Penstemon laxus

A. Nelson

Bot. Gaz. 54: 147. 1912.

Common names: Lax beardtongue
Endemic
Synonyms: Penstemon watsonii subsp. laxus (A. Nelson) D. D. Keck
Treatment appears in FNA Volume 17. Treatment on page 211. Mentioned on page 187, 219, 227.

Herbs. Stems ascending to erect, 30–70 cm, ± retrorsely hairy, not glaucous. Leaves essentially cauline, basal leaves absent or poorly developed, not leathery, glabrous, sometimes ± puberulent; cauline 4–8 (–10) pairs, sessile, 30–90 × 4–17 mm, blade lanceolate, base tapered, margins entire, apex acute. Thyrses continuous or interrupted, cylindric, (1–) 2–15 cm, axis ± retrorsely hairy, verticillasters 1–5, cymes (2–) 6–13-flowered, 2 per node; proximal bracts lanceolate to linear, 8–38 × 1–8 mm, margins entire; peduncles and pedicels ascending to erect, glabrous or retrorsely hairy. Flowers: calyx lobes broadly ovate to obovate or elliptic, 1.7–3 × 0.9–2 mm, apex obtuse to acute or slightly cuspidate, glabrous; corolla violet to blue or purple, with faint reddish purple nectar guides, funnelform, 12–15 mm, glabrous externally, densely yellow-villous internally abaxially, tube 3–4 mm, throat gradually inflated, 3–4 mm diam., 2-ridged abaxially; stamens included or longer pair slightly exserted, pollen-sacs opposite, explanate, 0.4–0.8 mm, dehiscing completely, connective splitting, sides glabrous, sutures smooth; staminode 6–8 mm, included, 0.2–0.3 mm diam., tip straight to slightly recurved, distal 2–3 mm sparsely to densely villous, hairs yellow, to 0.7 mm; style 7–9 mm. Capsules 4.5–6 × 2.5–3.5 mm, glabrous.


Phenology: Flowering Jun–Jul.
Habitat: Dry meadows, sagebrush shrublands.
Elevation: 1700–2400 m.

Discussion

Penstemon laxus is known from south-central Idaho; populations are known in Blaine, Boise, and Elmore counties.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon laxus"
obtuse +  and acute or slightly cuspidate +
Craig C. Freeman +
A. Nelson +
alternate +, subopposite +, whorled +  and opposite +
glaucescent +
alternate +, opposite +, whorled +, helical +  and subopposite +
not leathery +
cauline +, proximal +  and basal +
rarely +, not glaucous +, glabrate +, pubescent +, hairy +, glandular-lanate +, glandular-pubescent +, puberulent +, glandular +  and glabrous +
not +  and leathery +
tapered +
lanceolate +
not +  and leathery +
broadly ovate;obovate or elliptic +
short-tubular +  and short-campanulate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
Lax beardtongue +
personate +, not personate +, bilabiate +  and symmetric +
violet +  and blue +
yellow-villous +  and glabrous +
ventricose +, tubular +  and tubular-funnelform +
ampliate +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
(2-)6-13-flowered +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
scale-like +  and not needlelike +
drupe-like +
1700–2400 m. +
curved +  and straight +
1 +  and 4 +
Dry meadows, sagebrush shrublands. +
0 cm0 mm <br />0 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
glutinous +
glandular-ciliolate +, hairy +, puberulent +, glabrescent +, glabrous +  and glandular-pubescent +
lacerate +, toothed +  and entire +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
ascending +  and erect +
hairy +  and glabrous +
ascending;erect +
hairy +  and glabrous +
5 +  and 4 +
Flowering Jun–Jul. +
navicular-sigmoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
1/5 +  and 2/3 +
0.8 cm8 mm <br />0.008 m <br /> (3.8 cm38 mm <br />0.038 m <br />) +
lanceolate +  and linear +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
minute +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
black +, gray +, brown +  and tan +
angled +  and slightly rounded +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
exserted +  and included +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (?) +  and 0.8 cm8 mm <br />0.008 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
glutinous +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
not glaucous +  and hairy +
30 cm300 mm <br />0.3 m <br /> (70 cm700 mm <br />0.7 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
papillate +
denticulate +
Penstemon watsonii subsp. laxus +
Penstemon laxus +
Penstemon sect. Penstemon +
species +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2-ridged +  and inflated +
not constricted +
interrupted +  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 /> (15 cm150 mm <br />0.15 m <br />) +
straight +
gibbous +  and not spurred +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +