Penstemon retrorsus

Payson ex Pennell

Contr. U.S. Natl. Herb. 20: 373. 1920.

Common names: Adobe beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 105. Mentioned on page 98, 99, 106.

Stems ascending to erect, 10–20 cm, retrorsely hairy, hairs pointed. Leaves not leathery, retrorsely hairy, hairs pointed; basal and proximal cauline 5–21 × 1–4 mm, blade spatulate to oblanceolate, base tapered, apex rounded to obtuse; cauline 2–4 pairs, petiolate or sessile, 8–30 × 2–5 mm, blade spatulate to oblanceolate, base tapered, apex rounded to obtuse, acute, or mucronate. Thyrses continuous, cylindric, 3–12 cm, axis retrorsely hairy, hairs pointed, verticillasters 4–12, cymes 1–4-flowered, 1 or 2 per node; proximal bracts oblanceolate, 11–22 × 2–3 mm; peduncles and pedicels ascending to erect, retrorsely hairy, hairs pointed. Flowers: calyx-tube 1.5–2 mm, lobes lanceolate to oblong, 3.5–4.5 × 0.7–1.2 mm, herbaceous or narrowly scarious-margined, retrorsely hairy, hairs pointed; corolla bluish violet, lined internally abaxially with reddish violet nectar guides, tubular-funnelform, 16–20 mm, sparsely white-lanate internally abaxially, tube 6–7 mm, throat gradually inflated, 4.5–6 mm diam., 2-ridged abaxially; stamens included, filaments glabrous, pollen-sacs opposite, subexplanate, 0.7–0.9 mm, sutures papillate; staminode 7–9 mm, included or reaching orifice, flattened distally, 0.2–0.3 mm diam., tip recurved, distal 4–6 mm pubescent, hairs yellowish orange, to 0.8 mm; style 12–15 mm. Capsules not seen.


Phenology: Flowering May–Jun.
Habitat: Clay soils, sagebrush, saltbush shrublands, pinyon-juniper woodlands.
Elevation: 1500–2500 m.

Discussion

Penstemon retrorsus is known only from Delta and Montrose counties, where populations occur on barren hills of the Mancos Shale. It is unique in having calyx tubes roughly as long as the calyx lobes.

Selected References

None.

Lower Taxa

None.

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

... more about "Penstemon retrorsus"
rounded +  and obtuse acute or mucronate +
Craig C. Freeman +
Payson ex Pennell +
alternate +, opposite +, whorled +, helical +  and subopposite +
tapered;tapered +
Penstemon +
spatulate;oblanceolate +
not +  and leathery +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
short-tubular +  and short-campanulate +
sessile +  and petiolate +
0.8 cm8 mm <br />0.008 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sessile +  and petiolate +
Adobe beardtongue +
bluish violet +
white-lanate +
tubular-funnelform +
ampliate +  and ventricose-ampliate +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1-4-flowered +
2 +  and 1 +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
scale-like +  and not needlelike +
drupe-like +
1500–2500 m. +
curved +  and straight +
1 +  and 4 +
Clay soils, sagebrush, saltbush shrublands, pinyon-juniper woodlands. +
yellowish orange +
pointed +
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 +
cauline +, proximal +  and basal +
not leathery +
scarious-margined +
lanceolate;oblong +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
erose +  and entire +
glabrate +, hairy +  and glandular-pubescent +
toothed +  and entire +
herbaceous +  and scarious +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
ascending +  and erect +
ascending;erect +
5 +  and 4 +
Flowering May–Jun. +
navicular-sigmoid +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Contr. U.S. Natl. Herb. +
minute +
dark-brown +  and black +
angled +  and rounded +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
included +  and exserted +
0.7 cm7 mm <br />0.007 m <br /> (?) +  and 0.9 cm9 mm <br />0.009 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
ascending;erect +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
papillate +
denticulate +
Penstemon retrorsus +
Penstemon sect. Caespitosi +
species +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-ridged +  and inflated +
not constricted +
cylindric +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
straight +
gibbous +  and not spurred +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cauline +  and proximal +
subshrub +  and cespitose +