| Clematis coccinea Engelm. ex A. Gray | Clematis texensis Buckley | | | Clematis coccinea Engelm. ex A. Gray | Clematis texensis Buckley | 22 | 124 |
| Clematis fusca Turcz. | | a | | Clematis fusca Turcz. | | 44 | |
| Clematis fusca Turcz. var. mandshurica Regel | Clematis fusca Turcz. | | i | Clematis fusca Turcz. var.mandshurica Regel | Clematis fusca Turcz. | 45 | 44 |
| Clematis fusca Turcz. var. violacea Maxim. | | a | i | Clematis fusca Turcz. var.violacea Maxim. | | 46 | |
| Clematis pitcheri Torr. & A. Gray | | a | | Clematis pitcheri Torr. & A. Gray | | 104 | |
| Clematis reticulata Walter | | a | | Clematis reticulata Walter | | 111 | |
| Clematis simsii Sweet | Clematis crispa L. | | | Clematis simsii Sweet | Clematis crispa L. | 114 | 419680 |
| Clematis texensis Buckley | | a | | Clematis texensis Buckley | | 124 | |
| Clematis morefieldii Kral | | a | | Clematis morefieldii Kral | | 320178 | |
| Clematis crispa L. | | a | | Clematis crispa L. | | 419680 | |
| Clematis fusca Turcz. var. fusca | | a | i | Clematis fusca Turcz. var.fusca | | 448364 | |
| Clematis viorna L. | | a | | Clematis viorna L. | | 448754 | |