| Clematis albicoma coactilis Fernald, Rhodora 45: 407 (1943) | Clematis coactilis (Fernald) Keener |
| Clematis aristata gentianoides (DC.) F.Muell. | Clematis gentianoides DC. |
| Clematis arizonica A.Heller | Clematis hirsutissima Pursh |
| Clematis bakeri Greene | Clematis hirsutissima Pursh |
| Clematis capensis (L.) Poir. | Knowltonia tenuifolia (L.f.) Mosyakin |
| Clematis columbiana grosseserrata (Rydb.) Roy L. Taylor & MacBryde | Clematis occidentalis var. grosseserrata (Rydb.) Pringle |
| Clematis douglasii bigelovii (Torr.) M.E.Jones | Clematis bigelovii Torr. |
| Clematis douglasii Hook. | Clematis hirsutissima Pursh |
| Clematis fremontii riehlii R.O.Erickson | Clematis fremontii S.Watson |
| Clematis gentianoides normalis Domin | Clematis gentianoides DC. |
| Clematis grosseserrata (Rydb.) Ackerf. | Clematis occidentalis var. grosseserrata (Rydb.) Pringle |
| Clematis integrifolia fremontii (S.Watson) Kuntze | Clematis fremontii S.Watson |
| Clematis nutans aethusifolia (Turcz.) Kuntze | Clematis aethusifolia Turcz. |
| Clematis occidentalis dissecta (C.L.Hitchc.) A.Haines | Clematis occidentalis var. grosseserrata (Rydb.) Pringle |
| Clematis ochroleuca fremontii (S.Watson) James | Clematis fremontii S.Watson |
| Clematis palmeri Rose | Clematis bigelovii Torr. |
| Clematis pinetorum Tidestr. | Clematis columbiana (Nutt.) Torr. & A.Gray |
| Clematis pitcheri bigelovii Torr. | Clematis bigelovii Torr. |
| Clematis pseudoatragene Kuntze | Clematis columbiana (Nutt.) Torr. & A.Gray |
| Clematis ranunculoides tomentosa Finet & Gagnep., Bull. Soc. Bot. France 50: 544 (1903) | Clematis pinchuanensis W.T.Wang & M.Y.Fang |
| Clematis tenuifolia (L.f.) Poir. | Knowltonia tenuifolia (L.f.) Mosyakin |
| Clematis tibetana pamiralaica (Grey-Wilson) W.T.Wang | Clematis pamiralaica Grey-Wilson |