Flora of North America species comparison

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Penstemon davidsonii var. praeteritus

Penstemon davidsonii var. menziesii
Photo is of parent taxon

Davidson's late penstemon, timberline beardtongue
Photo is of parent taxon

Davidson's beardtongue, Davidson's penstemon, Menzies' penstemon
Leaf

blades elliptic to ovate, sometimes spatulate, margins entire, apex obtuse to acute.

blades spatulate to elliptic, margins ± serrulate, apex rounded to obtuse or acute.
Flowers

corolla bluish lavender to violet, (30–)34–45 mm, sparsely white-lanate internally abaxially.

corolla violet, 20–35 mm, moderately white-villous internally abaxially.
2n

= 16.

Penstemon davidsonii var. praeteritus

Penstemon davidsonii var. menziesii
Phenology Flowering May–Jul. Flowering Jun–Aug.
Habitat Rock outcrops, talus slopes. Rock outcrops, ledges, talus slopes.
Elevation 1500–2900 m. (4900–9500 ft.) 30–2000 m. (100–6600 ft.)
Distribution
from FNA
NV; OR
[BONAP county map]
from FNA
OR; WA; BC
[BONAP county map]
Discussion

Populations of var. praeteritus occur on isolated, relatively dry peaks in the Great Basin. It is known from the Jackson Mountains and Pine Forest and Santa Rosa ranges in Humboldt County, Nevada, and the Pueblo Mountains and Steens Mountain in Harney County, Oregon, and is disjunct to the west from the nearest populations of var. davidsonii by approximately 120 km.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

The ranges of var. davidsonii and var. menziesii overlap throughout much of British Columbia and Washington.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 88. FNA vol. 17, p. 87.
Parent taxa Plantaginaceae > Penstemon > subg. Dasanthera > sect. Erianthera > Penstemon davidsonii Plantaginaceae > Penstemon > subg. Dasanthera > sect. Erianthera > Penstemon davidsonii
Sibling taxa
P. davidsonii var. davidsonii, P. davidsonii var. menziesii
P. davidsonii var. davidsonii, P. davidsonii var. praeteritus
Synonyms P. davidsonii subsp. menziesii, P. menziesii subsp. thompsonii
Name authority Cronquist: Leafl. W. Bot. 10: 129. (1964) (D. D. Keck) Cronquist: in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 4: 379. (1959)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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