Flora of North America species comparison

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Diplacus viscidus

Diplacus rutilus

sticky monkeyflower, viscid monkeyflower

Santa Susana bush monkeyflower
Habit Herbs, annual. Subshrubs.
Stems

erect, (30–)60–370 mm, densely glandular-pubescent with viscid hairs.

erect, 300–1000(–2000) mm, glandular-puberulent and short-villous.
Leaves

usually cauline, relatively even-sized or largest proximally and gradually reduced distally;

petiole absent;

blade obovate to narrowly elliptic, (4–)8–54(–70) × (2–)3–23 mm, margins entire or serrate, plane, apex obtuse to rounded, surfaces: proximals glabrous abaxially, distals glandular-pubescent.

usually cauline, relatively even-sized;

petiole absent;

blade elliptic to lanceolate, elliptic-lanceolate, or elliptic-oblanceolate, 25–65(–80) × 4–15(–25) mm, margins entire or serrate, revolute, apex acute to obtuse, abaxial surfaces densely hairy, hairs branched, adaxial glabrescent.
Pedicels

1–4(–5) mm in fruit.

5–16 mm in fruit.
Flowers

1 per node, chasmogamous.

2 per node, chasmogamous.
Styles

glandular-puberulent.

minutely glandular.
Corollas

lavender to magenta with diffuse dark markings on sides of darker tube-throat and with dark red-purple midveins on lobes extending from throat, lobes not dark at base, floor white or yellow, fading to white at mouth, palate ridges white or yellow fading to white distally, throat ceiling glabrous, tube-throat 10–20 mm, limb 8–20 mm diam., not bilabiate.

red to orange-red, throat whitish at least on floor, palate ridges orange or white with orange crest, tube-throat 34–45 mm, limb (25–)28–40 mm diam., bilabiate, lobes oblong, apex of adaxial 2 each shallowly, asymmetrically incised.
Calyces

symmetrically attached to pedicels, inflated in fruit, (7–)8–15 mm, villous, hairs eglandular, lobes subequal, apex acute to attenuate, ribs and intercostal areas often reddish.

not inflated in fruit, 22–32 mm, glandular-puberulent and short glandular-villous to hirsute-villous, tube slightly dilated distally, lobes unequal, apex acute, ribs green, intercostal areas light green.
Capsules

7–11 mm.

18–28 mm.
Anthers

included, ciliate.

included, glabrous.
Stigmas

included, lobes unequal, abaxial 1.5 times adaxial.

included, lobes equal.
2n

= 16.

Diplacus viscidus

Diplacus rutilus
Phenology Flowering Apr–Jul. Flowering Mar–Jun.
Habitat Chaparral clearings and openings. Chaparral.
Elevation 90–1300 m. (300–4300 ft.) 400–600 m. (1300–2000 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

D. M. Thompson (2005) noted that Diplacus viscidus and D. compactus (as Mimulus viscidus var. compactus) are parapatric and may intergrade in central Mariposa County. The two taxa are distinguished by the presence or absence of dark stripes on the corolla lobe midveins, which are evident even on herbarium specimens. Thompson found that the two remained distinct when grown together in the greenhouse.

Diplacus viscidus is known from Amador, Calaveras, Eldorado, Mariposa, Merced, and Tuolumne counties; D. compactus continues south through Fresno, northern Kern, Madera, Mariposa, and Tulare counties.

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

H. E. McMinn (1951), M. C. Tulig and G. L Nesom (2012), and Nesom (2013c) treated Diplacus rutilus at specific rank, but P. A. Munz and D. D. Keck (1973) followed the original assessment of A. L. Grant (1924) in treating it as a variety of the light orange- to pale yellow-orange-flowered D. longiflorus, while R. M. Beeks (1962) and D. M. Thompson (2005) regarded this taxon as only a variant of D. longiflorus, without formal rank. It is maintained here as a distinct, red-flowered species localized in Los Angeles County, California. Diplacus rutilus occurs in pockets in a strip from Whittier and Pomona through North Pasadena westward to near the Ventura County line (the Santa Susana area being the type locality), a distance of almost 60 miles.

Very few of these red-flowered collections can be separated in any feature except corolla color from typical Diplacus longiflorus. Red corollas have not been observed in D. longiflorus outside of Los Angeles County, and D. rutilus might be interpreted as reflecting local introgression in this area from D. puniceus, but the distinctive and tightly coherent geographical distribution of these red-flowered plants and their apparent absence elsewhere in the area where D. ×australis occurs suggest that the origin of D. rutilus is different from that of the highly variable D. ×australis.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 432. FNA vol. 17, p. 451.
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. 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. 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. parviflorus, D. pictus, D. pulchellus, D. puniceus, D. pygmaeus, D. rattanii, D. rupicola, D. thompsonii, D. torreyi, D. traskiae, D. tricolor, D. vandenbergensis, D. viscidus
Synonyms Mimulus viscidus, M. fremontii var. viscidus, M. subsecundus var. viscidus Mimulus longiflorus var. rutilus, D. longiflorus var. rutilus
Name authority (Congdon) G. L. Nesom: Phytoneuron 2012-39: 29. (2012) (A. L. Grant) McMinn: Madroño 11: 83. (1951)
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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