Penstemon laevis

Pennell

Contr. U.S. Natl. Herb. 20: 347. 1920.

Common names: Southwestern beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 170. Mentioned on page 148, 157.

Stems ascending to erect, 28–90 cm, glabrous, ± glaucous. Leaves basal and cauline, ± leathery, glabrous, ± glaucous; basal and proximal cauline 35–120 (–150) × 8–30 mm, blade obovate to oblanceolate or elliptic, base tapered, margins entire, sometimes undulate, apex obtuse; cauline 3–6 pairs, sessile or proximals sometimes short to long-petiolate, (20–) 30–120 × 6–20 (–29) mm, blade oblanceolate to lanceolate or elliptic, base truncate to clasping, sometimes tapered, margins sometimes undulate, apex obtuse to acute. Thyrses continuous, secund, 8–48 cm, axis glabrous; verticillasters 5–8 (–17), cymes 1–4-flowered, 2 per node; proximal bracts lanceolate, 10–65 × 2–15 mm; peduncles and pedicels glabrous. Flowers: calyx lobes ovate to lanceolate, (4–) 4.5–9 (–10) × 2.1–3.4 (–3.8) mm, glabrous; corolla blue to bluish violet, with reddish violet nectar guides, ventricose, (20–) 25–32 mm, glabrous externally, glabrous internally, tube 7–11 mm, throat abruptly inflated, slightly constricted at orifice, 8–12 mm diam., 2-ridged abaxially; stamens: longer pair reaching orifice or exserted, pollen-sacs divergent, sigmoid, 2–2.5 mm, dehiscing incompletely, proximal 1/4 indehiscent, connective not splitting, sides glabrous, sutures denticulate, teeth to 0.1 mm; staminode 16–19 mm, included or reaching orifice, 0.6–0.9 mm diam., tip straight to recurved, distal 5–7 mm ± pilose, hairs yellow, to 1 mm; style (17–) 19–23 mm. Capsules 8–10 × 5–6 mm.


Phenology: Flowering May–Jun.
Habitat: Sandy soils, sagebrush, juniper, oak-juniper, and pine-juniper communities.
Elevation: 1100–2000 m.

Discussion

Penstemon laevis is known from Coconino and Mohave counties, Arizona, and Garfield, Kane, and Washington counties, Utah. Penstemon ×jonesii Pennell, a putative hybrid between P. eatonii and P. laevis, is known from Kane and Washington counties, Utah (E. C. Neese and N. D. Atwood 2003).

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon laevis"
obtuse +  and acute +
Craig C. Freeman +
Pennell +
alternate +, opposite +, whorled +, helical +  and subopposite +
truncate;clasping +
tapered;tapered +
Penstemon +
oblanceolate;lanceolate or elliptic +
not +  and leathery +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
ovate;lanceolate +
2.1mm;3.4mm +
short-tubular +  and short-campanulate +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Southwestern beardtongue +
not personate +, weakly bilabiate +  and strongly bilabiate +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
blue +  and bluish violet +
ventricose +
ventricose-ampliate +
2.5 cm25 mm <br />0.025 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
1-4-flowered +
scale-like +  and not needlelike +
Ariz. +  and Utah. +
drupe-like +
1100–2000 m. +
curved +  and straight +
1 +  and 4 +
Sandy soils, sagebrush, juniper, oak-juniper, and pine-juniper communities. +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
basal +  and cauline +
glaucous +  and glabrous +
leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
glutinous +
puberulent +, glandular-pubescent +  and glabrous +
undulate +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
spreading +, erect +  and ascending +
spreading;erect;ascending +
5 +  and 4 +
Flowering May–Jun. +
indehiscent +  and dehiscing +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
long-petiolate +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
1 cm10 mm <br />0.01 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Contr. U.S. Natl. Herb. +
minute +
tan +  and brown or dark-brown +
angled +  and angled-elongate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
papillate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
reaching orifice +  and included +
1.6 cm16 mm <br />0.016 m <br /> (?) +  and 1.9 cm19 mm <br />0.019 m <br /> (?) +
short-petiolate +  and petiolate +
glutinous +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
cauline +, proximal +  and basal +
glaucous +  and glabrous +
reduced +
28 cm280 mm <br />0.28 m <br /> (90 cm900 mm <br />0.9 m <br />) +
not +  and leathery +
1.7 cm17 mm <br />0.017 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
1.9 cm19 mm <br />0.019 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
papillate +
denticulate +
Penstemon subg. Habroanthus +
Penstemon laevis +
Penstemon sect. Glabri +
species +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
2-ridged +  and inflated +
constricted +
secund +  and continuous +
cylindric +
8 cm80 mm <br />0.08 m <br /> (48 cm480 mm <br />0.48 m <br />) +
straight +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
smooth +  and papillate +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
gibbous +  and not spurred +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
petiolate +  and sessile +
cauline +  and proximal +