Biology:List of Award of Garden Merit clematis

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Clematis 'Nelly Moser'

Over 70 species and cultivars of clematis currently (2016)[1] possess the Royal Horticultural Society's Award of Garden Merit, reflecting this plant's continued popularity in gardens in the United Kingdom. Clematis is a genus of woody based perennials, mostly climbers with a twining habit, though some are grown as groundcover or as herbaceous plants. They can be evergreen or deciduous. They bear flowers in all shades except black, pure blue, pure red and orange. The flowers are often large and showy. They can be single or double, fragrant or unscented, compact or vigorous, in a wide range of shapes and sizes. The flowering period varies from early spring to late summer. Many spring-flowering cultivars produce a second flush of blooms after the main display has finished, and many have attractive silky seed-heads prolonging the period of interest. Clematis can be grown against walls, fences, over pergolas and obelisks, or through other shrubs and trees.[2]

Groups

'Bill MacKenzie' (Tangutica group)

Cultivars are placed in the following groups:-

  • A; Atragene group; medium-sized climbers with nodding, bellshaped flowers early in the season
  • Ad; Atragene double-flowered; medium-sized climbers with nodding, bell-shaped double blooms flowering in spring on previous year's growth
  • E; Early large flowered group; medium-sized climbers with large star-shaped flowers on previous season's growth, in spring and early summer, often with a second flush of blooms later in the season
  • Forsteri group; dwarf or spreading evergreen shrubs or climbers, with deeply cut leaves and small white or cream flowers
  • H; Heracleifolia group; subshrubs with long, scrambling stems and abundant small flowers on the current year's growth, in summer and autumn
  • I; Integrifolia group; small subshrubs with herbaceous growth, flowers in summer and autumn
  • L; Late large-flowered group; medium-sized climbers flowering in summer and early autumn on current year's growth, with large flowers
  • M; Montana group; vigorous climbers flowering early in the season
  • Md; Montana double-flowered group; vigorous climbers flowering in late spring and early summer
  • T; Tangutica group; large climbers with small bell-shaped flowers, usually in shades of yellow or white, late in the season, often followed by silky seed heads
  • Tx; Texensis group; climbers with bell- or tulip-shaped flowers in summer and autumn, on the current year's growth
  • V; Viticella group; pinnate leaves, nodding half-open flowers on current year's growth, in summer
  • Va; Vitalba group; substantial climbers with profuse, small, erect flowers on current year's growth, in summer and autumn; also used for groundcover
Name Species Group Colour Dia. H W Image
Abundance[3] V red (wine) 7.5 4.0 1.0
Alionushka[4] I pink (rose) 5.0 1.5 0.5 Clematis Aljonushka1IME.jpg
Anna Louise 'Evithree'[5] E purple/cerise 15.0 4.0 0.5 Clematis Anna Louise 'Evithree'.jpg
Apple Blossom[6] Ar white 6.5 8.0 2.5
Arabella[7] I blue (mauve) 9.0 2.5 1.0 Clematis-'Arabella'.jpg
Arctic Queen 'Evitwo'[8] E white 15.0 4.0 1.0
Ballet Skirt[9] A/d pink 10.0 2.5 1.0
Bill MacKenzie[10] T yellow 7.0 8.0 4.0 Clematis Bill Mackenzie1a.UME (cropped).jpg
Blekitny Aniol[11] L blue (pale) 10.0 2.5 1.0 Clematis Blekitny Aniol1UME.jpg
Broughton Star[12] MD pink (deep) 6.0 8.0 5.4
Cassandra[13] C. heracleifolia blue 1.0 0.5
C. montana var. grandiflora[14] M white 7.0 12.0 4.0
C. rehderiana[15] yellow (pale) 2.5 8.0 2.5 Clematis rehderiana1b.UME.jpg
C. × durandii[16] blue (indigo) 10.0 2.5 1.0
Comtesse de Bouchaud[17] L pink (rose) 15.0 2.5 1.0 Clématite comtesse de Bouchaud.JPG
Constance[18] A pink (deep) 5.0 2.5 1.5 Clematis Alpina - geograph.org.uk - 1273662.jpg
