| Leiostemon ambiguus (Torr.) Greene | Penstemon ambiguus Torr. sect. Ambigui |
| Leiostemon frutescens (Lamb.) Raf. ex Straw | Pennellianthus frutescens (Lamb.) Crosswh. trib. Cheloneae |
| Leiostemon thurberi (Torr.) Greene | Penstemon thurberi Torr. sect. Ambigui |