Penstemon thompsoniae

(A. Gray) Rydberg

Bull. Torrey Bot. Club 36: 690. 1909.

Common names: Thompson’s beardtongue
Endemic
Basionym: Penstemon pumilus var. thompsoniae A. Gray in A. Gray et al. Syn. Fl. N. Amer. 2(1): 269. 1878
Synonyms: P. thompsoniae var. desperatus Neese P. thompsoniae subsp. jaegeri D. D. Keck
Treatment appears in FNA Volume 17. Treatment on page 107. Mentioned on page 99, 108.

Stems prostrate or ascending, 4–15 (–25) cm, retrorsely hairy, hairs appressed, white, scalelike. Leaves not leathery, densely retrorsely hairy, hairs appressed, white, scalelike; cauline 1–5 pairs, petiolate, 6–25 (–33) × 2–6.5 mm, blade obovate to spatulate, base tapered, apex mucronate, sometimes rounded or obtuse. Thyrses continuous, secund, (1–) 2–12 cm, axis retrorsely hairy, hairs appressed, white, scalelike, sometimes also glandular-pubescent distally, verticillasters (1–) 3–12, cymes 1–3 (–5) -flowered, 1 per node; proximal bracts spatulate to oblanceolate, 5–19 × 1.5–4 mm; peduncles and pedicels spreading to ascending, retrorsely hairy, hairs pointed, and, sometimes, sparsely glandular-pubescent. Flowers: calyx lobes lanceolate, 4–6 × 1–1.7 mm, herbaceous or narrowly scarious-margined, sparsely glandular-pubescent and retrorsely hairy, hairs appressed, white, scalelike; corolla blue to violet or purple, lined internally abaxially with reddish violet nectar guides, ampliate, 10–18 mm, yellow-lanate internally abaxially, tube 6–7 mm, throat gradually inflated, 4.5–6 mm diam., 2-ridged abaxially; stamens reaching orifice or longer pair exserted, filaments glabrous, pollen-sacs divergent, navicular, 0.8–1.2 (–1.4) mm, sutures papillate; staminode 8–9 mm, exserted, flattened distally, 0.2–0.3 mm diam., tip recurved, distal 6–8 mm pubescent, hairs yellow or orange, to 0.8 mm; style 10–13 mm. Capsules 3.5–5.5 × 3–4 mm.


Phenology: Flowering May–Aug.
Habitat: Sandy to gravelly soils, sagebrush shrublands, pine-juniper woodlands, pine forests.
Elevation: 1500–3400 m.

Distribution

Ariz., Calif., Nev., Utah.

Discussion

D. D. Keck (1937) recognized two subspecies in his treatment of Penstemon thompsoniae: subsp. jaegeri, restricted to mountains of Clark County, Nevada, which he distinguished by its few, remote stems and open inflorescences, and subsp. thompsoniae in Arizona, Nevada, and Utah, which he distinguished by its tufted stems and compact inflorescences. A morphologic continuum exists between the two subspecies.

Neese described var. desperatus from Beaver and Iron counties, Utah, and eastern Nevada, distinguishing it from var. thompsoniae by its longer stems and inflorescences, and smaller leaves. She later concluded that geographic variation in Penstemon thompsoniae was not sufficiently geographically correlated to recognize infraspecific taxa (E. C. Neese 1993).

Selected References

None.

Lower Taxa

None.

"/4+timescorollathroat" is not declared as a valid unit of measurement for this property.

... more about "Penstemon thompsoniae"
obtuse +, rounded +  and mucronate +
Craig C. Freeman +
(A. Gray) Rydberg +
alternate +, opposite +, whorled +, helical +  and subopposite +
tapered +
Penstemon pumilus var. thompsoniae +
obovate;spatulate +
not +  and leathery +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
scarious-margined +
hairy +  and glandular-pubescent +
short-tubular +  and short-campanulate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
Thompson’s beardtongue +
blue +  and violet or purple +
yellow-lanate +
salverform +  and tubular-funnelform +
ampliate +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1-3(-5)-flowered +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
scale-like +  and not needlelike +
Ariz. +, Calif. +, Nev. +  and Utah. +
drupe-like +
1500–3400 m. +
curved +  and straight +
1 +  and 4 +
Sandy to gravelly soils, sagebrush shrublands, pine-juniper woodlands, pine forests. +
orange +, yellow +  and white +
glandular-pubescent +
scale-like +  and pointed +
0 cm0 mm <br />0 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
cauline +, proximal +  and basal +
not leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
erose +  and entire +
glabrate +, hairy +  and glandular-pubescent +
toothed +  and entire +
herbaceous +  and scarious +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
spreading +  and ascending +
spreading;ascending +
5 +  and 4 +
Flowering May–Aug. +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
navicular-sigmoid +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
spatulate +  and oblanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Bull. Torrey Bot. Club +
minute +
dark-brown +  and black +
angled +  and rounded +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (?) +  and 0.9 cm9 mm <br />0.009 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;prostrate +
4 cm40 mm <br />0.04 m <br /> (15 cm150 mm <br />0.15 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
papillate +
denticulate +
P. thompsoniae var. desperatus +  and P. thompsoniae subsp. jaegeri +
Penstemon thompsoniae +
Penstemon sect. Caespitosi +
species +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-ridged +  and inflated +
not constricted +
secund +  and continuous +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
cylindric +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
straight +
gibbous +  and not spurred +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
subshrub +  and cespitose +