Penstemon nanus

D. D. Keck

Amer. Midl. Naturalist 23: 607. 1940.

Common names: Low beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 141. Mentioned on page 126.

Stems ascending, 2–10 (–14) cm, densely retrorsely hairy. Leaves basal and cauline, not leathery, densely retrorsely hairy; basal and proximal cauline petiolate, 12–35 (–50) × 3–10 mm, blade ovate to lanceolate, base tapered, margins entire, rarely obscurely dentate, apex obtuse to acute; cauline 1–3 pairs, sessile, 13–34 × 2–6 mm, blade oblanceolate to lanceolate or linear, base tapered to slightly clasping, margins entire, apex obtuse to acute. Thyrses continuous, cylindric, axis glandular-pubescent, 2–3 (–8) cm, verticillasters 1–5 (or 6), cymes 2–4-flowered, 2 per node; proximal bracts lanceolate, 11–20 × 2–6 mm; peduncles and pedicels glandular-pubescent. Flowers: calyx lobes ovate to lanceolate, 4–6 × 1.8–2.2 mm, glandular-pubescent; corolla violet to blue or purple, with reddish violet nectar guides, tubular-funnelform, 12–16 mm, sparsely yellow-lanate internally abaxially, tube 5–6 mm, throat gradually inflated, not constricted at orifice, 4–7 mm diam., rounded abaxially; stamens included, pollen-sacs parallel, navicular, 1.7–2 mm, dehiscing completely, sutures papillate; staminode 8–9 mm, included or reaching orifice, 0.8–0.9 mm diam., tip straight, distal 5–6 mm moderately to densely pubescent, hairs orange, to 0.8 mm; style 9–11 mm. Capsules 4–7 × 3–4.5 mm.


Phenology: Flowering May–Jun.
Habitat: Pinyon-juniper woodlands, desert shrublands.
Elevation: 1700–2300 m.

Discussion

Penstemon nanus is known from the ranges and dry valleys of western Beaver and Millard counties. Populations are concentrated in and near the Burbank Hills, Confusion Range, Halfway Hills, Mountain Home Range, and Tunnel Spring and Wah Wah mountains. The parallel pollen sacs and glandular-pubescent thyrse axes of P. nanus distinguish it from P. dolius.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon nanus"
obtuse +  and acute +
Craig C. Freeman +
D. D. Keck +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
glandular-pubescent +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
alternate +, opposite +, whorled +, helical +  and subopposite +
tapered;tapered +
Penstemon +
oblanceolate;lanceolate or linear +
not +  and leathery +
glandular-pubescent +
ovate;lanceolate +
1.8mm;2.2mm +
short-tubular +  and short-campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
glandular-pubescent +  and glabrous +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Low beardtongue +
not personate +, rarely nearly radially symmetric +  and weakly strongly bilabiate +
violet +  and blue or purple +
yellow-lanate +
tubular-funnelform +
ampliate +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
2-4-flowered +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
scale-like +  and not needlelike +
drupe-like +
1700–2300 m. +
curved +  and straight +
1 +  and 4 +
Pinyon-juniper woodlands, desert shrublands. +
0 cm0 mm <br />0 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
membranous +
terminal +  and axillary +
short-petiolate +, sessile +  and petiolate +
whorled +  and opposite +
persistent +  and deciduous +
basal +  and cauline +
not leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
entire +  and dentate +
glabrous +, puberulent +, hairy +, scabrous +, glandular-villous +  and glandular-pubescent +
toothed +  and entire +
scarious +  and herbaceous +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
ascending +  and erect +
glandular-pubescent +
ascending;erect +
glandular-pubescent +
5 +  and 4 +
Flowering May–Jun. +
navicular-sigmoid +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1/5 +  and 1/2 +
1.1 cm11 mm <br />0.011 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Amer. Midl. Naturalist +
minute +
black +, dark-brown +  and brown +
angled +  and reniform or slightly rounded +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
reaching orifice +  and included +
0.8 cm8 mm <br />0.008 m <br /> (?) +  and 0.9 cm9 mm <br />0.009 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
10 cm100 mm <br />0.1 m <br /> (14 cm140 mm <br />0.14 m <br />) +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
glandular-pubescent +  and glabrous +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
papillate +
denticulate +
Penstemon sect. Albidi +
Penstemon nanus +
Penstemon sect. Cristati +
species +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
rounded +  and inflated +
not constricted +
cylindric +
straight +
gibbous +  and not spurred +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cauline +  and proximal +
acaulescent +  and caulescent +