View source for Diplacus

{{Treatment/ID
|accepted_name=Diplacus
|accepted_authority=Nuttall
|publications={{Treatment/Publication
|title=Ann. Nat. Hist.
|place=1: 137. 1838
|year=1838
}}
|common_names=Sessile monkeyflower
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Eunanus
|authority=Bentham
}} {{Treatment/ID/Synonym
|name=Mimulus sect. Diplacus
|authority=(Nuttall) A. Gray
}}
|hierarchy=Phrymaceae;Diplacus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Phrymaceae]]</div><div class="higher-taxon"><small>genus</small>[[Diplacus]]</div></div>
|etymology=Greek dis-, two, and plakos, placenta, alluding to splitting of capsule into valves bearing parietal placentae
|volume=Volume 17
|mention_page=page 6, 365, 366, 367, 373, 425, 427, 438, 446
|treatment_page=page 426
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> subshrubs, or shrubs, annual or perennial, terrestrial. <b>Stems</b> erect, terete, rarely 4-sided (<i>D. pictus</i>), glabrous, puberulent, hirtellous, hirsutulous, glandular-puberulent, or glandular-pubescent to glandular-villous with gland-tipped hairs. <b>Leaves</b> basal and cauline, or basal deciduous by flowering; petiole absent or present; blade not fleshy, leathery or not, margins toothed to subentire or entire, plane or revolute, venation palmate to subpinnate. <b>Inflorescences</b> axillary, flowers usually at medial to distal nodes, 0 or 1(or 2) in each axil, thus 1 or 2(–4) flowers at each node; bracts absent or present. <b>Pedicels</b> nearly absent or shorter than calyces, rarely ± equal to or slightly longer than calyces; bracteoles absent. <b>Flowers</b> erect to lateral or nodding, not strongly reflexed and appressed in fruit; sepals 5, calyx symmetric, tubular, lobes triangular to deltate, rarely reduced or barely evident, midvein angled or wing-angled; petals 5, corolla marcescent (caducous in <i>D. mohavensis</i>, <i>D. pictus</i>), blue, pink, red, magenta, lavender, purple, purplish brown, orange, or yellow, rarely white, sometimes multicolor, bilaterally symmetric, rarely radially symmetric, weakly to strongly bilabiate or not, rarely ± rotate, funnelform, or salverform, abaxial lobes 3, adaxial 2; stamens 4, didynamous, filaments glabrous or hairy; staminode 0; ovary 2-locular, placentation parietal; stigma 2-lobed. <b>Fruits</b> capsules, ovoid or asymmetrically ovoid to lanceoloid or nearly cylindric, sometimes longitudinally compressed, apex attenuate, walls smooth, eglandular, dehiscence loculicidal along both sutures at least 1/2 to base, indehiscent (species 29–38), or tardily dehiscent (<i>D. pictus</i>). <b>Seeds</b> 100–2000, yellow to olive green or dark brown, ovoid to oblong, flattened, wings absent. <b>x</b> = 8, 9, 10.</span><!--

-->{{Treatment/Body
|distribution=w United States;nw Mexico.