Daniel Deronda[19] E blue (violet) 20.0 2.5 1.0 Clematis daniel deronda.JPG
Elizabeth[20] M pink (pale) 6.0 12.0 4.0 Clematis montana 'Elisabeth' J3.JPG
Ernest Markham[21] L red (crimson) 15.0 4.0 1.0 Clematis Ernest Markham.JPG
Étoile violette[22] V purple 10.0 4.0 1.5 Clematis - Etiole Violette.jpg
Foxy[23] A pink (pale) 5.0 2.5 1.5 Clématite Alpina Foxy (cropped).JPG
Frances Rivis[24] A blue (violet) / cream 5.0 2.5 1.5
Frankie[25] A blue (violet) / cream 5.0 2.5 1.5
Freckles[26] C. cirrhosa var. purpurascens yellow (pale)/maroon 5.0 4.0 1.0 Clématite Cirrhosa Freckles.jpg
Freda[27] M pink (deep) 5.0 8.0 4.0
Fujimusume[28] E blue (pale) 20.0 1.5 1.0
Gillian Blades[29] L white 15.0 2.5 1.0
Gipsy Queen[30] L purple 14.0 4.0 1.0
Golden Tiara 'Kugotia'[31] T yellow 4.0 8.0 8.0 Clematite Golden Tiara® Kugotia.jpg
Hågelby Pink'[32] Vt pink (pale) 4.0 1.0
Happy Birthday 'Zohapbi'[33] L purple 10.0 3.0 1.5
Helsingborg[34] A purple 5.0 2.5 1.5
Huldine[35] L white 10.0 4.0 2.5 Clematis Huldine.jpg
Jackmanii[36] L purple 10.0 4.0 1.0 Clematisfdfd.jpg
Jacqueline du Pré[37] L pink (rose) 6.3 2.5 1.5
Joe[38] C. × cartmanii F white 4.0 1.5 0.5 Clematis x cartmanii 'Joe' 2.JPG
Ken Donson[39] E blue (deep) 3.0 0.5
Kermesina[40] V red (crimson) 6.0 4.0 1.5
Lagoon[41] C. macropetala A blue (violet) 7.5 2.5 1.5 Clematis macropetala 'Lagoon'.jpg
Lambton Park[42] T yellow 7.0 8.0 4.0
Lasurstern[43] E blue (lavender) 7.5 2.5 1.0 0 Clematis 'Lasurstern' - Yvoire.jpg
Madame Julia Correvon[44] V red (claret) 12.5 4.0 1.5 Clematis 'Madame Julia Correvon' 2.jpg
Marie Boisselot[45] E white 20.0 4.0 1.0
Markham's Pink[46] AD pink 5.0 4.0 1.5
Mayleen[47] M pink (pale) 7.0 12.0 2.5 ClematisMayleen1a.UME.jpg
Minuet[48] V white/pink 5.0 4.0 1.0 Clematis Minuet.jpg
Mrs Cholmondeley[49] E blue (lavender) 20.0 2.5 1.0 Clematis 'Mrs Cholmondeley'.jpg
Mrs George Jackman[50] E white 18.0 2.5 1.0 Clematis 'Mrs George Jackman'.JPG
Nelly Moser[51] E pink 20.0 2.5 1.0 Clematis 'Nelly Moser'.JPG
Niobe[52] E red (ruby) 15.0 2.5 1.0 Clematis 'Niobe' (Poland, 1970) 2020 photo (50003301622).jpg
Pamela Jackman[53] C. alpina A blue (deep) 7.0 2.5 1.5
Pangbourne Pink[54] I pink (mauve) 5.0 1.0 0.5
Paul Farges[55] Va white 4.5 8.0 2.5 Clematis Paul Farges1UME.JPG
Pauline[56] Ad blue 2.5 1.5
Petit Faucon 'Evisix'[57] I blue (violet) 9.0 1.0 1.0 Clematis Evisix1b.UME.jpg
Pink Flamingo[58] A pink (pale) 4.0 2.5 1.5
Poldice[59] V violet/white 4.0 1.5
Polish Spirit[60] L purple 9.0 4.0 1.0 Clematis viticella 4470.jpg
Praecox[61] H blue (pale) 2.0 4.0 2.5 Clematis jouiniana Praecox 2777855567.jpg
Prince Charles[62] L blue (violet) 10.0 2.5 1.0 Clematis Prince Charles.JPG
Princess Diana[63] Tx red (magenta) 10.0 4.0 1.0 Clematis 'Princess Diana' 02.JPG
Purpurea Plena Elegans[64] VD purple/pink 5.0 2.5 1.0
Remembrance[65] LL pink (deep) 12.0 2.5 1.5 Clematis 'Remembrance' 02.JPG
Richard Pennell[66] E purple 20.0 2.5 1.0 Clematis 'Richard Pennell'.jpg
Roko-Kolla[67] LL white 15.0 2.5 1.0
Sunset[68] E red (magenta) 12.0 2.5 1.0 Clematis 'Sunset' 01.jpg
Tetrarose[69] C. montana var. rubens M pink (mauve) 7.5 8.0 2.5
The President[70] E blue 18.0 2.5 1.0 Clematis 'The President'.jpg
Venosa Violacea[71] V purple/white 10.0 2.5 1.0 Clematis Venosa Violacea (9462046485).jpg
Walenburg[72] V purple/white 3.0 1.0
Warszawska Nike[73] EL purple 18.0 2.5 1.0 Clematis cultivars a2.jpg
Wesselton[74] C. macropetala E blue (pale) 2.5 1.5
White Columbine[75] A white 5.0 2.5 1.5
Will Goodwin[76] EL pale violet 15.0 2.5 1.0
Wisley Cream[77] C. cirrhosa yellow (pale) 8.0 4.0 1.0
Wisley 'Evipo001'[78] Vt blue/red 13.0 4.0 1.5

References

  1. "RHS AGM Listing Oct 2016 (Ornamentals)". Royal Horticultural Society. https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals. Retrieved 7 January 2017. 
