Diplacus leptaleus

(A. Gray) G. L. Nesom

Phytoneuron 2012-39: 29. 2012.

Common names: Least-flowered monkeyflower
Endemic
Basionyms: Mimulus leptaleus A. Gray Proc. Amer. Acad. Arts 11: 96. 1876
Treatment appears in FNA Volume 17. Treatment on page 438. Mentioned on page 431.

Herbs, annual. Stems erect to ascending, 10–140 mm, glandular-puberulent to short glandular-villous. Leaves usually cauline, relatively even-sized; petiole absent; blade oblanceolate to linear, (5–) 6–24 (–34) × (0.5–) 1–4 (–7.5) mm, margins entire, plane, apex rounded to acute, surfaces glandular-puberulent. Pedicels 1 (–3) 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, (2.5–) 3–5.5 (–6.5) mm, glandular-puberulent, lobes subequal, apex acute, ribs darkened, blackish, intercostal areas purplish. Corollas magenta, sometimes white, throat whitish, often speckled with dark spots, palate ridges weak, whitish to pinkish, tube-throat 6–8 mm, limb 3–5 mm diam., not bilabiate. Anthers included, glabrous. Styles sparsely glandular-puberulent. Stigmas included, lobes unequal, abaxial nearly 2 times adaxial. Capsules (3–) 4–6 (–6.5) mm. 2n = 16.


Phenology: Flowering Jun–Aug.
Habitat: Developing granitic soils, boulders of granite outcrops, disturbed areas, water runoff areas.
Elevation: (1800–)2100–3400 m.

Discussion

Diplacus leptaleus occurs in the Sierra Nevada from Nevada County south to Tulare County, California, and in southern Washoe County, Nevada. Diplacus leptaleus is the only species of Diplacus that commonly produces white flowers. Populations rarely are fixed for white corollas; they are commonly fixed for magenta corollas, especially at higher elevations (D. M. Thompson 2005).

Selected References

None.

Lower Taxa

None.

... more about "Diplacus leptaleus"
2 times adaxial lobes +
Acute (?) +  and Rounded (?) +
Guy L. Nesom +  and Melissa C. Tulig +
(A. Gray) G. L. Nesom +
Mimulus leptaleus +
2.4 cm24 mm <br />0.024 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
oblanceolate;linear +
not +, leathery +  and not fleshy +
1mm;4mm +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
glandular-puberulent +
not inflated +
0.3 cm3 mm <br />0.003 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Least-flowered monkeyflower +
not +, rarely radially symmetric +  and weakly strongly bilabiate +
white;magenta +
Calif. +  and Nev. +
(1800–)2100–3400 m. +
hairy +  and glabrous +
reflexed;nodding;erect +
reduced +
compressed;asymmetrically ovoid;lanceoloid or nearly cylindric +
Developing granitic soils, boulders of granite outcrops, disturbed areas, water runoff areas. +
gland-tipped +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
equal-sized +
not bilabiate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
triangular;deltate +
unequal +  and subequal +
palmate +  and subpinnate +
wing-angled +  and angled +
2 +  and 1 +
chasmogamous +
basal +  and superior +
tenuinucellate +  and unitegmic +
orthotropous +  and anatropous +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
rarely more or less equal to or slightly longer +
1 cm10 mm <br />0.01 m <br /> (?) +
Flowering Jun–Aug. +
Phytoneuron +
blackish +  and darkened +
flattened +, ovoid +  and oblong +
deciduous +
erect;ascending +
1 cm10 mm <br />0.01 m <br /> (14 cm140 mm <br />0.14 m <br />) +
glandular-puberulent +
glandular-puberulent +
Eunanus +  and Mimulus sect. Diplacus +
Diplacus leptaleus +
Diplacus +
species +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
whitish +  and pinkish +
10 +, 9 +  and 8 +