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Layne's monkeyflower

island bush monkeyflower

Habit Herbs, annual, herbage usually drying dark. Subshrubs or shrubs.
Stems

erect, 30–160(–300) mm, nodes 3–6, glandular-puberulent to glandular-pubescent, hairs 0.2–0.8 mm.

erect to ascending-erect, 300–1200 mm, glabrous.

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.

cauline, relatively even-sized;

petiole absent;

blade elliptic to broadly elliptic-oblanceolate or elliptic-lanceolate, 15–60 × 4–21 mm, margins entire or serrate, plane or revolute, apex acute to obtuse or rounded, surfaces glabrous.

Pedicels

2–4(–5) mm in fruit.

6–15 mm in fruit.

Flowers

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

2 per node, chasmogamous.

Styles

glandular-puberulent.

minutely glandular.

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.

deep red to scarlet, throat sometimes orange, not spotted or striped, palate ridges red to orange-red, tube-throat 27–33 mm, limb 12–16 mm diam., bilabiate, lobes oblong, each truncate-entire to slightly emarginate.

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.

not inflated in fruit, 18–25 mm, glabrous, tube slightly dilated distally, lobes unequal, apex acute, ribs green, intercostal areas light green.

Capsules

6–10(–13) mm.

14–21 mm.

Anthers

included, ciliate.

exserted, glabrous.

Stigmas

included, lobes unequal, abaxial 1.5 times adaxial.

exserted, lobes equal.

2n

= 16.

= 20.

Diplacus layneae

Diplacus parviflorus

Phenology Flowering May–Aug. Flowering Mar–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. Hillsides, canyons, rocky slopes and walls, bluffs, sea cliffs.
Elevation (100–)400–2400 m. ((300–)1300–7900 ft.) 10–400 m. (0–1300 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
from FNA
CA
[WildflowerSearch map]
[BONAP county 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.)

Diplacus parviflorus is known from four of the Channel Islands (Anacapa, San Clemente, Santa Cruz, and Santa Rosa).

Hybrids with Diplacus longiflorus occur on Santa Cruz Island; A. L. Grant (according to label data of collections) found these to be fairly common on open hillsides near Friar’s Harbor and Valdez, where the two species grew near each other though apparently separated in habitat, with typical D. parviflorus mostly in the canyons and D. longiflorus on open hillsides. She noted that the apparent hybrids were variable in all possible combinations of features of the leaves, calyces, and corollas, including color.

Mimulus parviflorus (Greene) A. L. Grant 1925, not Lindley 1825, pertains here.

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

Source FNA vol. 17, p. 437. FNA vol. 17, p. 452.
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. 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. mohavensis, D. nanus, D. ovatus, D. parryi, 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 Eunanus layneae, Mimulus brachiatus, M. layneae Mimulus aurantiacus var. parviflorus, M. flemingii
Name authority (Greene) G. L. Nesom: Phytoneuron 2012-39: 29. (2012) Greene: Pittonia 1: 36. (1887)
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