|discussion=<p>Species 49 (48 in the flora).</p><!--
--><p><i>Diplacus</i> includes western North American species with parietal placentation and pedicels usually distinctly shorter than the calyces, which were formerly treated within <i>Mimulus</i> in the broad sense. The closest relatives of <i>Diplacus</i> apparently are <i>Mimetanthe</i> and the Mexican-Central American Hemichaena Bentham, which also are characterized by parietal placentation. <i>Diplacus</i> has been divided into six sections (W. R. Barker et al. 2012; G. L. Nesom 2013b), corresponding to morphological patterns and cladistic patterns in the molecular-based phylogenetic analysis by P. M. Beardsley et al. (2004). The species are ordered here following that system as follows: sect. Eunanus (Bentham) G. L. Nesom & N. S. Fraga (species 1–27, type <i>D. nanus</i>), sect. Pseudoenoe (A. L. Grant) G. L. Nesom & N. S. Fraga (species 28, type <i>D. pictus</i>), sect. Cleisanthus (J. T. Howell) G. L. Nesom & N. S. Fraga (species 29–33, type <i>D. douglasii</i>), sect. Oenoe (A. Gray) G. L. Nesom & N. S. Fraga (species 34–38, type <i>D. tricolor</i>), and sect. <i>Diplacus</i> (species 39–48, type <i>D. aurantiacus</i>).</p><!--
--><p>Evolutionary radiation in <i>Diplacus</i> has been restricted to the United States and Mexico, in contrast to <i>Erythranthe</i>, the other large segregate from <i>Mimulus</i>. The only species of <i>Diplacus</i> that does not occur in the United States is an endemic of Baja California on Cedros Island, D. stellatus Kellogg, a member of sect. <i>Diplacus</i> (M. C. Tulig and G. L. Nesom 2012). D. M. Thompson (2005) treated D. stellatus as a synonym of his broadly conceived <i>D. aurantiacus</i>.</p><!--
--><p>A revision of <i>Mimulus</i> in the broad sense was provided by A. L. Grant (1924), followed by a major update and overview by F. W. Pennell (1951) that covered the majority of the western North American species of <i>Diplacus</i>. The present treatment closely follows that of D. M. Thompson (2005); a major area of taxonomic difference is in sect. <i>Diplacus</i>, where he treated most of the variation as within two species (<i>D. aurantiacus</i> and <i>D. clevelandii</i>), recognizing a number of varieties within <i>D. aurantiacus</i> that are here treated at specific rank. The detailed revision of Thompson forms a substantial basis of the treatment here.</p><!--
--><p>Plants in sect. <i>Diplacus</i> are subshrubs or shrubs (except for the herbaceous <i>Diplacus clevelandii</i>) and are the only perennials (except for <i>D. rupicola</i>) in <i>Diplacus</i>. They also are distinctive in their glutinous, revolute-margined leaves, often with fascicles of smaller leaves in the axils of main shoots, and minutely glandular styles. Molecular data indicate that sect. <i>Diplacus</i> is derived from annual, herbaceous ancestors.</p>
|tables=
|references={{Treatment/Reference
|id=ezell1971a
|text=Ezell, W. L. 1971. Biosystematics of the Mimulus nanus Complex in Oregon. Ph.D. dissertation. Oregon State University.
}}{{Treatment/Reference
|id=mcminn1951a
|text=McMinn, H. 1951. Studies in the genus Diplacus, Scrophulariaceae. Madroño 11: 33–128.
}}{{Treatment/Reference
|id=michener1983a
|text=Michener, D. C. 1983. Systematic and ecological wood anatomy of Californian Scrophulariaceae. I. Antirrhinum, Castilleja, Galvezia, and Mimulus sect. Diplacus. Aliso 10: 471–487.
}}{{Treatment/Reference
|id=tulig2000a
|text=Tulig, M. C. 2000. Morphological Variation in Mimulus Section Diplacus (Scrophulariaceae). M.S. thesis. California State Polytechnic University.
}}{{Treatment/Reference
|id=tulig2012a
|text=Tulig, M. C. and G. L. Nesom. 2012. Taxonomic overview of Diplacus sect. Diplacus (Phrymaceae). Phytoneuron 2012-45: 1–17.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Subshrubs, shrubs, or herbs, perennial; leaf blade margins plane or revolute; calyces 17–40 mm.
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Herbs, rhizomatous; corollas bright golden yellow.
|[[Diplacus clevelandii|Diplacus clevelandii]]
|-id=key-0-2
|2
|Subshrubs or shrubs, not stoloniferous or rhizomatous; corollas red, maroon, scarlet, orange-red, orange, pale orange, dull orange, pale yellow-orange, cream, yellow, pale yellow, or nearly white, sometimes golden yellow (D. aridus).
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Corollas red, scarlet, orange-red, orange, or maroon.