  2. RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. pp. 1136. ISBN 1405332964. 
  3. "Clematis 'Abundance'". RHS. https://www.rhs.org.uk/Plants/91373/Clematis-Abundance-(Vt)/Details. Retrieved 12 February 2020. 
  4. "Clematis 'Alionushka'". RHS. https://www.rhs.org.uk/Plants/171371/Clematis-Alionushka-(I)/Details. Retrieved 12 February 2020. 
  5. "Clematis Anna Louise = 'Evithree'". RHS. https://www.rhs.org.uk/Plants/121369/Clematis-Anna-Louise-Evithree-(PBR)-(EL)/Details. Retrieved 12 February 2020. 
  6. "Clematis 'Apple Blossom'". RHS. https://www.rhs.org.uk/Plants/210266/Clematis-Apple-Blossom-(Ar)/Details. Retrieved 12 February 2020. 
  7. "Clematis 'Arabella'". RHS. https://www.rhs.org.uk/Plants/80890/Clematis-Arabella-(I)/Details. Retrieved 12 February 2020. 
  8. "Clematis Arctic Queen = 'Evitwo'". RHS. https://www.rhs.org.uk/Plants/121364/Clematis-Arctic-Queen-Evitwo-(PBR)-(EL)/Details. Retrieved 12 February 2020. 
  9. "Clematis 'Ballet Skirt'". RHS. https://www.rhs.org.uk/Plants/211455/Clematis-Ballet-Skirt-(A-d)/Details. Retrieved 12 February 2020. 
  10. "Clematis 'Bill MacKenzie'". RHS. https://www.rhs.org.uk/Plants/89188/Clematis-Bill-MacKenzie-(Ta)/Details. Retrieved 12 February 2020. 
  11. "Clematis 'Blekitny Aniol'". RHS. https://www.rhs.org.uk/Plants/105769/Clematis-Blekitny-Aniol-(LL)/Details. Retrieved 12 February 2020. 
  12. "Clematis 'Broughton Star'". RHS. https://www.rhs.org.uk/Plants/210218/Clematis-Broughton-Star-(M-d)/Details. Retrieved 12 February 2020. 
  13. "Clematis heracleifolia 'Cassandra'". RHS. https://www.rhs.org.uk/Plants/113782/Clematis-heracleifolia-Cassandra-(H)/Details. Retrieved 12 February 2020. 
  14. "Clematis montana var. grandiflora". RHS. https://www.rhs.org.uk/Plants/210221/Clematis-montana-var-grandiflora-(M)/Details. Retrieved 12 February 2020. 
  15. "Clematis rehderiana". RHS. https://www.rhs.org.uk/Plants/3975/Clematis-rehderiana/Details. Retrieved 12 February 2020. 
  16. "Clematis × durandii". RHS. https://www.rhs.org.uk/Plants/91305/Clematis-x-durandii/Details. Retrieved 12 February 2020. 
  17. "Clematis 'Comtesse de Bouchaud'". RHS. https://www.rhs.org.uk/Plants/98389/Clematis-Comtesse-de-Bouchaud-(LL)/Details. Retrieved 12 February 2020. 
