| Eucephalus vialis M. E. Bradshaw | | a | | Eucephalus vialis M. E. Bradshaw | | 400893 | |
| Eucephalus gormanii Piper | | a | | Eucephalus gormanii Piper | | 433944 | |
| Eucephalus breweri (A. Gray) G. L. Nesom | | a | | Eucephalus breweri (A. Gray) G. L. Nesom | | 434100 | |
| Eucephalus brickellioides (Greene) G. L. Nesom | | a | | Eucephalus brickellioides (Greene) G. L. Nesom | | 434101 | |
| Eucephalus elegans Nutt. | | a | | Eucephalus elegans Nutt. | | 434102 | |
| Eucephalus engelmannii (D. C. Eaton) Greene | | a | | Eucephalus engelmannii (D. C. Eaton) Greene | | 434103 | |
| Eucephalus glabratus (Greene) Greene | | a | | Eucephalus glabratus (Greene) Greene | | 434105 | |
| Eucephalus glaucescens (A. Gray) Greene | | a | | Eucephalus glaucescens (A. Gray) Greene | | 434106 | |
| Eucephalus ledophyllus (A. Gray) Greene | | a | | Eucephalus ledophyllus (A. Gray) Greene | | 434107 | |
| Eucephalus paucicapitatus (B. L. Rob.) Greene | | a | | Eucephalus paucicapitatus (B. L. Rob.) Greene | | 434108 | |
| Eucephalus tomentellus (Greene) Greene | | a | | Eucephalus tomentellus (Greene) Greene | | 434109 | |
| Eucephalus glaucus Nutt. | Herrickia glauca (Nutt.) Brouillet | | | Eucephalus glaucus Nutt. | Herrickia glauca (Nutt.) Brouillet | 434120 | 460269 |