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Calyces glandular-puberulent and short glandular-villous to hirsute-villous.
|[[Diplacus rutilus|Diplacus rutilus]]
|-id=key-0-4
|4
|Calyces glabrous.
|[[#key-0-5| > 5]]
|-id=key-0-5
|5
|Leaf blades linear-oblong or narrowly elliptic to narrowly lanceolate or oblanceolate, apices acute; corolla limbs 15–23 mm diam.
|[[Diplacus puniceus|Diplacus puniceus]]
|-id=key-0-5
|5
|Leaf blades elliptic to broadly elliptic-oblanceolate or elliptic-lanceolate, apices acute to obtuse or rounded; corolla limbs 12–16 mm diam.
|[[Diplacus parviflorus|Diplacus parviflorus]]
|-id=key-0-3
|3
|Corollas pale yellow, yellow, golden yellow, light orange, pale yellow-orange, orange, orange-yellow, dull orange, cream, or nearly white.
|[[#key-0-6| > 6]]
|-id=key-0-6
|6
|Abaxial leaf surfaces hairy.
|[[#key-0-7| > 7]]
|-id=key-0-7
|7
|Calyces glabrous or hirtellous and/or minutely stipitate-glandular; leaf blade surfaces glabrous or abaxial usually sparsely to densely hairy, hairs branched, adaxial usually without unbranched hairs.
|[[Diplacus aurantiacus|Diplacus aurantiacus]]
|-id=key-0-7
|7
|Calyces densely glandular-puberulent or glandular-pubescent to short glandular-villous or hirsute-villous; leaf blade abaxial surfaces moderately villous, hairs unbranched, vitreous or densely hairy, hairs branched, adaxial glabrous or glabrescent.
|[[#key-0-8| > 8]]
|-id=key-0-8
|8
|Corollas usually pale yellow or cream to yellow, limbs 20–30 mm diam.; calyces 28–40 mm; leaf blade abaxial surfaces moderately villous, hairs unbranched, vitreous.
|[[Diplacus calycinus|Diplacus calycinus]]
|-id=key-0-8
|8
|Corollas light orange to pale yellow-orange, limbs (25–)28–40 mm diam.; calyces 22–32 mm; leaf blade abaxial surfaces densely hairy, hairs branched.
|[[Diplacus longiflorus|Diplacus longiflorus]]
|-id=key-0-6
|6
|Abaxial leaf surfaces glabrous.
|[[#key-0-9| > 9]]
|-id=key-0-9
|9
|Corolla lobes entire; calyces 35–40 mm, tubes distinctly dilated distally; stems 80–330 mm.
|[[Diplacus aridus|Diplacus aridus]]
|-id=key-0-9
|9
|Corolla lobes apically incised 1/4–1/2 length, appearing 2-lobed; calyces 20–30 mm, tubes slightly dilated distally; stems 300–800(–1200) mm.
|[[#key-0-10| > 10]]
|-id=key-0-10
|10
|Leaf blades elliptic or oblong-elliptic to elliptic-lanceolate or elliptic-oblanceolate, 4–17 mm wide; corolla limbs 30–45 mm diam.; c Sierra Nevada.
|[[Diplacus grandiflorus|Diplacus grandiflorus]]
|-id=key-0-10
|10
|Leaf blades narrowly elliptic to narrowly lanceolate or narrowly elliptic-oblong, 3–9 mm wide; corolla limbs 20–25 mm diam.; coastal counties.
|[[Diplacus linearis|Diplacus linearis]]
|-id=key-0-1
|1
|Herbs, annual, rarely perennial (D. rupicola); leaf blade margins plane; calyces usually 2–18 mm, (6–)9–25(–31) mm in D. bolanderi, D. brevipes, D. traskiae, and D. tricolor.
|[[#key-0-11| > 11]]
|-id=key-0-11
|11
|Herbs, perennial; calyx lobes unequal; corolla limbs pinkish white to nearly white.
|[[Diplacus rupicola|Diplacus rupicola]]
|-id=key-0-11
|11
|Herbs, annual; calyx lobes subequal or unequal; corolla limbs not pinkish white to nearly white.
|[[#key-0-12| > 12]]
|-id=key-0-12
|12
|Corollas salverform-rotate, throats dark purplish brown without internal or external markings, palate ridges absent.
|[[#key-0-13| > 13]]
|-id=key-0-13
|13
|Corolla lobes purplish brown basally with red veins; leaf blades narrowly elliptic to elliptic-lanceolate, margins entire; stems terete; stigma lobes subequal.
