Penstemon oklahomensis

Pennell

Monogr. Acad. Nat. Sci. Philadelphia 1: 237. 1935.

Common names: Oklahoma beardtongue
IllustratedEndemic
Treatment appears in FNA Volume 17. Treatment on page 212. Mentioned on page 184, 185, 208, 213, 224.

Herbs. Stems ascending to erect, (15–) 35–55 cm, spreading-puberulent or retrorsely hairy proximally, glandular-pubescent medially and distally, not glaucous. Leaves basal and cauline, basal often withering by anthesis, not leathery, puberulent or retrorsely hairy; basal and proximal cauline 25–80 (–110) × 5–24 (–32) mm, blade spatulate to obovate, oblanceolate, or lanceolate, base tapered, margins subentire or ± denticulate or serrate, apex rounded to obtuse or acute; cauline 2–9 pairs, short-petiolate or sessile, (25–) 60–120 × 4–20 mm, blade lanceolate to linear, base tapered to clasping, margins entire or ± denticulate to serrate, apex acute. Thyrses interrupted, cylindric, (5–) 8–18 (–25) cm, axis glandular-pubescent, verticillasters (2 or) 3–6, cymes 2–4 (–6) -flowered, 2 per node; proximal bracts lanceolate to linear, 60 × 6 mm, margins entire; peduncles and pedicels ascending to erect, glandular-pubescent. Flowers: calyx lobes ovate to lanceolate, 5–7 × 3–4 mm, glandular-pubescent; corolla white to ochroleucous, without nectar guides, personate, tubular, 24–32 mm, glandular-pubescent externally, densely yellowish lanate internally abaxially, tube slightly differentiated from throat, 6–10 mm, throat slightly inflated, 6–8 mm diam., 2-ridged abaxially; stamens included, pollen-sacs divergent, navicular to subexplanate, 1–1.5 mm, dehiscing completely, connective splitting, sides glabrous, sutures papillate; staminode 18–20 mm, included or slightly exserted, 0.4–0.6 mm diam., tip straight, distal 14–16 mm ± villous, hairs yellowish orange, to 1.5 mm; style 20–22 mm. Capsules 8–13 × 3–5 mm, glabrous. 2n = 16.


Phenology: Flowering Apr–Jun.
Habitat: Tallgrass prairies, open woods.
Elevation: 200–300 m.

Discussion

Penstemon oklahomensis is known from 26 counties primarily in east-central Oklahoma and in Lamar County, Texas (J. N. Mink et al. 2010).

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon oklahomensis"
acute +, rounded +  and obtuse or acute +
Craig C. Freeman +
Pennell +
glandular-pubescent +
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 +
hairy +  and puberulent +
not leathery +
not +  and leathery +
tapered;tapered +
lanceolate;linear +
not +  and leathery +
glandular-pubescent +
ovate;lanceolate +
short-tubular +  and short-campanulate +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sessile +  and short-petiolate +
2.5 cm25 mm <br />0.025 m <br /> (6 cm60 mm <br />0.06 m <br />) +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
petiolate +  and sessile +
Oklahoma beardtongue +
yellowish +, white +  and ochroleucous +
lanate +  and glandular-pubescent +
ampliate +
2.4 cm24 mm <br />0.024 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
2-4(-6)-flowered +
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
scale-like +  and not needlelike +
Okla. +  and Tex. +
drupe-like +
200–300 m. +
curved +  and straight +
1 +  and 4 +
Tallgrass prairies, open woods. +
yellowish orange +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
cauline +  and basal +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
glutinous +
glandular-ciliolate +, hairy +, puberulent +, glabrescent +, glabrous +  and glandular-pubescent +
more or less denticulate +  and serrate +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
ascending +  and erect +
glandular-pubescent +
ascending;erect +
glandular-pubescent +
5 +  and 4 +
Flowering Apr–Jun. +
navicular-sigmoid +
1/5 +  and 2/3 +
60 cm600 mm <br />0.6 m <br /> (?) +
lanceolate +  and linear +
6 cm60 mm <br />0.06 m <br /> (?) +
Monogr. Acad. Nat. Sci. Philadelphia +
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 />) +
Illustrated +  and Endemic +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
exserted +  and included +
1.8 cm18 mm <br />0.018 m <br /> (?) +  and 2 cm20 mm <br />0.02 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
15 cm150 mm <br />0.15 m <br /> (35 cm350 mm <br />0.35 m <br />) +
glutinous +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
glaucous +, glandular-pubescent +, hairy +  and spreading-puberulent +
35 cm350 mm <br />0.35 m <br /> (55 cm550 mm <br />0.55 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
papillate +
denticulate +
Penstemon oklahomensis +
Penstemon sect. Penstemon +
species +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
2-ridged +  and inflated +
not constricted +
18 cm180 mm <br />0.18 m <br /> (25 cm250 mm <br />0.25 m <br />) +
cylindric +
8 cm80 mm <br />0.08 m <br /> (18 cm180 mm <br />0.18 m <br />) +
straight +
gibbous +  and not spurred +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
differentiated +
cauline +  and proximal +