Flora of North America species comparison

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Penstemon davidsonii var. praeteritus

Penstemon subg. Dasanthera
Photo is of parent taxon

Davidson's late penstemon, timberline beardtongue
Leaf

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

Flowers

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

Penstemon davidsonii var. praeteritus

Penstemon subg. Dasanthera
Phenology Flowering May–Jul.
Habitat Rock outcrops, talus slopes.
Elevation 1500–2900 m. (4900–9500 ft.)
Distribution
from FNA
NV; OR
[BONAP county map]
w North America
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.)

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. 88. FNA vol. 17, p. 85.
Parent taxa Plantaginaceae > Penstemon > subg. Dasanthera > sect. Erianthera > Penstemon davidsonii Plantaginaceae > Penstemon
Sibling taxa
P. davidsonii var. davidsonii, P. davidsonii var. menziesii
Subordinate taxa
Synonyms Dasanthera
Name authority Cronquist: Leafl. W. Bot. 10: 129. (1964) (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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