Penstemon albidus

Nuttall

Gen. N. Amer. Pl. 2: 53. 1818.

Common names: White beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 128. Mentioned on page 125, 126.

Stems ascending to erect, (10–) 15–50 (–55) cm, retrorsely hairy proximally, glandular-pubescent distally. Leaves basal and cauline, not leathery, glabrate or puberulent to scabrous; basal and proximal cauline petiolate, 20–85 (–110) × (4–) 7–18 (–20) mm, blade oblanceolate or obovate to lanceolate, base tapered, margins entire to obscurely or distinctly serrate, apex obtuse to acute; cauline 2–5 (or 6) pairs, sessile or proximals short-petiolate, 25–65 × (3–) 7–19 (–21) mm, blade ovate to lanceolate, base tapered to clasping, margins entire or serrate to dentate, apex acute. Thyrses continuous or interrupted, cylindric, 4–24 (–30) cm, axis densely glandular-pubescent, verticillasters (2 or) 3–10, cymes 2–7-flowered, 2 per node; proximal bracts lanceolate, 17–65 × 3–17 mm; peduncles and pedicels densely glandular-pubescent. Flowers: calyx lobes ovate to lanceolate, 4–7 × 1.5–3 mm, glandular-pubescent; corolla white, rarely tinged pink or lavender, with red or reddish purple nectar guides, funnelform, (12–) 16–20 mm, glandular-pubescent internally, tube 4–6 mm, throat gradually inflated, not constricted at orifice, (4–) 6–8 mm diam., rounded abaxially; stamens included, pollen-sacs opposite, explanate, 0.7–1.1 mm, dehiscing completely, sutures smooth; staminode 8–9 mm, included, 0.3–0.4 mm diam., tip straight to recurved, distal 3–6 mm sparsely to moderately villous, hairs yellowish, to 1 mm; style 9–11 (–13) mm. Capsules 8–12 × 4–7 mm. 2n = 16.


Phenology: Flowering Apr–Jul(–Sep).
Habitat: Silty or gravelly soils, mixed-grass and shortgrass prairies.
Elevation: 300–1800 m.

Distribution

Alta., Man., Ont., Sask., Colo., Iowa, Kans., Minn., Mont., Nebr., N.Mex., N.Dak., Okla., S.Dak., Tex., Wyo.

Discussion

Penstemon albidus is remarkably uniform throughout its range. It probably is introduced in Ontario.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon albidus"
acute +  and obtuse +
Craig C. Freeman +
Nuttall +
glandular-pubescent +
alternate +, opposite +, whorled +, helical +  and subopposite +
tapered;tapered +
Penstemon +
ovate;lanceolate +
not +  and leathery +
glandular-pubescent +
ovate;lanceolate +
short-tubular +  and short-campanulate +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
glandular-pubescent +  and glabrous +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
White beardtongue +
not personate +, rarely nearly radially symmetric +  and weakly strongly bilabiate +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
lavender +, tinged pink +  and white +
glandular-pubescent +
ventricose +  and tubular-funnelform +
ampliate +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2-7-flowered +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
scale-like +  and not needlelike +
Alta. +, Man. +, Ont. +, Sask. +, Colo. +, Iowa +, Kans. +, Minn. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, S.Dak. +, Tex. +  and Wyo. +
drupe-like +
300–1800 m. +
curved +  and straight +
1 +  and 4 +
Silty or gravelly soils, mixed-grass and shortgrass prairies. +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
membranous +
terminal +  and axillary +
short-petiolate +, sessile +  and petiolate +
whorled +  and opposite +
persistent +  and deciduous +
basal +  and cauline +
puberulent +  and scabrous +
not leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
dentate +, serrate +  and entire +
glabrous +, puberulent +, hairy +, scabrous +, glandular-villous +  and glandular-pubescent +
toothed +  and entire +
scarious +  and herbaceous +
reddish purple +  and red +
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–Jul(–Sep). +
navicular-sigmoid +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
1/5 +  and 1/2 +
short-petiolate +
1.9 cm19 mm <br />0.019 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
1.7 cm17 mm <br />0.017 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
Gen. N. Amer. Pl. +
minute +
black +, dark-brown +  and brown +
angled +  and reniform or slightly rounded +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (?) +  and 0.9 cm9 mm <br />0.009 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
50 cm500 mm <br />0.5 m <br /> (55 cm550 mm <br />0.55 m <br />) +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
glandular-pubescent +  and hairy +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
glandular-pubescent +  and glabrous +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
papillate +  and smooth +
denticulate +
Penstemon sect. Albidi +
Penstemon albidus +
Penstemon sect. Cristati +
species +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
rounded +  and inflated +
not constricted +
interrupted +  and continuous +
24 cm240 mm <br />0.24 m <br /> (30 cm300 mm <br />0.3 m <br />) +
cylindric +
4 cm40 mm <br />0.04 m <br /> (24 cm240 mm <br />0.24 m <br />) +
straight +
gibbous +  and not spurred +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cauline +  and proximal +
acaulescent +  and caulescent +