Flora of North America species comparison

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Penstemon davidsonii var. davidsonii

Penstemon davidsonii var. praeteritus
Photo is of parent taxon

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

Davidson's late penstemon, timberline beardtongue
Leaf

blades spatulate to orbiculate, margins entire, sometimes serrulate, apex rounded to obtuse.

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

corolla lavender or bluish lavender, violet, or purple, 20–36 mm, moderately white-villous internally abaxially.

corolla bluish lavender to violet, (30–)34–45 mm, sparsely white-lanate internally abaxially.
2n

= 16.

Penstemon davidsonii var. davidsonii

Penstemon davidsonii var. praeteritus
Phenology Flowering May. Flowering May–Jul.
Habitat Rock outcrops, talus slopes. Rock outcrops, talus slopes.
Elevation 900–3700 m. (3000–12100 ft.) 1500–2900 m. (4900–9500 ft.)
Distribution
from FNA
CA; NV; OR; WA; BC
[BONAP county map]
from FNA
NV; OR
[BONAP county map]
Discussion

The ranges of var. davidsonii and var. menziesii overlap throughout much of British Columbia and Washington. Variety davidsonii hybridizes with var. menziesii, and with Penstemon cardwellii, P. fruticosus, P. newberryi, and P. rupicola.

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

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.)
Source FNA vol. 17, p. 87. FNA vol. 17, p. 88.
Parent taxa Plantaginaceae > Penstemon > subg. Dasanthera > sect. Erianthera > Penstemon davidsonii Plantaginaceae > Penstemon > subg. Dasanthera > sect. Erianthera > Penstemon davidsonii
Sibling taxa
P. davidsonii var. menziesii, P. davidsonii var. praeteritus
P. davidsonii var. davidsonii, P. davidsonii var. menziesii
Name authority unknown Cronquist: Leafl. W. Bot. 10: 129. (1964)
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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