north-central New Mexico. A case for recognizing var. alpinus, as is done here, can be made on morphological, phenological, and ecological grounds. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety glaber occurs from southwestern North Dakota and north-central South Dakota into the Nebraska Panhandle, southeastern Montana, and through most of eastern Wyoming, and it is replaced by var. alpinus and var. brandegeei southward along the Front Range of the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 17, p. 167. | FNA vol. 17, p. 169. | ||||||||
Parent taxa | Plantaginaceae > Penstemon > subg. Penstemon > sect. Glabri | Plantaginaceae > Penstemon > subg. Penstemon > sect. Glabri > Penstemon glaber | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Pursh: Fl. Amer. Sept. 2: 738. (1813) — (as Pentstemon glabra) | unknown | ||||||||
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