Rating | Plant | Thumbnail |
| Clematis, Viticella Clematis 'Abigail' Clematis Hybridized by Fretwell | |
| Clematis, Early Large-flowered Clematis 'Abilene' Clematis Hybridized by Evison-Olesen, 2011 Additional info: (Boulevard® Collection; aka Evipo027, Abilene™) |  |
| Clematis, Early Large-flowered Clematis 'Abuki' Clematis Hybridized by Hasegawa, 2007 | |
 | Clematis, Viticella Clematis, Late Small-flowered Clematis 'Abundance' Clematis Hybridized by Morel-Jackman, 1914 Additional info: (aka Purple Abundance) |  |
| Clematis, Texensis-Viorna Clematis, Small-flowered Clematis 'Ada Moon' Clematis Hybridized by Straver, 2005 | |
| Clematis, Early Large-flowered Clematis 'Ada Sari' Clematis Hybridized by Franczak, 1994 | |
| Clematis, Early Large-flowered Clematis 'Adrian James' Clematis Hybridized by Scholes, 2004 | |
| Clematis, Early Large-flowered Clematis 'Adriano Chelentano' Clematis Hybridized by Reinwald, 1983 Additional info: (aka Adriano Czelentano) | |
| Clematis, Cirrhosa, Winter Clematis 'Advent Bells' Clematis cirrhosa Hybridized by Nunn, 2009 | |
| Clematis 'Afro' Clematis recta var. purpurea | |
| Clematis, Early Large-flowered Clematis 'Agnieszka' Clematis Hybridized by Franczak, 1996 | |
| Clematis, Early Large-flowered Clematis 'Ai Nor' Clematis Hybridized by Beskaravainaja, 1968 Additional info: (aka Aj-nor) |  |
| Clematis, Early Large-flowered Clematis 'Aida' Clematis Hybridized by Straver, 2006 | |
| Clematis, Viticella Clematis 'Aino' Clematis Hybridized by Kivistik, 1983 | |
| Clematis, Early Large-flowered Clematis 'Aisujoo' Clematis Hybridized by Joosha, 1985 | |
| Clematis, Early Large-flowered Clematis 'Ajisai' Clematis Hybridized by Kurasawa, 1986 | |
| Clematis, Early Large-flowered Clematis 'Akagi' Clematis Hybridized by Nara, 1985 | |
| Clematis, Early Large-flowered Clematis 'Akaishi' Clematis Hybridized by Tane Co., 1996 | |
| Clematis, Early Large-flowered Clematis 'Akane' Clematis Hybridized by Murayama, 1997 | |
| Clematis, Early Large-flowered Clematis 'Akanegumo' Clematis Hybridized by Taheuchi, 1992 | |
| Clematis, Early Large-flowered Clematis 'Akemi' Clematis Hybridized by Siromono-Joosha, 1985 | |
| Clematis, Late Large-flowered Clematis 'Aki' Clematis Hybridized by Kala, 1998 | |
| Clematis, Early Large-flowered Clematis 'Akiko' Clematis Hybridized by Saegusa, 1990 | |
| Clematis, Viticella Clematis 'Aksel' Clematis Hybridized by Kivistik, 1998 | |
| Clematis, Early Large-flowered Clematis 'Alabast' Clematis Hybridized by Olesen-Poulsen, 1989 Additional info: (aka Poulala PBR) |  |
| Clematis, Early Large-flowered Clematis 'Alaina' Clematis Hybridized by Evison, 2012 Additional info: (aka Evipo056) | |
| Clematis, Heracleifolia Clematis 'Alan Bloom' Clematis Additional info: (aka Alblo, Bressingham Bluebird) | |
| Clematis, Viticella Clematis 'Alan Blyth' Clematis Hybridized by Blyth, 2011 | |
| Clematis, Herbaceous Clematis, Integrifolia Clematis 'Alba' Clematis Hybridized by Zubrowski, 1985 |  |
| Heirloom Clematis, Viticella Clematis 'Alba' Clematis Hybridized by Carriere, 1879 | |
| Clematis, Herbaceous Clematis, Integrifolia Clematis 'Alba Chirifu' Clematis Hybridized by Chikuma, 2009 | |
| Clematis, Luxurious White Clematis, Viticella Clematis 'Alba Luxurians' Clematis Hybridized by Veitch, 1990 |  |
 | Clematis, Double Clematis 'Alba Plena' Clematis Hybridized by Unknown, 1816 Additional info: (aka Flore Pleno, Plena, Florida Sieboldiana Alba Plena) |  |
| Clematis, Early Large-flowered Clematis 'Albatross' Clematis Hybridized by Pyne, 2001 | |
| Clematis, Atragene Clematis, Early Small-flowered Clematis 'Albert' Clematis Hybridized by Zwijnenburg | |
| Clematis, Alpine Clematis, Atragene Clematis 'Albiflora' Clematis Hybridized by Johnson, 1955 | |
| Clematis, Atragene Clematis, Early Small-flowered Clematis 'Albina Plena' Clematis Hybridized by Johnson, 1982 Additional info: (aka Albino Pride) | |
 | Clematis, Heracleifolia Clematis 'Alblo' Clematis Hybridized by Bloom, 1990 Additional info: (PP11498; aka Alan Bloom, Bressingham Bluebird) |  |
| Clematis, Early Large-flowered Clematis 'Aleksandrit' Clematis Hybridized by Beskaravainaja, 1967 Additional info: (aka Alexsandrit) | |
| Clematis, Montana Clematis, Early Small-flowered Clematis 'Alexander' Clematis Hybridized by Alexander, 1961 |  |