Flora of North America species comparison

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Penstemon davidsonii var. davidsonii

Penstemon subg. Dasanthera
Photo is of parent taxon

Davidson's beardtongue, Davidson's penstemon
Leaf

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

Flowers

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

pollen sacs usually explanate, dehiscing completely, connective splitting, sides usually densely lanate, (subexplanate, sides glabrous in P. personatus), sutures smooth;

staminode included, length usually 1/3–3/4 times corolla throat.
Seeds

angled, wings absent or narrow.
2n

= 16.

Penstemon davidsonii var. davidsonii

Penstemon subg. Dasanthera
Phenology Flowering May.
Habitat Rock outcrops, talus slopes.
Elevation 900–3700 m. (3000–12100 ft.)
Distribution
from FNA
CA; NV; OR; WA; BC
[BONAP county map]
w North America
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.)

Species 10 (10 in the flora).

Subgenus Dasanthera appears to be the basal lineage in the clade corresponding to Penstemon (A. D. Wolfe et al. 2006). As circumscribed here, subg. Dasanthera comprises a single section, sect. Erianthera. Morphologic and molecular data indicate that the persistent-leaved lineage of the Sierra-Cascade is derived from the mostly deciduous-leaved lineage of the Rocky Mountains (A. D. Every 1977; S. L. Datwyler and Wolfe 2004).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 87. FNA vol. 17, p. 85.
Parent taxa Plantaginaceae > Penstemon > subg. Dasanthera > sect. Erianthera > Penstemon davidsonii Plantaginaceae > Penstemon
Sibling taxa
P. davidsonii var. menziesii, P. davidsonii var. praeteritus
Subordinate taxa
Synonyms Dasanthera
Name authority unknown (Rafinesque) Pennell: Contr. U.S. Natl. Herb. 20: 327. (1920)
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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