Flora of North America species comparison

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Diplacus layneae

Diplacus bigelovii

Layne's monkeyflower

Bigelow mimulus, Bigelow's monkeyflower
Habit Herbs, annual, herbage usually drying dark. 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.

erect, (10–)20–250(–320) mm, nodes 3–6, internodes 1–6 mm, glandular-pubescent to glandular-villous.
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.

usually cauline, relatively even-sized or reduced distally;

petiole absent, bases of largest leaves often long-tapered to petiole-like extensions;

blade obovate, elliptic, or oblanceolate, (5–)7–35(–50) × (2–)3–18(–26) mm, margins entire, rarely toothed, plane, apex abruptly acuminate, acute-acuminate, or cuspidate to long-tapering or long-acuminate, surfaces glandular-pubescent.
Pedicels

2–4(–5) mm in fruit.

1–4(–8) 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

glandular-puberulent.

glandular-puberulent.
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.

magenta with dark reddish spot on each side of mouth on interior lateral walls of throat, usually with reddish lines extending from throat onto midveins of lobes, throat floor yellow with reddish speckling and variable reddish markings, palate ridges yellow, tube-throat (9–)12–22 mm, limb 12–24 mm diam., not bilabiate.
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.

symmetrically attached to pedicels, inflated in fruit, 6–13(–15) mm, glandular-pubescent, tube strongly plicate, lobes slightly recurved, narrowly triangular, subequal, often slightly indurate, apex acuminate to attenuate, ribs broad, darkened, blackish, thickened, strongly raised, intercostal areas whitish, membranous.
Capsules

6–10(–13) mm.

(6–)7–13(–15) mm.
Anthers

included, ciliate.

included, glabrous, sometimes ciliate.
Stigmas

included, lobes unequal, abaxial 1.5 times adaxial.

included, lobes equal.
2n

= 16.

Diplacus layneae

Diplacus bigelovii
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. ((300–)1300–7900 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
from FNA
AZ; CA; NV; UT
[WildflowerSearch map]
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.

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

Varieties 2 (2 in the flora).

Diplacus bigelovii is distributed in southeastern California from southern Mono County south to Imperial and San Diego counties through southern Nevada into Washington County, Utah, and La Paz and Mohave counties, Arizona. The relatively sharp line dividing the two varieties roughly follows the Inyo-San Bernardino county line, then cuts across Clark County, Nevada, and Mojave County, Arizona.

Diplacus bigelovii can generally be recognized by its relatively large, nearly radially symmetric corollas, included stigmas, and inflated mature calyces with lobes of unequal length and apices acuminate-attenuate. The two varieties have distinctive leaf shapes; D. M. Thompson (2005) reported them as very closely parapatric and exhibiting limited intergradation near their contiguous occurrence.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaf blades: distals gradually narrower than proximals, apices long-tapering or long-acuminate; internodes: proximals usually longer than distals.
var. bigelovii
1. Leaf blades: distals usually relatively broader than proximals, apices abruptly acute-acuminate, sometimes cuspidate; internodes usually subequal.
var. cuspidatus
Source FNA vol. 17, p. 437. FNA vol. 17, p. 434.
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. johnstonii, D. kelloggii, 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. 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. 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
Subordinate taxa
D. bigelovii var. bigelovii, D. bigelovii var. cuspidatus
Synonyms Eunanus layneae, Mimulus brachiatus, M. layneae Eunanus bigelovii, Mimulus bigelovii
Name authority (Greene) G. L. Nesom: Phytoneuron 2012-39: 29. (2012) (A. Gray) G. L. Nesom: Phytoneuron 2012-39: 28. (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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