  18. "Clematis 'Constance'". RHS. https://www.rhs.org.uk/Plants/210208/Clematis-Constance-(A)/Details. Retrieved 12 February 2020. 
  19. "Clematis 'Daniel Deronda'". RHS. https://www.rhs.org.uk/Plants/96207/Clematis-Daniel-Deronda-(EL)/Details. Retrieved 12 February 2020. 
  20. "Clematis 'Elizabeth'". RHS. https://www.rhs.org.uk/Plants/210260/Clematis-Elizabeth-(M)/Details. Retrieved 12 February 2020. 
  21. "Clematis 'Ernest Markham'". RHS. https://www.rhs.org.uk/Plants/96860/Clematis-Ernest-Markham-(LL)/Details. Retrieved 12 February 2020. 
  22. "Clematis 'Étoile violette'". RHS. https://www.rhs.org.uk/Plants/92936/Clematis-Etoile-Violette-(Vt)/Details. Retrieved 12 February 2020. 
  23. "Clematis 'Foxy'". RHS. https://www.rhs.org.uk/Plants/210211/Clematis-Foxy-(A)/Details. Retrieved 12 February 2020. 
  24. "Clematis 'Frances Rivis'". RHS. https://www.rhs.org.uk/Plants/210212/Clematis-Frances-Rivis-(A)/Details. Retrieved 12 February 2020. 
  25. "Clematis 'Frankie'". RHS. https://www.rhs.org.uk/Plants/210213/Clematis-Frankie-(A)/Details. Retrieved 12 February 2020. 
  26. "Clematis cirrhosa var. purpurascens 'Freckles'". RHS. https://www.rhs.org.uk/Plants/89092/Clematis-cirrhosa-var-purpurascens-Freckles-(C)/Details. Retrieved 12 February 2020. 
  27. "Clematis 'Freda'". RHS. https://www.rhs.org.uk/Plants/210261/Clematis-Freda-(M)/Details. Retrieved 12 February 2020. 
  28. "Clematis 'Fujimusume'". RHS. https://www.rhs.org.uk/Plants/176002/Clematis-Fujimusume-(EL)/Details. Retrieved 12 February 2020. 
  29. "Clematis 'Gillian Blades'". RHS. https://www.rhs.org.uk/Plants/80121/i-Clematis-i-Gillian-Blades-(EL)/Details?returnurl=%2fplants%2fsearch-results%3fform-mode%3dfalse%26query%3dclematis%2bgillian%2bblades%26aliaspath%3d%252fplants%252fsearch-results. Retrieved 6 January 2017. 
  30. "Clematis 'Gipsy Queen'". RHS. https://www.rhs.org.uk/Plants/82290/Clematis-Gipsy-Queen-(LL)/Details. Retrieved 12 February 2020. 
  31. "Clematis Golden Tiara = 'Kugotia'". RHS. https://www.rhs.org.uk/Plants/111737/Clematis-Golden-Tiara-Kugotia-(PBR)-(Ta)/Details. Retrieved 12 February 2020. 
  32. "Clematis 'Hagelby Pink'". RHS. https://www.rhs.org.uk/Plants/331776/Clematis-Hagelby-Pink-(Vt)/Details. Retrieved 9 July 2013. 
  33. "Clematis Happy Birthday = 'Zohapbi'". RHS. https://www.rhs.org.uk/Plants/295303/Clematis-Happy-Birthday-Zohapbi-(PBR)-(LL)/Details. Retrieved 12 February 2020. 
  34. "Clematis 'Helsingborg'". RHS. https://www.rhs.org.uk/Plants/131729/Clematis-Helsingborg-(A)/Details. Retrieved 12 February 2020. 
  35. "Clematis 'Huldine'". RHS. https://www.rhs.org.uk/Plants/92677/Clematis-Huldine-(LL)/Details. Retrieved 12 February 2020. 
  36. "Clematis 'Jackmanii'". RHS. https://www.rhs.org.uk/Plants/96731/Clematis-Jackmanii-(LL)/Details. Retrieved 12 February 2020. 
  37. "Clematis 'Jacqueline du Pré'". RHS. https://www.rhs.org.uk/Plants/210217/Clematis-Jacqueline-du-Pre-(A)/Details. Retrieved 12 February 2020. 
  38. "Clematis × cartmanii 'Joe'". RHS. https://www.rhs.org.uk/Plants/90527/Clematis-x-cartmanii-Joe-(Fo-m)/Details. Retrieved 12 February 2020. 
