Jepson eFlora: Taxon page
Vascular Plants of California
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Diplacus aurantiacus

Higher Taxonomy
Family: PhrymaceaeView DescriptionDichotomous Key
Habit: Annual to shrub. Stem: ×-section generally round. Leaf: opposite, simple, generally entire or toothed; stipules 0. Inflorescence: spike, raceme, or panicle, bracted, or flowers 1--2 in axils. Flower: bisexual; calyx radial or +- bilateral, tube long, generally ribbed, lobes 5; corolla generally bilateral, generally 2-lipped, upper [1]2-lobed, lower 3-lobed; stamens 4 in 2 pairs, epipetalous, included or exserted; pistil 1, ovary superior, chambers 1--2, placentas parietal or axile, style 1, stigma lobes 2, flat, folding together when touched. Fruit: generally capsule, generally ellipsoid, loculicidal [indehiscent, 1-seeded].
Genera In Family: +- 12 genera, 200 species: +- worldwide, many habitats; some cultivated as ornamental (e.g., Diplacus, Erythranthe). Formerly included in Scrophulariaceae. Note: Family description by David J. Keil.
eFlora Treatment Author: Naomi S. Fraga [TJM2 author David M. Thompson]
Scientific Editor: Bruce G. Baldwin.
Genus: DiplacusView DescriptionDichotomous Key

Habit: Annual to shrub, glabrous to hairy. Stem: generally erect. Leaf: generally +- sessile, generally toothed or entire. Inflorescence: raceme, bracted, flowers 1--4 per node. Flower: pedicel generally < calyx; occasionally cleistogamous; calyx generally green, lobes 5, generally << tube, generally unequal; corolla semi-persistent, shriveling on the developing capsule (deciduous, in D. mohavensis and D. pictus), white to red, maroon, purple, orange, or yellow, tube-throat floor generally with 2 longitudinal folds; anther sacs spreading; placentas 2, parietal; stigma lobes generally included. Fruit: generally ovoid to lanceolate in outline or nearly cylindric, dehiscent to near base along the upper suture, and at least in distal half along lower suture, or sometimes indehiscent, chambers 2. Seed: many, generally < 1 mm, ovoid, +- yellow to dark brown.
Etymology: (Greek: two cake, from the separated placentas in fruit at dehiscence) Note: Limb width measured between most distant points across corolla face.
eFlora Treatment Author: Naomi S. Fraga [TJM2 author David M. Thompson]
Reference: [Thompson 2005 Syst Bot Monogr 75:1--213; Barker et al. 2012 Phytoneuron 39:1--60]
Diplacus aurantiacus (Curtis) Jeps.
Habit: Subshrub, shrub, glabrous. Leaf: narrowly elliptic to linear, entire to serrate, edges generally rolled under; abaxial surface pale, puberulent to densely hairy, at least some hairs branched to stellate. Inflorescence: flower 2--4 per node. Flower: pedicel 5--27 mm; calyx 18--36 mm, tube glabrous, distally appressed to corolla tube; corolla +- yellow-orange to orange (cream), tube-throat 25--30 mm, lobes shallowly and asymmetrically 2-lobed distally; anthers included. Fruit: 18--31 mm, splitting at upper suture. Chromosomes: 2n=20.
Ecology: Disturbed areas, coastal cliffs, canyon sides; Elevation: < 800 m. Bioregional Distribution: NW, CW, n&c SNF. Flowering Time: Mar--Jun Note: Hybridizes with Diplacus longiflorus. Diplacus ×lompocensis McMinn occurs where the ranges of Diplacus aurantiacus and Diplacus longiflorus meet in Santa Barbara and San Luis Obispo counties.
Synonyms: Mimulus aurantiacus Curtis; Mimulus glutinosus J.C. Wendl.
Jepson eFlora Author: Naomi S. Fraga [TJM2 author David M. Thompson]
Reference: [Thompson 2005 Syst Bot Monogr 75:1--213; Barker et al. 2012 Phytoneuron 39:1--60]
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Jepson Video for Diplacus aurantiacus

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Botanical illustration including Diplacus aurantiacus

botanical illustration including Diplacus aurantiacus

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Citation for this treatment: Naomi S. Fraga 2018, Diplacus aurantiacus, in Jepson Flora Project (eds.) Jepson eFlora, Revision 6,, accessed on April 16, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on April 16, 2024.

Mimulus aurantiacus
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©2001 Steve Schoenig
Mimulus aurantiacus
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©2009 Thomas Stoughton
Mimulus aurantiacus  
var. pubescens
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©2016 Neal Kramer
Mimulus aurantiacus  
var. grandiflorus
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©2005 George W. Hartwell
Mimulus aurantiacus
click for enlargement
©2001 Steve Schoenig

More photos of Diplacus aurantiacus
in CalPhotos

Geographic subdivisions for Diplacus aurantiacus:
NW, CW, n&c SNF.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).