|[[Diplacus mohavensis|Diplacus mohavensis]]
|-id=key-0-13
|13
|Corolla lobes white with purplish brown veins; leaf blades elliptic to elliptic-ovate or obovate, margins crenate; stems 4-sided; stigma lobes unequal.
|[[Diplacus pictus|Diplacus pictus]]
|-id=key-0-12
|12
|Corollas bilabiate, sometimes not, throats whitish, yellow, pink, magenta, red, or purple, palate ridges present, sometimes absent (D. congdonii).
|[[#key-0-14| > 14]]
|-id=key-0-14
|14
|Corollas yellow or predominantly yellow, sometimes with red, reddish, reddish brown, maroon, or purple spots or lines.
|[[#key-0-15| > 15]]
|-id=key-0-15
|15
|Calyces (7–)10–25(–31) mm; corolla tube-throats (10–)15–30(–34) mm; leaves 7–90(–125) mm.
|[[Diplacus brevipes|Diplacus brevipes]]
|-id=key-0-15
|15
|Calyces (3–)5–14 mm; corolla tube-throats 5–23 mm; leaves 2–30(–55) mm.
|[[#key-0-16| > 16]]
|-id=key-0-16
|16
|Stems 5–15(–20) mm; leaf blade margins usually ciliate along proximal 1/2; corolla tube-throats 5–10 mm.
|[[Diplacus pygmaeus|Diplacus pygmaeus]]
|-id=key-0-16
|16
|Stems 10–200(–240) mm; leaf blade margins not ciliate; corolla tube-throats (8–)10–23 mm.
|[[#key-0-17| > 17]]
|-id=key-0-17
|17
|Flowers 1 per node.
|[[Diplacus vandenbergensis|Diplacus vandenbergensis]]
|-id=key-0-17
|17
|Flowers 2 per node, or 1 or 2 per node on 1 plant.
|[[#key-0-18| > 18]]
|-id=key-0-18
|18
|Stigmas exserted or at opening of corolla tube-throat.
|[[Diplacus mephiticus|Diplacus mephiticus]]
|-id=key-0-18
|18
|Stigmas included.
|[[#key-0-19| > 19]]
|-id=key-0-19
|19
|Calyx lobes subequal; corolla throats with dark maroon stripes; s Sierra Nevada, (1200–)1500–3300 m.
|[[Diplacus bicolor|Diplacus bicolor]]
|-id=key-0-19
|19
|Calyx lobes unequal; corolla throats usually with 6–8 narrow reddish spots or lines in arc on abaxial lip around mouth and throat floor with reddish spots, colored palate ridges; Mohave Desert, (600–)800–1700(–1800) m.
|[[Diplacus parryi|Diplacus parryi]]
|-id=key-0-14
|14
|Corollas shades of red to purple, sometimes white or magenta with yellow abaxial lobes or palate.
|[[#key-0-20| > 20]]
|-id=key-0-20
|20
|Corolla lips: abaxial essentially absent or smaller than adaxial; calyces distinctly asymmetrically attached to pedicels.
|[[#key-0-21| > 21]]
|-id=key-0-21
|21
|Corolla lips: abaxial absent or nearly absent.
|[[Diplacus douglasii|Diplacus douglasii]]
|-id=key-0-21
|21
|Corolla lips: abaxial present, usually smaller than adaxial.
|[[#key-0-22| > 22]]
|-id=key-0-22
|22
|Calyces 18–21 mm; Santa Catalina Island.
|[[Diplacus traskiae|Diplacus traskiae]]
|-id=key-0-22
|22
|Calyces 5–16(–17) mm; Santa Catalina and Santa Cruz islands (D. brandegeei) or mainland.
|[[#key-0-23| > 23]]
|-id=key-0-23
|23
|Palate ridges absent or purple; corolla throats not golden yellow at base.
|[[Diplacus congdonii|Diplacus congdonii]]
|-id=key-0-23
|23
|Palate ridges golden yellow; corolla throats golden yellow at base.