  39. "Clematis 'Ken Donson'". RHS. https://www.rhs.org.uk/Plants/74765/Clematis-Ken-Donson-(EL)/Details. Retrieved 12 February 2020. 
  40. "Clematis 'Kermesina'". RHS. https://www.rhs.org.uk/Plants/94497/Clematis-Kermesina-(Vt)/Details. Retrieved 12 February 2020. 
  41. "Clematis macropetala 'Lagoon'". RHS. https://www.rhs.org.uk/Plants/42009/Clematis-macropetala-Lagoon-Jackman-1959-(A-d)/Details. Retrieved 12 February 2020. 
  42. "Clematis 'Lambton Park'". RHS. https://www.rhs.org.uk/Plants/210870/Clematis-Lambton-Park-(Ta)/Details. Retrieved 12 February 2020. 
  43. "Clematis 'Lasurstern'". RHS. https://www.rhs.org.uk/Plants/99627/Clematis-Lasurstern-(EL)/Details. Retrieved 12 February 2020. 
  44. "Clematis 'Madame Julia Correvon'". RHS. https://www.rhs.org.uk/Plants/44905/Clematis-Madame-Julia-Correvon-(Vt)/Details. Retrieved 12 February 2020. 
  45. "Clematis 'Marie Boisselot'". RHS. https://www.rhs.org.uk/Plants/92156/Clematis-Marie-Boisselot-(EL)/Details. Retrieved 12 February 2020. 
  46. "Clematis 'Markham's Pink'". RHS. https://www.rhs.org.uk/Plants/209989/Clematis-Markham-s-Pink-(A-d)/Details. Retrieved 12 February 2020. 
  47. "Clematis 'Mayleen'". RHS. https://www.rhs.org.uk/Plants/210263/Clematis-Mayleen-(M)/Details. Retrieved 12 February 2020. 
  48. "Clematis 'Minuet'". RHS. https://www.rhs.org.uk/Plants/96722/Clematis-Minuet-(Vt)/Details. Retrieved 12 February 2020. 
  49. "Clematis 'Mrs Cholmondeley'". RHS. https://www.rhs.org.uk/Plants/59413/Clematis-Mrs-Cholmondeley-(EL)/Details. Retrieved 12 February 2020. 
  50. "Clematis 'Mrs George Jackman'". RHS. https://www.rhs.org.uk/Plants/46501/Clematis-Mrs-George-Jackman-(EL)/Details. Retrieved 12 February 2020. 
  51. "Clematis 'Nelly Moser'". RHS. https://www.rhs.org.uk/Plants/57420/Clematis-Nelly-Moser-(EL)/Details. Retrieved 12 February 2020. 
  52. "Clematis 'Niobe'". RHS. https://www.rhs.org.uk/Plants/96069/Clematis-Niobe-(EL)/Details. Retrieved 12 February 2020. 
  53. "Clematis alpina 'Pamela Jackman'". RHS. https://www.rhs.org.uk/Plants/96555/Clematis-alpina-Pamela-Jackman-(A)/Details. Retrieved 12 February 2020. 
  54. "Clematis 'Pangbourne Pink'". RHS. https://www.rhs.org.uk/Plants/211256/Clematis-Pangbourne-Pink-(I)/Details. Retrieved 12 February 2020. 
  55. "Clematis 'Paul Farges'". RHS. https://www.rhs.org.uk/Plants/86150/Clematis-Paul-Farges-(Vb)/Details. Retrieved 12 February 2020. 
  56. "Clematis 'Pauline'". RHS. https://www.rhs.org.uk/Plants/209995/i-Clematis-i-Pauline-(A-d)/Details?returnurl=%2fplants%2fsearch-results%3fform-mode%3dtrue%26query%3dclematis%2bpauline%26aliaspath%3d%252fplants%252fsearch-results. Retrieved 7 January 2017. 
  57. "Clematis Petit Faucon = 'Evisix'". RHS. https://www.rhs.org.uk/Plants/121385/Clematis-Petit-Faucon-Evisix-(PBR)-(I)/Details. Retrieved 12 February 2020. 
  58. "Clematis 'Pink Flamingo'". RHS. https://www.rhs.org.uk/Plants/95347/Clematis-Pink-Flamingo-(A)/Details. Retrieved 12 February 2020. 
  59. "Clematis 'Poldice'". RHS. https://www.rhs.org.uk/Plants/249316/Clematis-Poldice-(Vt)/Details. Retrieved 12 February 2020. 
