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Referred to in the Register and Checklist
L- ‘Laing, John UK.’
- ‘Lake, Sidney UK. (Ashdown Nurseries)’
- ‘Lambert, George UK.’
- ‘Lance F.D. Aust.’
- ‘Langley-Smith, Arthur UK. Angel Specialist’
- ‘Lansbury UK.’
- ‘Laxton UK.’
- ‘Le Ciuteulx Fr.’
- ‘Lea, Ken. UK. Tricolour Leaf Zonal Specialist’
- ‘Leach UK.’
- ‘Leclerc Fr.’
- ‘Lecoq, Henri Fr.’
- ‘Lee, James, John & Charles UK. (The Vineyard Nursery)’
- ‘Lee, Eric UK.’
- ‘Lemoine, Victor Fr.’
- ‘Letellier Fr.’
- ‘Leuengerger, Ernst. Swz.’
- ‘Lewis UK.’
- ‘Lierval Fr.’
- ‘Lindomar Nursery USA.’
- ‘Lines Mrs L. Aust.’
- ‘Little H. UK.’
- ‘Little of Bedford UK.’
- ‘Livesey Aust.’
- ‘Ljungquist L. Swe.’
- ‘Llewellyn Aust.’
- ‘Lloyd-Dean UK.’
- ‘Lloyd-Quigley USA.’
- ‘Lobner Swz.’
- ‘Loder UK.’
- ‘Lodes UK.’
- ‘Logee, Ernest USA. (Logeeās Greenhouses)’
- ‘Lound UK.’
- ‘Lumsden UK.’
- ‘Luxford Keith Ltd. UK.’
- ‘Lyne P.E. UK.’
- ‘Lynes of Warwick UK.’
M- ‘MacInerney Mrs. Aust.’
- ‘Magnollay Cz.’
- ‘Magson UK.’
- ‘Malet Beig.’
- ‘Mallet Fr.’
- ‘Manns K.W. & N. Aust. (La Jolla Nursery)’
- ‘Manns Mrs. N.’
- ‘Margate Parks Dept. UK.’
- ‘Martin of Crowborough UK.’
- ‘Martin, Mr & Mrs Roland UK.’
- ‘Martine Fr.’
- ‘Martorel Fr.’
- ‘Massey J. UK.’