|[[#key-0-24| > 24]]
|-id=key-0-24
|24
|Corolla limbs 10–18 mm diam.; pedicels usually twisting, inverting calyx in fruit; leaf margins not ciliate; California (mainland) and Oregon.
|[[Diplacus kelloggii|Diplacus kelloggii]]
|-id=key-0-24
|24
|Corolla limbs 5–11 mm diam.; pedicels not twisting, inverting calyx in fruit; leaf margins usually ciliate in proximal 1/2; California (Santa Catalina and Santa Cruz islands).
|[[Diplacus brandegeei|Diplacus brandegeei]]
|-id=key-0-20
|20
|Corolla lips: abaxial and adaxial of ± equal size; calyces symmetrically, sometimes slightly asymmetrically, attached to pedicels.
|[[#key-0-25| > 25]]
|-id=key-0-25
|25
|Plants acaulescent or short-caulescent; stems 30–70 mm; basal leaves densely clustered; corolla tube-throats 15–60 mm.
|[[#key-0-26| > 26]]
|-id=key-0-26
|26
|Corollas not bicolored or tricolored (throat and limb usually magenta to purple with a dark maroon-purple spot or elongate blotch at base of each abaxial lobe, palate ridges and bases of abaxial lips yellow).
|[[Diplacus angustatus|Diplacus angustatus]]
|-id=key-0-26
|26
|Corollas bicolored or tricolored.
|[[#key-0-27| > 27]]
|-id=key-0-27
|27
|Corollas bicolored.
|[[Diplacus pulchellus|Diplacus pulchellus]]
|-id=key-0-27
|27
|Corollas tricolored.
|[[Diplacus tricolor|Diplacus tricolor]]
|-id=key-0-25
|25
|Plants caulescent; stems 10–900(–1200) mm; basal leaves seldom densely clustered; corolla tube-throats 6–30 mm.
|[[#key-0-28| > 28]]
|-id=key-0-28
|28
|Leaf blade apices (at least distal leaves) abruptly acuminate or cuspidate to long-tapering or long-acuminate.
|[[#key-0-29| > 29]]
|-id=key-0-29
|29
|Corollas not bilabiate; calyces inflated in fruit, lobes strongly unequal.
|[[Diplacus bigelovii|Diplacus bigelovii]]
|-id=key-0-29
|29
|Corollas bilabiate; calyces not inflated in fruit, lobes subequal or slightly unequal.
|[[#key-0-30| > 30]]
|-id=key-0-30
|30
|Leaf surfaces glabrous or sparsely glandular-puberulent, or adaxial minutely stipitate-glandular.
|[[#key-0-31| > 31]]
|-id=key-0-31
|31
|Corolla tube-throats 13–16(–19) mm, limbs 16–24 mm diam.; leaves (10–)15–25(–35) mm; Malheur County, Oregon, and Ada and Owyhee counties, Idaho.
|[[Diplacus cusickii|Diplacus cusickii]]
|-id=key-0-31
|31
|Corolla tube-throats 8–12 mm, limbs 10–16 mm diam.; leaves 10–15(–25) mm; Crook, Deschutes, Jefferson, Klamath, Lake, and Wheeler counties, Oregon.
|[[Diplacus deschutesensis|Diplacus deschutesensis]]
|-id=key-0-30
|30
|Leaf surfaces densely glandular-villous.
|[[#key-0-32| > 32]]
|-id=key-0-32
|32
|Stems (10–)30–240(–350) mm, usually simple or few-branched; calyces 7–12 mm; corolla tube-throats 13–16(–19) mm, limbs 14–26 mm diam.; capsules 10–17 mm; California, Idaho, Oregon, Washington.
|[[Diplacus cusickioides|Diplacus cusickioides]]
|-id=key-0-32
|32
|Stems 20–140 mm, usually many-branched; calyces 7–9(–10) mm; corolla tube-throats 9–11 mm, limbs 12–15 mm diam.; capsules 6–8 mm; Nevada.
|[[Diplacus ovatus|Diplacus ovatus]]
|-id=key-0-28
|28
|Leaf blade apices rounded, rounded-acute, obtuse, or acute.
|[[#key-0-33| > 33]]
|-id=key-0-33
|33
|Capsules indehiscent; corolla lobes each with discrete, dark spot at base; flowers 1 per node.
