Diplacus johnstonii

(A. L. Grant) G. L. Nesom

Phytoneuron 2012-39: 29. 2012.

Common names: Johnston’s monkeyflower
Endemic
Basionym: Mimulus johnstonii A. L. Grant Ann. Missouri Bot. Gard. 11: 280. 1925
Treatment appears in FNA Volume 17. Treatment on page 433. Mentioned on page 430.

Herbs, annual. Stems erect, (10–) 30–200 (–300) mm, densely glandular-puberulent. Leaves basal and cauline, gradually reduced distally; petiole absent, bases of larger leaves often with petiolelike extensions; blade obovate or oblanceolate, sometimes elliptic, (4.5–) 7–25 (–32) × 2–12 (–15) mm, margins entire, plane, apex rounded to acute, surfaces densely glandular-puberulent. Pedicels 1–4 (–5) mm in fruit. Flowers 2 per node, or 1 or 2 per node on 1 plant, chasmogamous. Calyces symmetrically attached to pedicels, not inflated in fruit, (6–) 7–11 mm, glandular-puberulent, lobes unequal, apex acute to acuminate, ribs inconspicuous, intercostal areas reddish. Corollas magenta, darker and more reddish in throat and, often, along narrow radiating lines extending from throat onto midveins of lobes, throat usually with a large dark spot on each side of mouth on lateral walls, palate ridges and throat floor yellow with reddish spots, tube-throat 9–15 mm, limb 10–15 mm diam., not bilabiate. Anthers included, glabrous. Styles densely glandular-puberulent distally. Stigmas exserted or at opening of corolla tube-throat, lobes equal. Capsules 7–12 mm. 2n = 16.


Phenology: Flowering May–Aug.
Habitat: Steep, unstable scree slides, talus slopes, gravel slides, cracks in granite cliffs, ridges, washes, steep sand and gravel slopes, canyon bottoms, gravelly road banks, recent burns, desert scrub, chaparral, juniper, pinyon-juniper, lodgepole pine, yellow pine, Jeffrey pine, and Jeffrey pine-western white pine-fir woodlands.
Elevation: (1000–)1300–2900 m.

Discussion

Populations of Diplacus johnstonii occur in Los Angeles, Riverside, San Bernardino, Santa Barbara, and Ventura counties. The populations in northwestern Los Angeles, Santa Barbara, and Ventura counties were noted by D. M. Thompson (2005) to be intermediate between D. constrictus and D. johnstonii.

Selected References

None.

Lower Taxa

None.
... more about "Diplacus johnstonii"
Acute (?) +  and Acuminate (?) +
Guy L. Nesom +  and Melissa C. Tulig +
(A. L. Grant) G. L. Nesom +
Mimulus johnstonii +
2.5 cm25 mm <br />0.025 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
oblanceolate;obovate +
? (?) +, ? (?) +  and ? (?) +
2mm;12mm +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
glandular-puberulent +
not inflated +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Johnston’s monkeyflower +
not +, rarely radially symmetric +  and weakly strongly bilabiate +
reddish;darker;magenta +
(1000–)1300–2900 m. +
petiole-like +
hairy +  and glabrous +
reflexed;nodding;erect +
reduced +
compressed;asymmetrically ovoid;lanceoloid or nearly cylindric +
Steep, unstable scree slides, talus slopesSteep, unstable scree slides, talus slopes, gravel slides, cracks in granite cliffs, ridges, washes, steep sand and gravel slopes, canyon bottoms, gravelly road banks, recent burns, desert scrub, chaparral, juniper, pinyon-juniper, lodgepole pine, yellow pine, Jeffrey pine, and Jeffrey pine-western white pine-fir woodlands.rey pine-western white pine-fir woodlands. +
gland-tipped +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
cauline +  and basal +
reduced +
not bilabiate +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
triangular;deltate +
unequal +
palmate +  and subpinnate +
wing-angled +  and angled +
2 +  and 1 +
chasmogamous +
basal +  and superior +
tenuinucellate +  and unitegmic +
orthotropous +  and anatropous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
rarely more or less equal to or slightly longer +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering May–Aug. +
Phytoneuron +
inconspicuous +
flattened +, ovoid +  and oblong +
deciduous +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
at opening +  and exserted +
glandular-puberulent +
glandular-puberulent +
Eunanus +  and Mimulus sect. Diplacus +
Diplacus johnstonii +
Diplacus +
species +
0.9 cm9 mm <br />0.009 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
yellow +  and dark spot +
10 +, 9 +  and 8 +