Penstemon tenuiflorus

Pennell

Addisonia 4: 79, plate 160. 1919.

Common names: Eastern white-flower beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 223. Mentioned on page 184, 185, 208, 224.
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Herbs. Stems ascending to erect, 20–80 cm, retrorsely hairy and ± glandular-lanate, retrorse hairs sometimes few or distal only, not glaucous. Leaves basal and cauline, not leathery, moderately to densely glandular-lanate, especially along major veins abaxially; basal and proximal cauline 40–138 × 7–37 mm, blade spatulate to oblanceolate or elliptic, base tapered, margins entire or ± serrate to dentate, apex rounded to obtuse or acute; cauline 4–7 pairs, sessile or proximals sometimes petiolate, (11–) 20–110 × 3–30 (–40) mm, blade ovate to lanceolate, base truncate to clasping, sometimes tapered, margins entire or crenate-serrate to dentate, apex acute to acuminate. Thyrses interrupted, conic, (3–) 8–37 cm, axis moderately to densely glandular-pubescent to glandular-lanate, verticillasters 3–6 (or 7), cymes 3–10 (–13) -flowered, 2 per node; proximal bracts lanceolate, 6–40 × 1–10 mm, margins entire or ± serrate; peduncles and pedicels ascending, moderately to densely glandular-pubescent to glandular lanate. Flowers: calyx lobes ovate to broadly lanceolate, 2–5 × 1.3–2 mm, glandular-pubescent; corolla white, without nectar guides, personate, tubular, 21–28 mm, sparsely glandular-pubescent externally, moderately to densely white-villous internally abaxially, tube 6–8 mm, throat slightly inflated, 5–8 mm diam., 2-ridged abaxially; stamens included, pollen-sacs opposite, navicular to subexplanate, 1–1.2 mm, dehiscing completely, connective splitting, sides glabrous, sutures papillate; staminode 13–16 mm, exserted, 0.4–0.6 mm diam., tip straight, distal 10–12 mm moderately to densely pubescent, hairs yellow, to 1.6 mm; style 16–19 mm. Capsules 5–7 × 3–5 mm, glabrous.


Phenology: Flowering Apr–Jun.
Habitat: Dry woods, cedar glades, prairies, barrens, cliffs.
Elevation: 30–80 m.

Distribution

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Ala., Ky., Miss., Tenn.

Discussion

Penstemon tenuiflorus is concentrated in the Interior Low Plateaus region of western Kentucky, central Tennessee, and northwestern Alabama, and in the Black Belt subsection of the Coastal Plain of central Alabama and northeastern Mississippi.

R. K. Clements et al. (1998) observed that the leaves of Penstemon tenuiflorus bear both simple and stellate hairs, reporting only simple hairs on the leaves of closely related P. hirsutus. However, stellate hairs occur in the leaf axils of plants in some populations of P. hirsutus, and they are common on the stems. Stellate hairs also occur on other diploid, tubular-flowered eastern North American species, including P. arkansanus, P. australis, P. brevisepalus, P. canescens, P. laxiflorus, P. oklahomensis, and P. pallidus. Stellate hairs have not been observed on any of the polyploid, ventricose-flowered eastern North American species.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon tenuiflorus"
acute +  and acuminate +
Craig C. Freeman +
Pennell +
glandular-pubescent +  and glandular-lanate +
alternate +, subopposite +, whorled +  and opposite +
glaucescent +
alternate +, opposite +, whorled +, helical +  and subopposite +
cauline +, proximal +  and basal +
rarely +, not glaucous +, glabrate +, pubescent +, hairy +, glandular-lanate +, glandular-pubescent +, puberulent +, glandular +  and glabrous +
not +  and leathery +
truncate;clasping +
tapered;tapered +
ovate;lanceolate +
not +  and leathery +
glandular-pubescent +
ovate;broadly lanceolate +
short-tubular +  and short-campanulate +
0.5 cm5 mm <br />0.005 m <br /> - 0.7 cm7 mm <br />0.007 m <br /> +
0.3 cm3 mm <br />0.003 m <br /> - 0.5 cm5 mm <br />0.005 m <br /> +
petiolate +  and sessile +
Eastern white-flower beardtongue +
white-villous +  and glandular-pubescent +
ampliate +
2.1 cm21 mm <br />0.021 m <br /> - 2.8 cm28 mm <br />0.028 m <br /> +
3-10 - -13-flowered +
1 cm10 mm <br />0.01 m <br /> - 1.2 cm12 mm <br />0.012 m <br /> +
scale-like +  and not needlelike +
Ala. +, Ky. +, Miss. +  and Tenn. +
drupe-like +
30–80 m. +
curved +  and straight +
1 +  and 4 +
Dry woods, cedar glades, prairies, barrens, cliffs. +
0 cm0 mm <br />0 m <br /> - 0.16 cm1.6 mm <br />0.0016 m <br /> +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
basal +  and cauline +
glandular-lanate +
not leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
serrate +, entire +, dentate +  and crenate-serrate +
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 +
lanate +, glandular-pubescent +  and glandular +
lanate +, glandular-pubescent +  and glandular +
5 +  and 4 +
Flowering Apr–Jun. +
navicular-sigmoid +
1/5 +  and 2/3 +
1.1 cm11 mm <br />0.011 m <br /> - 2 cm20 mm <br />0.02 m <br /> +
3 cm30 mm <br />0.03 m <br /> - 4 cm40 mm <br />0.04 m <br /> +
0.6 cm6 mm <br />0.006 m <br /> - 4 cm40 mm <br />0.04 m <br /> +
0.1 cm1 mm <br />0.001 m <br /> - 1 cm10 mm <br />0.01 m <br /> +
2 cm20 mm <br />0.02 m <br /> - 11 cm110 mm <br />0.11 m <br /> +
0.3 cm3 mm <br />0.003 m <br /> - 3 cm30 mm <br />0.03 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 /> +
0.04 cm0.4 mm <br />4.0e-4 m <br /> - 0.06 cm0.6 mm <br />6.0e-4 m <br /> +
1.3 cm13 mm <br />0.013 m <br /> - ? +  and 1.6 cm16 mm <br />0.016 m <br /> - ? +
subalternate +, alternate +, whorled +  and opposite +
glutinous +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
glandular-lanate +  and hairy +
20 cm200 mm <br />0.2 m <br /> - 80 cm800 mm <br />0.8 m <br /> +
1.6 cm16 mm <br />0.016 m <br /> - 1.9 cm19 mm <br />0.019 m <br /> +
papillate +
denticulate +
Penstemon tenuiflorus +
Penstemon sect. Penstemon +
species +
0.5 cm5 mm <br />0.005 m <br /> - 0.8 cm8 mm <br />0.008 m <br /> +
2-ridged +  and inflated +
not constricted +
3 cm30 mm <br />0.03 m <br /> - 8 cm80 mm <br />0.08 m <br /> +
8 cm80 mm <br />0.08 m <br /> - 37 cm370 mm <br />0.37 m <br /> +
straight +
gibbous +  and not spurred +
0.6 cm6 mm <br />0.006 m <br /> - 0.8 cm8 mm <br />0.008 m <br /> +
cauline +  and proximal +