Penstemon rydbergii

A. Nelson

Bull. Torrey Bot. Club 25: 281. 1898.

Common names: Rydberg’s beardtongue
IllustratedEndemic
Treatment appears in FNA Volume 17. Treatment on page 220. Mentioned on page 187, 205, 213, 221.

Herbs. Stems decumbent, ascending, or erect, 20–70 (–120) cm, glabrous or retrorsely hairy, sometimes only in lines, not glaucous. Leaves basal and cauline, not leathery, glabrous; basal and proximal cauline (25–) 35–70 (–150) × (5–) 10–15 (–22) mm, blade oblanceolate to elliptic, base tapered, margins entire, apex obtuse to acute, rarely mucronate; cauline 3–6 pairs, sessile or proximals short-petiolate, 25–70 (–110) × 3–24 mm, blade lanceolate to elliptic or oblong, base tapered to clasping, margins entire, apex obtuse to acute. Thyrses interrupted, cylindric, 3–10 (–18) cm, axis retrorsely hairy or puberulent, sometimes glabrous, verticillasters (1 or) 2–7, cymes (3–) 5–11-flowered, 2 per node; proximal bracts lanceolate, (4–) 11–52 (–70) × (1–) 2–18 mm, margins entire or erose to lacerate; peduncles and pedicels erect, glabrous, retrorsely hairy, or puberulent. Flowers: calyx lobes oblong to ovate or obovate, 3–8 × 1.2–3.5 mm, apex acute to acuminate or short to long-caudate, glabrous or puberulent; corolla violet to blue or purple, without nectar guides, funnelform, 10–20 mm, glabrous externally, sparsely white or yellowish villous internally abaxially, tube 3–4 mm, throat gradually inflated, 3–4.5 mm diam., 2-ridged abaxially; stamens: longer pair reaching orifice or exserted, pollen-sacs opposite, navicular, 0.5–1.1 mm, dehiscing completely, connective splitting, sides glabrous, sutures smooth or ± papillate; staminode 6–7 mm, reaching orifice, 0.2–0.4 mm diam., tip straight, distal 1.5–2 mm moderately to densely pilose, hairs golden yellow, to 1 mm; style 8–10 mm. Capsules 4–5 × 3–4 mm, glabrous.

Distribution

Ariz., Calif., Colo., Idaho, Mont., N.Mex., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Varieties 3 (3 in the flora).

As treated here, Penstemon rydbergii includes three partially sympatric varieties. D. D. Keck (1945) treated the same taxa as four species and two subspecies (P. hesperius, P. oreocharis, P. rydbergii subsp. aggregatus, P. rydbergii subsp. rydbergii, and P. vaseyanus).

Selected References

None.

Key

1 Calyx lobe margins lacerate, rarely erose, broadly scarious, apices acuminate or short- to long-caudate; proximal bract margins erose to lacerate proximally, sometimes entire; thyrse axes retrorsely hairy or puberulent. Penstemon rydbergii var. rydbergii
1 Calyx lobe margins erose, sometimes lacerate, narrowly to broadly scarious, apices acute, acuminate, or short-caudate; proximal bract margins entire; thyrse axes glabrous or retrorsely hairy. > 2
2 Stems ± retrorsely hairy; thyrse axes glabrous or retrorsely hairy; corollas (10–)13–20 mm; pollen sacs (0.6–)0.8–1.1 mm. Penstemon rydbergii var. aggregatus
2 Stems glabrous, rarely ± retrorsely hairy; thyrse axes glabrous, rarely ± retrorsely hairy; corollas 10–14 mm; pollen sacs 0.5–0.7(–0.8) mm. Penstemon rydbergii var. oreocharis

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

... more about "Penstemon rydbergii"
puberulent +  and glabrous +
long-caudate +, acute +  and acuminate +
Craig C. Freeman +
A. Nelson +
glabrous +, puberulent +  and hairy +
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 +
tapered;tapered +
lanceolate;elliptic or oblong +
not +  and leathery +
oblong;ovate or obovate +
1.2mm;3.5mm +
short-tubular +  and short-campanulate +
0.4 cm4 mm <br />0.004 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 />) +
petiolate +  and sessile +
Rydberg’s beardtongue +
personate +, not personate +, bilabiate +  and symmetric +
yellowish +, white +, violet +  and blue or purple +
villous +  and glabrous +
ventricose +, tubular +  and tubular-funnelform +
ampliate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
(3-)5-11-flowered +
scale-like +  and not needlelike +
Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Nev. +, Oreg. +, Utah +, Wash. +  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 +
basal +  and cauline +
not leathery +
orbiculate;linear;orbiculate;linear;truncate;oblanceolate;obovate;oblong;elliptic;round;lanceolate;ovate +
erose +  and entire +
glutinous +
glandular-ciliolate +, hairy +, puberulent +, glabrescent +, glabrous +  and glandular-pubescent +
lacerate +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
puberulent +, hairy +  and glabrous +
puberulent +, hairy +  and glabrous +
5 +  and 4 +
navicular-sigmoid +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
1/5 +  and 2/3 +
short-petiolate +
7 cm70 mm <br />0.07 m <br /> (11 cm110 mm <br />0.11 m <br />) +
5.2 cm52 mm <br />0.052 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (5.2 cm52 mm <br />0.052 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
Bull. Torrey Bot. Club +
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 />) +
Illustrated +  and Endemic +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
included +  and exserted +
0.6 cm6 mm <br />0.006 m <br /> (?) +  and 0.7 cm7 mm <br />0.007 m <br /> (?) +
subalternate +, alternate +, whorled +  and opposite +
70 cm700 mm <br />0.7 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
glutinous +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
erect;ascending;erect;ascending;decumbent +
not glaucous +, hairy +  and glabrous +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
papillate +  and smooth +
denticulate +
Penstemon rydbergii +
Penstemon sect. Penstemon +
species +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
2-ridged +  and inflated +
not constricted +
10 cm100 mm <br />0.1 m <br /> (18 cm180 mm <br />0.18 m <br />) +
cylindric +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
gibbous +  and not spurred +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cauline +  and proximal +