| Billardiera alpina (McGill.) E.M.Benn. | Rhytidosporum alpinum McGill. |
| Billardiera explanata Moench | Verbena canadensis (L.) Britton |
| Billardiera prostrata (McGill.) E.M.Benn. | Rhytidosporum prostratum McGill. |
| Billardiera alpina (McGill.) E.M.Benn. | Rhytidosporum alpinum McGill. |
| Billardiera explanata Moench | Verbena canadensis (L.) Britton |
| Billardiera prostrata (McGill.) E.M.Benn. | Rhytidosporum prostratum McGill. |