Flora of North America species comparison

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Penstemon davidsonii var. davidsonii

Penstemon davidsonii var. menziesii
Photo is of parent taxon

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

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

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

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

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

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

= 16.

= 16.

Penstemon davidsonii var. davidsonii

Penstemon davidsonii var. menziesii
Phenology Flowering May. Flowering Jun–Aug.
Habitat Rock outcrops, talus slopes. Rock outcrops, ledges, talus slopes.
Elevation 900–3700 m. (3000–12100 ft.) 30–2000 m. (100–6600 ft.)
Distribution
from FNA
CA; NV; OR; WA; BC
[BONAP county map]
from FNA
OR; WA; BC
[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.)

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. 87. 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. menziesii, P. davidsonii var. praeteritus
P. davidsonii var. davidsonii, P. davidsonii var. praeteritus
Synonyms P. davidsonii subsp. menziesii, P. menziesii subsp. thompsonii
Name authority unknown (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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