Flora of North America species comparison

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Diplacus graniticola

Diplacus rutilus

granite-crack monkeyflower

Santa Susana bush monkeyflower
Habit Herbs, annual, herbage usually drying dark. Subshrubs.
Stems

erect, 60–120(–150) mm, nodes 4–15(–20), internodes shorter than leaves, glandular-villous with gland-tipped hairs 1–1.6 mm.

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

usually cauline, relatively even-sized;

petiole weakly delimited;

blade usually lanceolate to ovate-lanceolate, 20–40 × 4–12 mm, margins entire, rarely toothed, plane, apex rounded to obtuse or acute, surfaces: proximals often glabrate abaxially, distals glandular-villous.

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

1–3 mm in fruit.

5–16 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

nearly white or pale lavender to pinkish or pale to dark magenta, each lobe with a dark medial line extending nearly to tip, throat with a dark red or purple splotch at junction of each abaxial lobe and adjacent lateral lobe, throat floor sometimes with 2 adjacent white splotches at lateral lobe bases, palate ridges yellow, tube-throat 15–20 mm, limb 10–16 mm diam., 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, not inflated in fruit, 8–12 mm, glandular-villous, tube strongly plicate, lobes triangular, subequal, apex acute, ribs narrow, darkened, blackish, thickened, strongly raised, intercostal areas green to purple, not membranous.

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

6–10 mm.

18–28 mm.
Anthers

included, ciliate.

included, glabrous.
Stigmas

included, lobes unequal, abaxial 1.5 times adaxial.

included, lobes equal.
2n

= 16.

Diplacus graniticola

Diplacus rutilus
Phenology Flowering Apr–Sep. Flowering Mar–Jun.
Habitat Granite cracks and crevices. Chaparral.
Elevation 300–2100 m. (1000–6900 ft.) 400–600 m. (1300–2000 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
from FNA
CA
[BONAP county map]
Discussion

Diplacus graniticola occurs in the Sierra Nevada from Tuolumne County to northern Tulare County. These plants previously were identified within D. layneae, with which they are partially sympatric; where these two occur together, D. layneae often grows in granite-derived sand and gravel immediately adjacent to the granite rock habitat of D. graniticola.

(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. 438. 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. 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
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 longiflorus var. rutilus, D. longiflorus var. rutilus
Name authority Schoenig: Phytoneuron 2017-24: 1, figs. 1, 3–10. (2017) (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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