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In the following list, cultivar names have been recorded without attribution or description and additional information is unavailable at the time of going to print.
History or knowledge of these cultivars should be sent to the Registrar for inclusion in the Addendum.
L- ‘La Vesuve’
- ‘Lacteum Z.’
- ‘Lady Bridport R.’
- ‘Lady Compton’
- ‘Lady Cottenham’
- ‘Lady Denbigh’
- ‘Lady E. Boulteel’
- ‘Lady Essex’
- ‘Lady Eva Campbell’
- ‘Lady Flora <1842’
- ‘Lady Forsden’
- ‘Lady Franville’
- ‘Lady Genevieve’
- ‘Lady Gipps Z.’
- ‘Lady Graham Moore’
- ‘Lady Granville’
- ‘Lady Hastings’
- ‘Lady Isabella R.’
- ‘Lady J. Burton R.’
- ‘Lady Jane Peel’
- ‘Lady Katherine’
- ‘Lady Kelly’
- ‘Lady Kitty R.’
- ‘Lady Lumsden’
- ‘Lady MacDonnell’
- ‘Lady Marshall’
- ‘Lady Meriot’
- ‘Lady Mildmay’
- ‘Lady Murray’
- ‘Lady Nithsdale’
- ‘Lady Norfolk’
- ‘Lady of Shallot’
- ‘Lady of the Isles’
- ‘Lady Perth’
- ‘Lady Prudhoe’
- ‘Lady Sophia Pelham Z.’
- ‘Lady St. Germain’
- ‘Lavender Splendour’
- ‘Lavia’
- ‘Le Notre Z.’
- ‘Leah’
- ‘Leilia Z.’
- ‘Leilia Jones’
- ‘Lelia Z.’
- ‘Lemon Sppd.’
- ‘Leonide’
- ‘Lesbia’
- ‘Lieutenant Tisserand Z.’
- ‘Liever Dorront’
- ‘Life Guardsman’