Penstemon pratensis

Greene

Leafl. Bot. Observ. Crit. 1: 165. 1906.

Common names: White-flower beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 215. Mentioned on page 186, 187.

Herbs. Stems ascending to erect, 15–40 (–65) cm, glabrous, not glaucous. Leaves basal and cauline, not leathery, glabrous; basal and proximal cauline (23–) 40–90 (–120) × 6–14 (–24) mm, blade spatulate to elliptic, base tapered, margins entire, apex rounded to obtuse or acute; cauline 3–6 pairs, sessile or proximals short to long-petiolate, 24–115 × 4–15 mm, blade oblanceolate to lanceolate, base tapered to truncate or clasping, margins entire, apex obtuse to acute. Thyrses interrupted, cylindric, 6–15 cm, axis glabrous, verticillasters 2–6, cymes 3–11-flowered, 2 per node; proximal bracts lanceolate, 8–50 × 1–8 mm, margins entire; peduncles and pedicels erect, glabrous. Flowers: calyx lobes ovate to lanceolate, 3–5.5 × 1.2–2.1 mm, apex acute to short-caudate, glabrous; corolla white or lavender, without nectar guides, funnelform, 10–15 mm, glabrous externally, moderately yellow or white-lanate internally abaxially, tube 4–5 mm, throat slightly inflated, 3–4 mm diam., 2-ridged abaxially; stamens: longer pair reaching orifice or slightly exserted, pollen-sacs opposite, navicular, 0.6–0.8 mm, dehiscing completely, connective splitting, sides glabrous, sutures smooth; staminode 6–7 mm, included, 0.3–0.4 mm diam., tip straight, distal 0.5–3 mm moderately pilose, hairs yellow, to 0.8 mm, rarely glabrous; style 7–8 mm. Capsules 4–7 × 3–4 mm, glabrous. 2n = 32.


Phenology: Flowering Jun–Jul.
Habitat: Moist meadows, stream banks, aspen woodlands.
Elevation: 1300–2800 m.

Discussion

Penstemon pratensis is known from the northern Central Great Basin and Owyhee Desert regions of the northern Great Basin. The species is documented in Owyhee County, Idaho, Elko and Eureka counties, Nevada, and Harney and Malheur counties, Oregon. In Elko County, Nevada, where it occurs with P. rydbergii var. oreocharis, P. pratensis appears to occur mostly in the East Humboldt Range and Ruby Mountains, south and east of the Humboldt River. Most populations of P. rydbergii var. oreocharis in that county occur north and west of the Humboldt River in the Independence and Jarbidge mountains.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon pratensis"
acute +  and short-caudate +
Craig C. Freeman +
Greene +
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 +
clasping;truncate +
tapered;tapered +
oblanceolate;lanceolate +
not +  and leathery +
ovate;lanceolate +
1.2mm;2.1mm +
short-tubular +  and short-campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
petiolate +  and sessile +
White-flower beardtongue +
personate +, not personate +, bilabiate +  and symmetric +
yellow +, lavender +  and white +
white-lanate +  and glabrous +
ventricose +, tubular +  and tubular-funnelform +
ampliate +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
3-11-flowered +
scale-like +  and not needlelike +
Idaho +, Nev. +  and Oreg. +
drupe-like +
1300–2800 m. +
curved +  and straight +
1 +  and 4 +
Moist meadows, stream banks, aspen woodlands. +
0 cm0 mm <br />0 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
basal +  and cauline +
not leathery +
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 +
5 +  and 4 +
Flowering Jun–Jul. +
navicular-sigmoid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
1/5 +  and 2/3 +
long-petiolate +
0.8 cm8 mm <br />0.008 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
2.4 cm24 mm <br />0.024 m <br /> (11.5 cm115 mm <br />0.115 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Leafl. Bot. Observ. Crit. +
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 />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (?) +  and 0.7 cm7 mm <br />0.007 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
40 cm400 mm <br />0.4 m <br /> (65 cm650 mm <br />0.65 m <br />) +
glutinous +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
not glaucous +  and glabrous +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
papillate +
denticulate +
Penstemon pratensis +
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 +
cylindric +
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
straight +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
gibbous +  and not spurred +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
cauline +  and proximal +