Penstemon caespitosus

Nuttall ex A. Gray

Proc. Amer. Acad. Arts 6: 66. 1862.

Common names: Mat beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 100. Mentioned on page 99, 103, 107.

Stems prostrate, only tip ascending, 2–8 (–10) cm, not cinereous, retrorsely hairy, hairs pointed. Leaves not leathery, not cinereous, retrorsely hairy, hairs pointed; cauline 3–20 pairs, petiolate, 2.5–14 (–21) × 1–4 mm, blade obovate to spatulate, oblanceolate, or linear, base tapered, apex rounded to acute or mucronate. Thyrses continuous, cylindric to secund, 0.5–3 cm, axis retrorsely hairy to retrorsely cinereous, hairs pointed, sometimes also glandular-pubescent, verticillasters 1–5, cymes 1–3-flowered, 1 per node; proximal bracts linear, 2.8–13 (–17) × 0.7–3 mm; peduncles and pedicels ascending to erect, retrorsely hairy to retrorsely cinereous, hairs pointed, and glandular-pubescent. Flowers: calyx lobes lanceolate to linear, 4–6.5 (–8.5) × 1–1.5 (–1.9) mm, herbaceous or narrowly scarious-margined, retrorsely hairy, hairs pointed, and sparsely glandular-pubescent; corolla blue to purplish lavender or lavender, lined internally abaxially with reddish violet nectar guides, funnelform, 10–17 (–21) mm, yellow-villous internally abaxially, tube 5–6 mm, throat gradually inflated, 4.5–6 mm diam., 2-ridged abaxially; stamens: longer pair reaching orifice or exserted, filaments glabrous, pollen-sacs opposite, navicular to explanate, 0.6–1.2 mm, sutures papillate; staminode 9–12 mm, reaching orifice, flattened distally, 0.3–0.5 mm diam., tip straight to recurved, distal 7–9 mm densely pilose, hairs golden yellow, to 1 mm; style 13–15 mm. Capsules 3.5–5 × 3–4 mm.

Discussion

Varieties 3 (3 in the flora).

The varieties of Penstemon caespitosus are weakly differentiated and largely allopatric.

Selected References

None.

Key

1 Pollen sacs 0.9–1.2 mm; leaf blades oblanceolate; Arizona, Utah. Penstemon caespitosus var. desertipicti
1 Pollen sacs 0.6–0.9 mm; leaf blades obovate, spatulate, oblanceolate, or linear; Colorado, Utah, Wyoming. > 2
2 Leaf blades oblanceolate to linear; pollen sacs explanate, 0.6–0.8 mm; Colorado, Utah, Wyoming. Penstemon caespitosus var. caespitosus
2 Leaf blades obovate or spatulate; pollen sacs navicular to subexplanate, 0.8–0.9 mm; Colorado, Utah. Penstemon caespitosus var. perbrevis

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

... more about "Penstemon caespitosus"
rounded +  and acute or mucronate +
Craig C. Freeman +
Nuttall ex A. Gray +
alternate +, opposite +, whorled +, helical +  and subopposite +
tapered +
Penstemon +
obovate;spatulate oblanceolate or linear +
not +  and leathery +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
scarious-margined +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
lanceolate;linear +
short-tubular +  and short-campanulate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1.4 cm14 mm <br />0.014 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Mat beardtongue +
1.7 cm17 mm <br />0.017 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
lavender +  and purplish lavender +
yellow-villous +
salverform +  and tubular-funnelform +
ampliate +  and ventricose-ampliate +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
1-3-flowered +
scale-like +  and not needlelike +
Ariz. +, Colo. +, Utah +  and Wyo. +
drupe-like +
curved +  and straight +
1 +  and 4 +
golden yellow +
glandular-pubescent +
pointed +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
membranous +
terminal +  and axillary +
not cinereous +
persistent +  and deciduous +
cauline +, proximal +  and basal +
not leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
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 +
navicular-sigmoid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.28 cm2.8 mm <br />0.0028 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Proc. Amer. Acad. Arts +
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 />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
included +  and exserted +
0.9 cm9 mm <br />0.009 m <br /> (?) +  and 1.2 cm12 mm <br />0.012 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
climbing +  and scrambling +
decumbent;ascending;decumbent;ascending;erect;prostrate +
not glaucous +, glabrous +  and hairy +
1.3 cm13 mm <br />0.013 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
papillate +
denticulate +
Penstemon caespitosus +
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 +
secund +  and continuous +
cylindric +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
not cinereous +
straight +
recurved +  and ascending +
pilose +  and hairy +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
gibbous +  and not spurred +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
subshrub +  and cespitose +