Penstemon diphyllus

Rydberg

Mem. New York Bot. Gard. 1: 349. 1900.

Common names: Two-leaf beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 232. Mentioned on page 229, 233.

Subshrubs. Stems ascending to erect, (10–) 20–80 cm, retrorsely hairy, not glaucous. Leaves cauline, opposite, sometimes alternate, glabrous, not glaucous; cauline (4–) 7–10 pairs, sessile or proximals short-petiolate, 20–80 × 5–17 mm, blade elliptic to lanceolate or oblanceolate, base tapered, margins irregularly dentate or serrate, apex acute. Thyrses interrupted, cylindric, 3–25 (–50) cm, axis glandular-pubescent, verticillasters 4–10, cymes 1–11 (–18) -flowered, 1 or 2 per node; proximal bracts lanceolate, rarely ovate, 9–45 × 2–16 mm; peduncles and pedicels spreading to ascending, glandular-pubescent. Flowers: calyx lobes lanceolate, (2–) 3–5.2 × 0.9–1.3 mm, glandular-pubescent; corolla bluish lavender to violet or purple, with reddish purple nectar guides, funnelform, 13–19 mm, glandular-pubescent externally, glabrous internally or sparsely white-lanate abaxially, tube 5–6 mm, throat gradually inflated, 5–6 mm diam., rounded abaxially; stamens included, filaments glabrous or sparsely white-pubescent distally, pollen-sacs parallel, 0.9–1.3 mm, distal 1/2 indehiscent, sides glabrous, sutures denticulate, teeth to 0.1 mm; staminode 9–11 mm, reaching orifice or barely exserted, 0.4–0.5 mm diam., distal 1–4 mm sparsely to moderately lanate, hairs white or yellowish, to 1.5 mm; style 8–12 mm. Capsules 4–6 × 2.8–4.5 mm.


Phenology: Flowering Jun–Aug(–Sep).
Habitat: Talus slopes, cliffs, rocky banks.
Elevation: 1000–2300 m.

Discussion

Penstemon diphyllus occurs in northeastern Idaho, western Montana, and southeastern Washington (Whitman County).

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon diphyllus"
Craig C. Freeman +
Rydberg +
glandular-pubescent +
subalternate +, whorled +, alternate +  and opposite +
alternate +, opposite +, whorled +, helical +  and subopposite +
cauline +, proximal +  and basal +
not +, glaucous +, glandular-pubescent +, hirsute +, pilose +, canescent +, hairy +, puberulent +, glabrate +  and glabrous +
tapered +
elliptic;lanceolate or oblanceolate +
not +  and leathery +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
glandular-pubescent +
0.9mm;1.3mm +
short-tubular +  and short-campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Two-leaf beardtongue +
not personate +  and bilabiate +
bluish lavender +  and violet +
white-lanate +, or +, glabrous +  and glandular-pubescent +
ventricose +
ventricose-ampliate +  and ampliate +
1.3 cm13 mm <br />0.013 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
1-11(-18)-flowered +
2 +  and 1 +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
scale-like +  and not needlelike +
Idaho +, Mont. +  and Wash. +
drupe-like +
1000–2300 m. +
curved +  and straight +
white-pubescent +  and glabrous +
1 +  and 4 +
Talus slopes, cliffs, rocky banks. +
yellowish +  and white +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
membranous +
terminal +  and axillary +
alternate +  and opposite +
persistent +  and deciduous +
not glaucous +  and glabrous +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
erose +  and entire +
serrate +  and dentate +
ciliolate +, pubescent +, puberulent +, scabrous +, glandular-pubescent +  and glabrous +
lacerate +, laciniate-pinnatifid +, toothed +  and entire +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
spreading +  and ascending +
glandular-pubescent +
spreading;ascending +
glandular-pubescent +
5 +  and 4 +
Flowering Jun–Aug(–Sep). +
navicular-sigmoid +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
short-petiolate +
0.9 cm9 mm <br />0.009 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
ovate +  and lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
Mem. New York Bot. Gard. +
minute +
brown +, gray +  and tan +
patelliform +  and angled +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (?) +  and 1.1 cm11 mm <br />0.011 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
not glaucous +  and hairy +
20 cm200 mm <br />0.2 m <br /> (80 cm800 mm <br />0.8 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
papillate +
denticulate +
Penstemon subg. Saccanthera +
Penstemon diphyllus +
Penstemon sect. Saccanthera +
species +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
rounded +  and inflated +
not constricted +
25 cm250 mm <br />0.25 m <br /> (50 cm500 mm <br />0.5 m <br />) +
cylindric +
3 cm30 mm <br />0.03 m <br /> (25 cm250 mm <br />0.25 m <br />) +
straight +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
gibbous +  and not spurred +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +