Flora of North America species comparison

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Diplacus johnstonii

Diplacus mohavensis

Johnston's monkeyflower

Mohave monkeyflower, Mojave monkey-flower
Habit Herbs, annual. Herbs, annual.
Stems

erect, (10–)30–200(–300) mm, densely glandular-puberulent.

erect, (10–)20–100(–140) mm, terete.
Leaves

basal and cauline, gradually reduced distally;

petiole absent, bases of larger leaves often with petiole-like 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.

basal and cauline, relatively even-sized;

petiole absent;

blade narrowly elliptic to elliptic-lanceolate, (6–)7–27 × 1.2–8(–10) mm, margins entire, plane, apex obtuse to acute or acuminate, surfaces green, often red-purple tinted, usually glabrous, veins and margins glandular-puberulent or ciliate.
Pedicels

1–4(–5) mm in fruit.

2–5(–6) mm in fruit.
Flowers

2 per node, or 1 or 2 per node on 1 plant, chasmogamous.

2 per node, or 1 or 2 per node on 1 plant, chasmogamous.
Styles

densely glandular-puberulent distally.

sparsely glandular-puberulent.
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.

salverform-rotate, throat dark purplish brown without internal or external markings, floor purplish brown-pilose, lobes purplish brown basally with red veins, palate ridges absent, tube-throat 9–15(–18) mm, limb 8–11(–14) mm diam., not bilabiate.
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.

asymmetrically attached to pedicel, inflated in fruit, 7–15(–16) mm, glabrous or with glandular-puberulent veins, lobes unequal, apex acuminate, ribs and intercostal areas purplish brown.
Capsules

7–12 mm.

(7–)8–13 mm.
Anthers

included, glabrous.

included, glabrous or with a few hairs at base of flower pair.
Stigmas

exserted or at opening of corolla tube-throat, lobes equal.

included, lobes subequal.
2n

= 16.

= 16.

Diplacus johnstonii

Diplacus mohavensis
Phenology Flowering May–Aug. Flowering Apr–May.
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. Gravelly hillsides and slopes, limestone, granite, fine gravel in wash bottoms and edges, commonly with Larrea.
Elevation (1000–)1300–2900 m. ((3300–)4300–9500 ft.) 600–900 m. (2000–3000 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
from FNA
CA
[WildflowerSearch map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Diplacus mohavensis is known from San Bernardino County.

Diplacus mohavensis is similar to D. pictus in features of corolla morphology and color patterning, and the pair sometimes has been segregated as Mimulus sect. Mimulastrum A. Gray (for example, by D. M. Thompson 2005). Molecular data (P. M. Beardsley et al. 2004) indicate that D. mohavensis arose from within sect. Eunanus. It is distinct from other species of sect. Eunanus (and similar to D. pictus) in its salverform-rotate corollas with an abrupt tube-throat transition and vein-patterned limb. In D. mohavensis, the limb is purplish brown basally with red, irregularly patterned veins fading into a wide, whitish distal border; in D. pictus, the limb is all white, and the purplish brown vein patterning is more regular and not fading distally.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 433. FNA vol. 17, p. 444.
Parent taxa Phrymaceae > Diplacus Phrymaceae > Diplacus
Sibling taxa
D. angustatus, D. aridus, D. aurantiacus, D. bicolor, D. bigelovii, D. bolanderi, D. brandegeei, D. brevipes, D. calycinus, D. cascadensis, D. clevelandii, D. clivicola, D. compactus, D. congdonii, D. constrictus, D. cusickii, D. cusickioides, D. deschutesensis, D. douglasii, D. fremontii, D. grandiflorus, D. graniticola, D. jepsonii, D. kelloggii, D. layneae, D. leptaleus, D. linearis, D. longiflorus, D. mephiticus, D. mohavensis, D. nanus, D. ovatus, D. parryi, D. parviflorus, D. pictus, D. pulchellus, D. puniceus, D. pygmaeus, D. rattanii, D. rupicola, D. rutilus, D. thompsonii, D. torreyi, D. traskiae, D. tricolor, D. vandenbergensis, D. viscidus
D. angustatus, D. aridus, D. aurantiacus, D. bicolor, D. bigelovii, D. bolanderi, D. brandegeei, D. brevipes, D. calycinus, D. cascadensis, D. clevelandii, D. clivicola, D. compactus, D. congdonii, D. constrictus, D. cusickii, D. cusickioides, D. deschutesensis, D. douglasii, D. fremontii, D. grandiflorus, D. graniticola, D. jepsonii, D. johnstonii, D. kelloggii, D. layneae, D. leptaleus, D. linearis, D. longiflorus, D. mephiticus, D. nanus, D. ovatus, D. parryi, D. parviflorus, D. pictus, D. pulchellus, D. puniceus, D. pygmaeus, D. rattanii, D. rupicola, D. rutilus, D. thompsonii, D. torreyi, D. traskiae, D. tricolor, D. vandenbergensis, D. viscidus
Synonyms Mimulus johnstonii Mimulus mohavensis, Eunanus mohavensis
Name authority (A. L. Grant) G. L. Nesom: Phytoneuron 2012-39: 29. (2012) (Lemmon) G. L. Nesom: Phytoneuron 2012-39: 29. (2012)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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