Diplacus thompsonii

G. L. Nesom

Phytoneuron 2013-46: 1, figs. 2, 3. 2013.

Common names: Thompson’s monkeyflower
IllustratedEndemic
Treatment appears in FNA Volume 17. Treatment on page 435. Mentioned on page 431, 436, 437.

Herbs, annual, herbage usually drying dark. Stems erect, 30–150 mm, nodes 3–6, internodes 1–6 mm, glandular-puberulent. Leaves usually cauline, relatively even-sized; petiole absent, proximal base narrowed to petiolelike extension; blade lanceolate or narrowly lanceolate to elliptic-lanceolate, 7–30 × 2–7 mm, margins entire, plane, apex 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, inflated in fruit, 7–9 mm, glandular-villous, tube strongly plicate, lobes narrowly triangular, subequal, apex acuminate to attenuate, ribs broad, darkened, blackish, thickened, strongly raised, intercostal areas whitish, membranous. Corollas dark magenta to red-purple, throat floor yellowish and red-dotted, with a red-purple midvein radiating onto base of each lobe of proximal lip, palate ridges yellow, tube-throat 10–14 mm, limb 6–10 mm diam., not bilabiate. Anthers included, ciliate. Styles puberulent. Stigmas included, lobes subequal. Capsules 7–9 mm. 2n = 16.


Phenology: Flowering May–Jul.
Habitat: Granitic soils and sands, sandy loam, outwash slopes, dry sagebrush flats, pinyon and Jeffrey pine woodlands.
Elevation: 1800–2600(–3000) m.

Discussion

Diplacus thompsonii is abundant along the eastern side of the Sierra Nevada in Inyo and southern Mono counties. D. M. Thompson (2005) identified these populations as intermediate between Mimulus nanus var. mephiticus and M. bigelovii; diagnostic features are more similar to those of the latter, especially the inflated and strongly wing-angled calyx and the non-bilabiate corollas. The range of D. thompsonii is within the northern limit of D. bigelovii var. cuspidatus, which is different in leaf morphology.

Selected References

None.

Lower Taxa

None.
... more about "Diplacus thompsonii"
Guy L. Nesom +  and Melissa C. Tulig +
G. L. Nesom +
0.7 cm7 mm <br />0.007 m <br /> (3 cm30 mm <br />0.03 m <br />) +
narrowly lanceolate;elliptic-lanceolate +
? (?) +, ? (?) +  and ? (?) +
2mm;7mm +
glandular-villous +
inflated +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Thompson’s monkeyflower +
not +, rarely radially symmetric +  and weakly strongly bilabiate +
dark magenta to red-purple +
1800–2600(–3000) m. +
hairy +  and glabrous +
reflexed;nodding;erect +
reduced +
compressed;asymmetrically ovoid;lanceoloid or nearly cylindric +
Granitic soils and sands, sandy loam, outwash slopes, dry sagebrush flats, pinyon and Jeffrey pine woodlands. +
gland-tipped +
glandular-puberulent +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
equal-sized +
not bilabiate +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
triangular +
subequal +
palmate +  and subpinnate +
wing-angled +  and angled +
2 +, 1 +, 3 +  and 6 +
chasmogamous +
basal +  and superior +
tenuinucellate +  and unitegmic +
orthotropous +  and anatropous +
rarely more or less equal to or slightly longer +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering May–Jul. +
Phytoneuron +
blackish +  and darkened +
flattened +, ovoid +  and oblong +
Illustrated +  and Endemic +
deciduous +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
glandular-puberulent +
Eunanus +  and Mimulus sect. Diplacus +
Diplacus thompsonii +
Diplacus +
species +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
yellowish and red-dotted +
10 +, 9 +  and 8 +