  60. "Clematis 'Polish Spirit'". RHS. https://www.rhs.org.uk/Plants/29478/Clematis-Polish-Spirit-(LL)/Details. Retrieved 12 February 2020. 
  61. "Clematis 'Praecox'". RHS. https://www.rhs.org.uk/Plants/211341/Clematis-Praecox-(H)/Details. Retrieved 12 February 2020. 
  62. "Clematis 'Prince Charles'". RHS. https://www.rhs.org.uk/Plants/55115/Clematis-Prince-Charles-(LL)/Details. Retrieved 12 February 2020. 
  63. "Clematis 'Princess Diana'". RHS. https://www.rhs.org.uk/Plants/118677/Clematis-Princess-Diana-(T)/Details. Retrieved 12 February 2020. 
  64. "Clematis 'Purpurea Plena Elegans'". RHS. https://www.rhs.org.uk/Plants/210954/Clematis-Purpurea-Plena-Elegans-(Vt-d)/Details. Retrieved 12 February 2020. 
  65. "Clematis 'Remembrance'". RHS. https://www.rhs.org.uk/Plants/227091/i-Clematis-i-Remembrance-(LL)/Details?returnurl=%2fplants%2fsearch-results%3fform-mode%3dfalse%26query%3dclematis%2bremembrance%26aliaspath%3d%252fplants%252fsearch-results. Retrieved 7 January 2017. 
  66. "Clematis 'Richard Pennell'". RHS. https://www.rhs.org.uk/Plants/95160/Clematis-Richard-Pennell-(EL)/Details. Retrieved 12 February 2020. 
  67. "Clematis 'Roko-Kolla'". RHS. https://www.rhs.org.uk/Plants/124310/Clematis-Roko-Kolla-(LL)/Details. Retrieved 12 February 2020. 
  68. "Clematis 'Sunset'". RHS. https://www.rhs.org.uk/Plants/86175/Clematis-Sunset-(EL)/Details. Retrieved 12 February 2020. 
  69. "Clematis montana var. rubens 'Tetrarose'". RHS. https://www.rhs.org.uk/Plants/90318/Clematis-montana-var-rubens-Tetrarose-(M)/Details. Retrieved 12 February 2020. 
  70. "Clematis 'The President'". RHS. https://www.rhs.org.uk/Plants/53221/Clematis-The-President-(EL)/Details. Retrieved 12 February 2020. 
  71. "Clematis 'Venosa Violacea'". RHS. https://www.rhs.org.uk/Plants/99793/Clematis-Venosa-Violacea-(Vt)/Details. Retrieved 12 February 2020. 
  72. "Clematis 'Walenburg'". RHS. https://www.rhs.org.uk/Plants/110029/Clematis-Walenburg-(Vt)/Details?returnurl=%2fplants%2fsearch-results%3fform-mode%3dtrue%26context%3db%253d0%2526hf%253d10%2526l%253den%2526q%253dclematis%252broko-kolla%2526s%253ddesc%252528plant_merged%252529%2526sl%253dplantForm%26query%3dclematis%2bwalenburg%26aliaspath%3d%252fplants%252fsearch-results. Retrieved 7 January 2017. 
  73. "Clematis 'Warszawska Nike'". RHS. https://www.rhs.org.uk/Plants/52716/Clematis-Warszawska-Nike-(EL)/Details. Retrieved 12 February 2020. 
  74. "Clematis macropetala 'Wesselton'". RHS. https://www.rhs.org.uk/Plants/124243/Clematis-macropetala-Wesselton-(A-d)/Details. Retrieved 12 February 2020. 
  75. "Clematis 'White Columbine'". RHS. https://www.rhs.org.uk/Plants/210241/Clematis-White-Columbine-(A)/Details. Retrieved 12 February 2020. 
  76. "Clematis 'Will Goodwin'". RHS. https://www.rhs.org.uk/Plants/83374/Clematis-Will-Goodwin-(EL)/Details. Retrieved 12 February 2020. 
  77. "Clematis cirrhosa 'Wisley Cream'". RHS. https://www.rhs.org.uk/Plants/95824/Clematis-cirrhosa-Wisley-Cream-(C)/Details. Retrieved 12 February 2020. 
  78. "Clematis 'Wisley = 'Evipo001'". RHS. https://www.rhs.org.uk/Plants/197717/Clematis-Wisley-Evipo001-(PBR)-(Vt)/Details. Retrieved 12 February 2020.