Diplacus is a genus of flowering plants in the family Phrymaceae, which was traditionally placed in family Scrophulariaceae. It includes 49 species native to the western United States and northwestern Mexico. Most prefer dry and rocky areas.
The genus Diplacus was first described by Thomas Nuttall in 1838. It was merged into Mimulus no later than 1905, until the 2012 restructuring. The 2012 restructuring of Mimulus by Barker, et al., based largely upon DNA evidence, left seven species in Mimulus, placed 111 into Erythranthe (species with axile placentation and long pedicels), placed 46 into Diplacus (species with parietal placentation and sessile flowers), placed two in Uvedalia, and placed one each in Elacholoma, Mimetanthe, and Thyridia.
Species 49 species are accepted.Diplacus Nutt. Plants of the World Online. Retrieved 16 August 2026. Diplacus angustatus (A.Gray) G.L.Nesom Diplacus aridus Abrams Diplacus aurantiacus (Curtis) Jeps. – sticky monkeyflower Diplacus × australis (McMinn ex Munz) Tulig (D. longiflorus × D. puniceus) Diplacus bicolor (synonym Diplacus whitneyi (A.Gray) G.L.Nesom) Diplacus bigelovii (A.Gray) G.L.Nesom Diplacus bolanderi (A.Gray) G.L.Nesom Diplacus brandegeei (Pennell) G.L.Nesom Diplacus brevipes (Benth.) G.L.Nesom Diplacus calycinus Eastw. Diplacus cascadensis Diplacus clevelandii (Brandegee) Greene Diplacus clivicola (Greenm.) G.L.Nesom Diplacus compactus (D.M.Thomps.) G.L.Nesom Diplacus congdonii (B.L.Rob.) G.L.Nesom Diplacus constrictus (A.L.Grant) G.L.Nesom Diplacus cusickii (Greene) G.L.Nesom Diplacus cusickioides Diplacus deschutesensis Diplacus douglasii (Benth.) G.L.Nesom Diplacus fremontii (Benth.) G.L.Nesom Diplacus grandiflorus (Lindl. & Paxton) Hérincq Diplacus graniticola Diplacus jepsonii (A.L.Grant) G.L.Nesom Diplacus johnstonii (A.L.Grant) G.L.Nesom Diplacus kelloggii (Curran ex Greene) G.L.Nesom Diplacus layneae (Greene) G.L.Nesom Diplacus leptaleus (A.Gray) G.L.Nesom Diplacus linearis (Benth.) Greene Diplacus × lompocensis McMinn (D. aurantiacus × D. longiflorus) Diplacus longiflorus Nutt. Diplacus mephiticus (Greene) G.L.Nesom Diplacus mohavensis (Lemmon) G.L.Nesom Diplacus nanus (Hook. & Arn.) G.L.Nesom Diplacus ovatus (A.Gray) G.L.Nesom Diplacus parryi (A.Gray) G.L.Nesom & N.S.Fraga Diplacus parviflorus Greene Diplacus pictus (Curran ex Greene) G.L.Nesom Diplacus pulchellus (Drew ex Greene) G.L.Nesom Diplacus puniceus Nutt. Diplacus pygmaeus (A.L.Grant) G.L.Nesom Diplacus rattanii (A.Gray) G.L.Nesom Diplacus rupicola (Coville & A.L.Grant) G.L.Nesom & N.S.Fraga Diplacus rutilus (A.L.Grant) McMinn Diplacus stellatus Kellogg Diplacus thompsonii Diplacus torreyi (A.Gray) G.L.Nesom Diplacus traskiae (A.L.Grant) G.L.Nesom Diplacus tricolor (Hartw. ex Lindl.) G.L.Nesom Diplacus vandenbergensis (D.M.Thomps.) G.L.Nesom Diplacus viscidus (Congdon) G.L.Nesom
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