and others). The perennials and annuals differ as groups from each other by an inversion sequence on chromosome 8. Evidence tentatively indicates that the perennials evolved from annual ancestors, although some evidence has been interpreted to indicate that E. nasuta evolved from E. guttata in central California between 500,000 and 200,000 years ago and since then become primarily a self-pollinator. Relationships among the apparently closely related E. tilingii, E. minor, and E. caespitosa are not clearly understood. Some currently recognized species may be just variants of other species: E. arenicola, E. brachystylis, E. regni. Chromosomal issues may affect the classification of some species: E. corallina, E. guttata, E. nasuta, E. tilingii, and E. utahensis. Species Species alphabetically , Plants of the World Online accepted the following species and hybrids: Erythranthe acutidens (Greene) G.L.Nesom Erythranthe alsinoides (Douglas ex Benth.) G.L.Nesom & N.S.Fraga – chickweed monkey-flower (British Columbia to northern California) Erythranthe ampliata (A.L.Grant) G.L.Nesom Erythranthe androsacea (Curran ex Greene) N.S.Fraga – rockjasmine monkey-flower (California) Erythranthe arenaria (A.L.Grant) G.L.Nesom Erythranthe arenicola (Pennell) G.L.Nesom Erythranthe arvensis (Greene) G.L.Nesom Erythranthe austrolatidens G.L.Nesom Erythranthe barbata (Greene) N.S.Fraga Erythranthe bhutanica (Yamazaki) G.L.Nesom – (Asia) Erythranthe bicolor (Hartw. ex Benth.) G.L.Nesom & N.S.Fraga – yellow and white monkey-flower (California) Erythranthe bodinieri (Vaniot) G.L.Nesom – (Asia) Erythranthe brachystylis (Edwin) G.L.Nesom Erythranthe bracteosa (P.C.Tsoong) G.L.Nesom – (Asia) Erythranthe breviflora (Piper) G.L.Nesom – (British Columbia to California to Wyoming) Erythranthe brevinasuta G.L.Nesom Erythranthe breweri (Greene) G.L.Nesom & N.S.Fraga – Brewer's monkey-flower (British Columbia to California to Colorado) Erythranthe bridgesii (Benth.) G.L.Nesom – (South America) Erythranthe caespitosa (Greene) G.L.Nesom Erythranthe calcicola N.S.Fraga Erythranthe calciphila (Gentry) G.L.Nesom Erythranthe cardinalis (Douglas ex Benth.) Spach – scarlet monkey-flower (southwestern United States and Baja California) Erythranthe carsonensis N.S.Fraga – Carson Valley monkey-flower (California and Nevada) Erythranthe charlestonensis G.L.Nesom Erythranthe chinatiensis G.L.Nesom Erythranthe cinnabarina G.L.Nesom Erythranthe corallina (Greene) G.L.Nesom Erythranthe cordata (Greene) G.L.Nesom Erythranthe cuprea (Dombrain) G.L.Nesom – Flor de cobre (Eng: copper flower) (central and southern Chile) Erythranthe decora (A.L.Grant) G.L.Nesom Erythranthe dentata (Nutt. ex Benth.) G.L.Nesom – toothleaf monkey-flower, coastal monkey-flower (British Columbia to northern California) Erythranthe dentiloba (B.L.Rob. & Fernald) G.L.Nesom Erythranthe depressa (Phil.) G.L.Nesom Erythranthe diffusa (A.L.Grant) N.S.Fraga Erythranthe diminuens G.L.Nesom – (Sonora, Mexico) Erythranthe discolor (A.L.Grant) N.S.Fraga Erythranthe eastwoodiae (Rydb.) G.L.Nesom & N.S.Fraga Erythranthe erubescens G.L.Nesom Erythranthe exigua (A.Gray) G.L.Nesom & N.S.Fraga – San Bernardino Mountains monkey-flower (southern California, Baja California) Erythranthe filicaulis (S.Watson) G.L.Nesom & N.S.Fraga – slender-stemmed monkey-flower (California)