Diplacus vandenbergensis

(D. M. Thompson) G. L. Nesom

Phytoneuron 2012-47: 2. 2012.

Common names: Vandenberg monkeyflower
Endemic
Basionym: Mimulus fremontii var. vandenbergensis D. M. Thompson Syst. Bot. Monogr. 75: 134, fig. 53G, plate 6b. 2005
Treatment appears in FNA Volume 17. Treatment on page 432. Mentioned on page 428.

Herbs, annual. Stems erect, 10–200 (–240) mm, glandular-puberulent or glandular-pubescent. Leaves basal and cauline, basal in rosette, cauline reduced distally; petiole absent; blade narrowly elliptic, sometimes obovate to oblanceolate, 2–30 (–55) × 1–10 (–16) mm, margins entire, sometimes crenate to serrate, plane, not ciliate, apex rounded to acute, surfaces: proximals glabrous, distals glandular-puberulent or glandular-pubescent. Pedicels 1–4 (–7 on proximal) mm in fruit. Flowers 1 per node, chasmogamous. Calyces inflated in fruit, 5–14 mm, glandular-puberulent to glandular-pubescent or ribs almost tomentose and viscid, lobes subequal, apex rounded and apiculate or acute, intercostal areas white. Corollas yellow with reddish-brown spots near mouth, palate ridges yellow, throat floor puberulent, tube-throat (9–) 10–23 mm, limb 8–26 mm diam., not bilabiate. Anthers included, glabrous, rarely minutely puberulent. Styles minutely puberulent. Stigmas included, lobes equal. Capsules 6.5–13 (–14) mm. 2n = 16.


Phenology: Flowering Apr–Jun.
Habitat: Sandy open or disturbed areas, among shrubs.
Elevation: 70–150 m.

Discussion

Diplacus vandenbergensis is endemic to Santa Barbara County, mostly on the north side of the city of Lompoc (La Purisima Mission State Historic Park; also on and near Vandenberg Air Force Base) plus one other locality about 10 kilometers farther west (Santa Ynez Valley, 8 miles west of Buellton). Thompson described Mimulus fremontii var. vandenbergensis as a geographically distinct variant of M. fremontii. The discontinuous morphological difference, allopatric/parapatric geographical distribution, and lack of intergrading populations support recognition of the plants with yellow corollas at specific rank. Plants with yellow corollas are found in D. bicolor, D. mephiticus, and D. parryi, but these morphs are found through most of the geographic ranges of these taxa and sometimes are intermixed in populations.

Selected References

None.

Lower Taxa

None.
... more about "Diplacus vandenbergensis"
puberulent +  and glabrous +
Acute (?) +, Apiculate (?) +  and Rounded (?) +
Guy L. Nesom +  and Melissa C. Tulig +
(D. M. Thompson) G. L. Nesom +
Mimulus fremontii var. vandenbergensis +
3 cm30 mm <br />0.03 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (3 cm30 mm <br />0.03 m <br />) +
obovate;oblanceolate +
? (?) +, ? (?) +  and ? (?) +
1mm;10mm +
glandular-puberulent +  and glandular-pubescent +
inflated +
0.5 cm5 mm <br />0.005 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.65 cm6.5 mm <br />0.0065 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Vandenberg monkeyflower +
not +, rarely radially symmetric +  and weakly strongly bilabiate +
glandular-pubescent +  and glandular-puberulent +
70–150 m. +
hairy +  and glabrous +
reflexed;nodding;erect +
reduced +
compressed;asymmetrically ovoid;lanceoloid or nearly cylindric +
Sandy open or disturbed areas, among shrubs. +
gland-tipped +
alternate +, opposite +, rosulate +  and subrosulate +
persistent +  and deciduous +
cauline +  and basal +
not bilabiate +
0.8 cm8 mm <br />0.008 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
triangular;deltate +
subequal +
palmate +  and subpinnate +
plane +, crenate +  and serrate +
wing-angled +  and angled +
reddish-brown spots +
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 /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering Apr–Jun. +
Phytoneuron +
tomentose +
flattened +, ovoid +  and oblong +
deciduous +
1 cm10 mm <br />0.01 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Eunanus +  and Mimulus sect. Diplacus +
Diplacus vandenbergensis +
Diplacus +
species +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
10 +, 9 +  and 8 +