Penstemon angustifolius

Pursh

Fl. Amer. Sept. 2: 738. 1813.

Common names: Narrow-leaf beardtongue
IllustratedEndemic
Treatment appears in FNA Volume 17. Treatment on page 113. Mentioned on page 111, 112, 114.

Stems ascending to erect, (6–) 15–45 (–65) cm, glabrous or scabrous. Leaves basal and cauline, basal not reduced, glabrous, sometimes scabrous; basal and proximal cauline (25–) 40–90 × 2–18 mm, blade spatulate to oblanceolate or linear, base tapered, apex rounded to obtuse or acute; cauline 2–8 pairs, sessile, 18–113 × 2–24 (–40) mm, blade ovate to lanceolate or linear, base tapered to cordate-clasping, apex acute to acuminate. Thyrses continuous or interrupted, cylindric, (2–) 5–30 (–37) cm, axis glabrous, rarely scabrous, verticillasters (3–) 5–15 (–26), cymes (2–) 4–8 (–10) -flowered; proximal bracts ovate to lanceolate or linear, (3–) 12–98 × (1–) 2–28 mm; peduncles and pedicels glabrous or scabrous, peduncles to 3 mm. Flowers: calyx lobes ovate to lanceolate, 4–8 × 1–2.5 mm, margins entire or erose, broadly scarious, glabrous or scabrous; corolla lavender, blue, or pink, with violet or reddish purple nectar guides, tubular-funnelform, 13–20 (–22) mm, glabrous externally, sparsely white-pubescent internally abaxially or glabrous, tube 6–8 mm, throat gradually inflated, 4–6 mm diam., rounded abaxially; stamens included or longer pair reaching orifice, pollen-sacs opposite, (0.9–) 1.1–1.5 mm, sutures papillate; staminode 8–10 mm, reaching orifice, 0.9–1.2 mm diam., tip recurved, distal 4–6 mm sparsely villous, hairs golden yellow, to 1 mm, hairs on proximal part of staminode mostly along margins; style 8–12 mm. Capsules 9–15 × 5–7 mm.

Distribution

Ariz., Colo., Kans., Mont., N.Dak., N.Mex., Nebr., Okla., S.Dak., Utah, Wyo.

Discussion

Varieties 5 (5 in the flora).

Penstemon angustifolius comprises five varieties: two widespread in the west-central Great Plains and three with more limited, allopatric ranges.

Selected References

None.

Key

1 Corollas pink; cauline leaf blades lanceolate to linear; Juab and Millard counties, Utah. Penstemon angustifolius var. dulcis
1 Corollas blue or lavender, rarely pink; cauline leaf blades ovate to lanceolate or linear (if corollas pink, leaf blades broader or plants not of Juab or Millard counties, Utah); Arizona, Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Utah, Wyoming. > 2
2 Cauline leaf blades and proximal bracts lanceolate to linear. > 3
3 Stems glabrous or scabrous; corollas 14–18 mm; cauline leaves 2–5(or 6) pairs; stems (6–)10–30 cm; Colorado, Montana, Nebraska, North Dakota, South Dakota, Wyoming. Penstemon angustifolius var. angustifolius
3 Stems glabrous, rarely scabrous; corollas (14–)18–20(–22) mm; cauline leaves 4–7 pairs; stems (8–)15–45 cm; Colorado, Utah. Penstemon angustifolius var. vernalensis
2 Cauline leaf blades and proximal bracts ovate to lanceolate. > 4
4 Corollas 13–20(–22) mm, blue, rarely lavender or pink; Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Wyoming. Penstemon angustifolius var. caudatus
4 Corollas 14–17 mm, blue to lavender or pink; Arizona, Colorado, New Mexico, Utah. Penstemon angustifolius var. venosus

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

... more about "Penstemon angustifolius"
acute +  and acuminate +
Craig C. Freeman +
glutinous +
alternate +, opposite +, whorled +, helical +  and subopposite +
not reduced +
tapered;tapered +
ovate;lanceolate or linear +
not +  and leathery +
ovate;lanceolate +
short-tubular +  and short-campanulate +
0.9 cm9 mm <br />0.009 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
2.4 cm24 mm <br />0.024 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (11.3 cm113 mm <br />0.113 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
Narrow-leaf beardtongue +
not personate +  and bilabiate +
2 cm20 mm <br />0.02 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
pink +, blue +  and lavender +
glabrous +  and white-pubescent +
tubular-funnelform +
ampliate +
1.3 cm13 mm <br />0.013 m <br /> (2 cm20 mm <br />0.02 m <br />) +
(2-)4-8(-10)-flowered +
scale-like +  and not needlelike +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Ariz. +, Colo. +, Kans. +, Mont. +, N.Dak. +, N.Mex. +, Nebr. +, Okla. +, S.Dak. +, Utah +  and Wyo. +
drupe-like +
curved +  and straight +
1 +  and 4 +
golden yellow +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
membranous +
terminal +  and axillary +
persistent +  and deciduous +
cauline +  and basal +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
erose +  and entire +
glutinous +
scabrous +  and glabrous +
toothed +  and entire +
reddish purple +  and violet +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
ascending +  and erect +
scabrous +  and glabrous +
ascending;erect +
scabrous +  and glabrous +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
5 +  and 4 +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
navicular-sigmoid +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 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 /> (9.8 cm98 mm <br />0.098 m <br />) +
ovate +  and lanceolate or linear +
0.2 cm2 mm <br />0.002 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
Fl. Amer. Sept. +
minute +
dark-brown +  and brown +
disciform +, angled-elongate +  and angled +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.54 cm5.4 mm <br />0.0054 m <br />) +
Illustrated +  and Endemic +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
included +  and exserted +
0.8 cm8 mm <br />0.008 m <br /> (?) +  and 1 cm10 mm <br />0.01 m <br /> (?) +
short-petiolate +  and petiolate +
45 cm450 mm <br />0.45 m <br /> (65 cm650 mm <br />0.65 m <br />) +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
cauline +, proximal +  and basal +
scabrous +  and glabrous +
reduced +
15 cm150 mm <br />0.15 m <br /> (45 cm450 mm <br />0.45 m <br />) +
leathery +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
papillate +
denticulate +
Penstemon angustifolius +
Penstemon sect. Coerulei +
species +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
rounded +  and inflated +
not constricted +
interrupted +  and continuous +
30 cm300 mm <br />0.3 m <br /> (37 cm370 mm <br />0.37 m <br />) +
cylindric +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 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 />) +
short-petiolate +  and sessile +
cauline +  and proximal +