|[[Diplacus tricolor|Diplacus tricolor]]
|-id=key-0-33
|33
|Capsules dehiscent; corolla lobes not each with discrete, dark spot at base; flowers 1, 2, or 1 or 2 per node on 1 plant.
|[[#key-0-34| > 34]]
|-id=key-0-34
|34
|Flowers 1 per node.
|[[#key-0-35| > 35]]
|-id=key-0-35
|35
|Corolla tube-throats 7–10 mm, limbs 4–7 mm diam.
|[[Diplacus rattanii|Diplacus rattanii]]
|-id=key-0-35
|35
|Corolla tube-throats 9–23 mm, limbs 8–26 mm diam.
|[[#key-0-36| > 36]]
|-id=key-0-36
|36
|Corollas: palate ridges yellow, throat floor glabrous or puberulent at mouth.
|[[Diplacus fremontii|Diplacus fremontii]]
|-id=key-0-36
|36
|Corollas: palate ridges white or yellow fading distally to white, throat villous at mouth.
|[[#key-0-37| > 37]]
|-id=key-0-37
|37
|Corolla lobes with dark red-purple midveins extending from throat, lobes not each with dark spot at base, throat ceilings glabrous; styles glandular-puberulent; abaxial stigma lobes 1.5 times adaxials.
|[[Diplacus viscidus|Diplacus viscidus]]
|-id=key-0-37
|37
|Corolla lobes without dark midveins, lobes dark at base, throat ceilings villous-pilose; styles glabrous or sparsely eglandular-puberulent; abaxial stigma lobes 3–4 times adaxials.
|[[Diplacus compactus|Diplacus compactus]]
|-id=key-0-34
|34
|Flowers 2 per node, or 1 or 2 per node on 1 plant.
|[[#key-0-38| > 38]]
|-id=key-0-38
|38
|Stigmas exserted or at opening of corolla tube-throats.
|[[#key-0-39| > 39]]
|-id=key-0-39
|39
|Corolla limbs not bilabiate; anthers glabrous.
|[[#key-0-40| > 40]]
|-id=key-0-40
|40
|Corollas: palate ridges and throat floors yellow, throats usually with large dark spot on each side of mouth on lateral walls; stigma lobes equal; calyces not inflated in fruit, ribs inconspicuous.
|[[Diplacus johnstonii|Diplacus johnstonii]]
|-id=key-0-40
|40
|Corollas: palate ridges or throat floors white, throats without dark spots; stigma lobes unequal, abaxials 2–3 times adaxials; calyces inflated in fruit, ribs prominent.
|[[Diplacus bolanderi|Diplacus bolanderi]]
|-id=key-0-39
|39
|Corolla limbs bilabiate, rarely not; anthers hairy.
|[[#key-0-41| > 41]]
|-id=key-0-41
|41
|Leaf blade margins crenate to serrulate, at least on biggest leaves; pedicels 2–7(–10) mm in fruit.
|[[Diplacus clivicola|Diplacus clivicola]]
|-id=key-0-41
|41
|Leaf blade margins entire; pedicels 1–3 mm in fruit.
|[[#key-0-42| > 42]]
|-id=key-0-42
|42
|Corolla limbs 5–7 mm diam., tube-throats 7–10 mm, tubes 0.8–1.2 mm diam. at filament insertion; capsules 4–6 mm.
|[[Diplacus jepsonii|Diplacus jepsonii]]
|-id=key-0-42
|42
|Corolla limbs (5–)7–14(–15) mm diam., tube-throats 8–14(–15) mm, tubes 1.1–1.9 mm diam. at filament insertion; capsules 5–12 mm.
|[[#key-0-43| > 43]]
|-id=key-0-43
|43
|Leaf surfaces glandular-pubescent and (at least along veins) viscid-villous.
|[[Diplacus mephiticus|Diplacus mephiticus]]
|-id=key-0-43
|43
|Leaf surfaces minutely glandular-puberulent.
