Penstemon filiformis

(D. D. Keck) D. D. Keck in L. Abrams and R. S. Ferris

Ill. Fl. Pacific States 3: 761. 1951.

Common names: Thread-leaf beardtongue
Endemic
Basionym: Penstemon laetus subsp. filiformis D. D. Keck Univ. Calif. Publ. Bot. 16: 394. 1932
Treatment appears in FNA Volume 17. Treatment on page 233. Mentioned on page 231.
Revision as of 18:17, 29 July 2020 by imported>Volume Importer
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Herbs or subshrubs. Stems ascending to erect, 16–50 cm, puberulent to retrorsely hairy, hairs pointed, not glaucous. Leaves cauline, opposite, puberulent, hairs pointed, or glabrous, not glaucous; cauline 8–12 pairs, sessile, 12–70 × 0.5–1 (–2) mm, blade linear, base not tapered, margins entire, apex acute. Thyrses interrupted, cylindric, 9–22 cm, axis glandular-pubescent, verticillasters 1–5, cymes 1–3-flowered, (1 or) 2 per node; proximal bracts linear, 9–30 × 0.5–1 mm; peduncles and pedicels spreading to ascending, glandular-pubescent. Flowers: calyx lobes ovate to lanceolate, 2–4.5 × 0.7–1.7 mm, glandular-pubescent; corolla light purple to violet or purple, without nectar guides, funnelform, 13–18 mm, glandular-pubescent externally, glabrous internally, tube 3–4 mm, throat gradually inflated, 5–7 mm diam., 2-ridged abaxially; stamens included or longer pair reaching orifice, filaments glabrous, pollen-sacs parallel, 1.2–1.6 mm, distal 1/2 indehiscent, sides pubescent, hairs white, to 0.5 mm near filament attachment, sutures denticulate, teeth to 0.2 mm; staminode 10–12 mm, included or reaching orifice, 0.3–0.5 mm diam., glabrous; style 11–15 mm. Capsules 5–7.5 × 2.5–4 mm. 2n = 16.


Phenology: Flowering Jun–Jul.
Habitat: Rocky shrublands, pine woodlands.
Elevation: 400–600 m.

Discussion

Penstemon filiformis is known from Lake, Shasta, Siskiyou, and Trinity counties.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon filiformis"
Craig C. Freeman +
(D. D. Keck) D. D. Keck in L. Abrams and R. S. Ferris +
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 +
not tapered +
Penstemon laetus subsp. filiformis +
linear;oblong;linear;oblong;elliptic;lanceolate;oblanceolate;spatulate;ovate;obovate +
not +  and leathery +
glandular-pubescent +
ovate;lanceolate +
0.7mm;1.7mm +
short-tubular +  and short-campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Thread-leaf beardtongue +
not personate +  and bilabiate +
light purple +  and violet or purple +
glabrous +  and glandular-pubescent +
ventricose +
ventricose-ampliate +  and ampliate +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1-3-flowered +
scale-like +  and not needlelike +
drupe-like +
400–600 m. +
curved +  and straight +
1 +  and 4 +
Rocky shrublands, pine woodlands. +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
not glaucous +  and glabrous +
pointed +
0 cm0 mm <br />0 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
puberulent +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
erose +  and entire +
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–Jul. +
navicular-sigmoid +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Ill. Fl. Pacific States +
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 />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
included +  and exserted +
1 cm10 mm <br />0.01 m <br /> (?) +  and 1.2 cm12 mm <br />0.012 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
puberulent +  and retrorsely hairy +
16 cm160 mm <br />0.16 m <br /> (50 cm500 mm <br />0.5 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
papillate +
denticulate +
Penstemon subg. Saccanthera +
Penstemon filiformis +
Penstemon sect. Saccanthera +
species +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
2-ridged +  and inflated +
not constricted +
cylindric +
9 cm90 mm <br />0.09 m <br /> (22 cm220 mm <br />0.22 m <br />) +
straight +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
gibbous +  and not spurred +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
subshrub +  and herb +