E-Flora BC: Electronic Atlas of the Flora of British Columbia

Penstemon davidsonii var. menziesii Greene (D.D. Keck) Cronquist
Davidson's penstemon (Menzies' penstemon)
Plantaginaceae (Mare's-tail family)
(Previously in Scrophulariaceae)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #1335)

E-Flora BC Static Map
Distribution of Penstemon davidsonii var. menziesii
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Species Information

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General:
Low-shrubby perennial herb, woody at the base, with or without a taproot; stems much-branched, creeping, forming dense mats; flowering shoots 5-10 cm tall, minutely hairy.
Leaves:
Opposite, evergreen, smooth but sometimes glandular-spotted, primary leaves short-stalked, thick and firm, the blades elliptic to circular, entire or minutely saw-toothed, 0.5-2 cm long, usually blunt-tipped; leaves of the flowering shoots few, unstalked, small, often bract-like, less than 1 cm long.
Flowers:
Inflorescence a compact, few-flowered, terminal raceme, the bracts and stalks somewhat glandular-hairy; corollas purple to blue-lavender, tubular, 2-3.5 cm long, distinctly 2-lipped, smooth on the outside, hairy within on the lower lip near its base and on a pair of hairy ridges; calyces 7-10 mm long, smooth to thinly glandular-hairy, 5-lobed, the lobes lanceolate to narrowly egg-shaped; fertile stamens 4, the anthers densely white-woolly; sterile stamen half as long as the fertile stamens, long yellow-bearded toward the tip.
Fruits:
Capsules, 8-11 mm long; seeds numerous, angled, narrowly winged, about 1.5 mm long.
Notes:
Two sympatric, poorly defined (at least in BC) varieties occur in BC:

1. Leaves entire, tending to be broadest above the middle; infrequent................. var. davidsonii

1. Leaves minutely saw-toothed, tending to be broadest near or below the middle; the common variety.................. var. menziesii (Keck) Cronq.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry rock outcrops, slabs, ledges and talus slopes in the montane to alpine zones; frequent in BC in and west of the Coast-Cascade Mountains to 55degreeN, rare on the Queen Charlotte Islands; S to CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Penstemon davidsonii var. menziesii

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 670 670 670
Slope Gradient (%) 17 17 17
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
147 146 147
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Class
B
Number of field plots
 species was recorded in:
1
Modal BEC Zone Class
PP
All BEC Zones (# of stations/zone) species was recorded in: PP(1)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Penstemon davidsonii subsp. menziesii D.D. Keck
Penstemon menziesii Hook. p.p.

Taxonomic and Nomenclatural Links

Additional Photo Sources

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General References