Diplacus layneae

(Greene) G. L. Nesom

Phytoneuron 2012-39: 29. 2012.

Common names: Layne’s monkeyflower
IllustratedEndemic
Basionyms: Eunanus layneae Greene Bull. Calif. Acad. Sci. 1: 104. 1885
Synonyms: Mimulus brachiatus Pennell M. layneae (Greene) Jepson
Treatment appears in FNA Volume 17. Treatment on page 437. Mentioned on page 431, 436, 438.

Herbs, annual, herbage usually drying dark. Stems erect, 30–160 (–300) mm, nodes 3–6, glandular-puberulent to glandular-pubescent, hairs 0.2–0.8 mm. Leaves usually cauline, relatively even-sized; petiole weakly delimited; blade elliptic to narrowly elliptic, oblanceolate, elliptic-oblanceolate, or elliptic-lanceolate, 8–27 (–35) × 2–8 mm, margins entire, rarely toothed, plane, apex rounded to obtuse, surfaces: proximals often glabrate, distals glandular-puberulent or glandular-pubescent. Pedicels 2–4 (–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, (5–) 6–8 (–9) mm, glandular-puberulent to glandular-pubescent, tube strongly plicate, lobes triangular, subequal, apex acute, ribs broad, darkened, blackish, thickened, strongly raised, intercostal areas whitish, membranous. Corollas pinkish or pale to dark magenta or red-purple, each lobe usually with a faint to dark medial line extending 1/2 or less to tip, throat floor yellowish near base, mostly white with red-purple dots near mouth, palate ridges white, tube-throat 10–15 mm, limb (8–) 10–16 mm diam., not bilabiate. Anthers included, ciliate. Styles glandular-puberulent. Stigmas included, lobes unequal, abaxial 1.5 times adaxial. Capsules 6–10 (–13) mm. 2n = 16.


Phenology: Flowering May–Aug.
Habitat: Road banks, serpentine, granitic sand, red clay, lava beds and volcanic soils, openings in chaparral, shallow dry streambeds or stream banks, burned or otherwise disturbed open areas.
Elevation: (100–)400–2400 m.

Discussion

D. M. Thompson (2005) observed that two forms of Diplacus layneae co-occur from the Yosemite National Park area southward; one of these is recognized here as D. graniticola.

Selected References

None.

Lower Taxa

None.

... more about "Diplacus layneae"
1.5 times adaxial lobes +
Acute (?) +, Rounded (?) +  and Obtuse (?) +
Guy L. Nesom +  and Melissa C. Tulig +
(Greene) G. L. Nesom +
Eunanus layneae +
2.7 cm27 mm <br />0.027 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
elliptic-lanceolate;elliptic-oblanceolate;elliptic-lanceolate;elliptic-oblanceolate;oblanceolate;elliptic;elliptic to narrowly +
not +, leathery +  and not fleshy +
2mm;8mm +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
glandular-puberulent +  and glandular-pubescent +
not inflated +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Layne’s monkeyflower +
not +, rarely radially symmetric +  and weakly strongly bilabiate +
pale;dark magenta or red-purple +
glandular-pubescent +  and glandular-puberulent +
(100–)400–2400 m. +
hairy +  and glabrous +
reflexed;nodding;erect +
reduced +
compressed;asymmetrically ovoid;lanceoloid or nearly cylindric +
Road banks, serpentine, granitic sand, red clay, lava beds and volcanic soils, openings in chaparral, shallow dry streambeds or stream banks, burned or otherwise disturbed open areas. +
gland-tipped +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
equal-sized +
not bilabiate +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
triangular +
unequal +  and subequal +
palmate +  and subpinnate +
plane +  and toothed +
wing-angled +  and angled +
red-purple dots +
glandular-puberulent;glandular-pubescent +
2 +, 1 +, 3 +  and 6 +
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 +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering May–Aug. +
Phytoneuron +
blackish +  and darkened +
flattened +, ovoid +  and oblong +
Illustrated +  and Endemic +
deciduous +
3 cm30 mm <br />0.03 m <br /> (16 cm160 mm <br />0.16 m <br />) +
glandular-puberulent +
Mimulus brachiatus +  and M. layneae +
Diplacus layneae +
Diplacus +
species +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
white +  and yellowish +
10 +, 9 +  and 8 +