| Diplacus arachnoideus Greene | Diplacus longiflorus Nutt. |
| Diplacus aurantiacus aridus (Abrams) D.J.Keil | Diplacus aridus Abrams |
| Diplacus aurantiacus grandiflorus (Lindl.) D.J.Keil | Diplacus grandiflorus (Lindl.) Groenl. |
| Diplacus aurantiacus linearis (Benth.) D.J.Keil | Diplacus linearis (Benth.) Greene |
| Diplacus aurantiacus longiflorus (Nutt.) D.J.Keil | Diplacus longiflorus Nutt. |
| Diplacus aurantiacus parviflorus (Greene) D.J.Keil | Diplacus parviflorus Greene |
| Diplacus aurantius G.Don | Diplacus aurantiacus (Curtis) Jeps. |
| Diplacus cardinalis (Douglas ex Benth.) Groenl. | Erythranthe cardinalis (Douglas ex Benth.) Spach |
| Diplacus fasciculatus (Pennell) McMinn | Diplacus linearis (Benth.) Greene |
| Diplacus glutinosus aurantiacus (Curtis) Lindl. | Diplacus aurantiacus (Curtis) Jeps. |
| Diplacus glutinosus grandilforus Lindl., Paxton's Fl. Gard. 3: t. 92 (1852) | Diplacus grandiflorus (Lindl.) Groenl. |
| Diplacus glutinosus pubescens Torr. | Diplacus longiflorus Nutt. |
| Diplacus grandflorus Greene | Diplacus aurantiacus (Curtis) Jeps. |
| Diplacus latifolius Nutt. | Diplacus aurantiacus (Curtis) Jeps. |
| Diplacus leptanthus Nutt. | Diplacus aurantiacus (Curtis) Jeps. |
| Diplacus longiflorus grandiflorus (Greene) Jeps. | Diplacus aurantiacus (Curtis) Jeps. |
| Diplacus longiflorus grandiflorus (Lindl.) Jeps. | Diplacus grandiflorus (Lindl.) Groenl. |
| Diplacus longiflorus linearis (Benth.) McMinn | Diplacus linearis (Benth.) Greene |
| Diplacus longiflorus rutilus (A.L.Grant) McMinn | Diplacus rutilus (A.L.Grant) McMinn |
| Diplacus speciosus Burtt Davy | Diplacus longiflorus Nutt. |