|[[#key-0-44| > 44]]
|-id=key-0-44
|44
|Distal leaves: blades oblanceolate to elliptic-lanceolate, 2–4 mm wide; corolla tube-throats 11–15 mm, throat floors villous with hairs extending onto adaxial lip; capsules 8–12 mm.
|[[Diplacus nanus|Diplacus nanus]]
|-id=key-0-44
|44
|Distal leaves: blades obovate to broadly oblanceolate, 5–8(–12) mm wide; corolla tube-throats 8–10 mm, throat floors glabrous; capsules 5–8(–9) mm.
|[[Diplacus cascadensis|Diplacus cascadensis]]
|-id=key-0-38
|38
|Stigmas included.
|[[#key-0-45| > 45]]
|-id=key-0-45
|45
|Stems glandular-puberulent; calyx lobes unequal, adaxial longer.
|[[Diplacus parryi|Diplacus parryi]]
|-id=key-0-45
|45
|Stems glandular-puberulent to glandular-pubescent or glandular-villous, sometimes glabrous or glabrate proximally; calyx lobes subequal.
|[[#key-0-46| > 46]]
|-id=key-0-46
|46
|Corolla tube-throats 6–8 mm, limbs 3–5 mm diam.
|[[Diplacus leptaleus|Diplacus leptaleus]]
|-id=key-0-46
|46
|Corolla tube-throats (8–)9–22(–25) mm, limbs 6–24 mm diam.
|[[#key-0-47| > 47]]
|-id=key-0-47
|47
|Calyx lobes shallowly triangular to broadly ovate; herbage not drying dark.
|[[Diplacus torreyi|Diplacus torreyi]]
|-id=key-0-47
|47
|Calyx lobes triangular or narrowly triangular; herbage usually drying dark.
|[[#key-0-48| > 48]]
|-id=key-0-48
|48
|Calyx tubes not strongly plicate, ribs thin, not strongly raised.
|[[Diplacus bicolor|Diplacus bicolor]]
|-id=key-0-48
|48
|Calyx tubes strongly plicate, ribs thickened, strongly raised.
|[[#key-0-49| > 49]]
|-id=key-0-49
|49
|Nodes 4–15(–20); calyx ribs narrow, intercostal areas green to purple, not membranous.
|[[Diplacus graniticola|Diplacus graniticola]]
|-id=key-0-49
|49
|Nodes 3–6; calyx ribs broad, intercostal areas whitish, membranous.
|[[#key-0-50| > 50]]
|-id=key-0-50
|50
|Calyces not inflated in fruit; abaxial stigma lobes 1.5 times adaxial.
|[[Diplacus layneae|Diplacus layneae]]
|-id=key-0-50
|50
|Calyces inflated in fruit; stigma lobes equal to subequal.
|[[#key-0-51| > 51]]
|-id=key-0-51
|51
|Leaf apices abruptly acuminate, acute-acuminate, or cuspidate to long-tapering or long-acuminate.
|[[Diplacus bigelovii|Diplacus bigelovii]]
|-id=key-0-51
|51
|Leaf apices acute or rounded.
|[[#key-0-52| > 52]]
|-id=key-0-52
|52
|Stems and leaves glandular-puberulent; corolla tube-throats 10–14 mm, limbs 6–10 mm diam.; palate ridges yellow.
|[[Diplacus thompsonii|Diplacus thompsonii]]
|-id=key-0-52
|52
|Stems glandular-villous; corolla tube-throats (10–)13–22(–25) mm, limbs 14–23 mm diam.; palate ridges white.
|[[Diplacus constrictus|Diplacus constrictus]]
|}
</div></div><!--

-->{{#Taxon:
name=Diplacus
|author=Guy L. Nesom; Melissa C. Tulig
|authority=Nuttall
|rank=genus
|parent rank=family
|synonyms=Eunanus;Mimulus sect. Diplacus
|basionyms=
|family=Phrymaceae
|distribution=w United States;nw Mexico.
|reference=ezell1971a;mcminn1951a;michener1983a;tulig2000a;tulig2012a
|publication title=Ann. Nat. Hist.
|publication year=1838
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V17/V17_1361.xml
|genus=Diplacus
}}<!--

-->[[Category:Treatment]][[Category:Phrymaceae]]