| 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 |  |
