Viorna albicoma (Wherry) Moldenke | Clematis albicoma Wherry |
Viorna bigelovii (Torr,) A.Heller | Clematis bigelovii Torr. |
Viorna fremontii (S.Watson) A,Heller | Clematis fremontii S.Watson |
Viorna hirsutissima (Pursh) A.Heller | Clematis hirsutissima Pursh |
Viorna palmeri (Rose) Wooton & Standl. | Clematis bigelovii Torr. |