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Referred to in the Register and Checklist
H- ‘Hackett E & W. Aust.’
- ‘Haird UK.’
- ‘Hall, Mollie UK.’
- ‘Hallworth UK.’
- ‘Hally UK. (Hally’s Nursery)’
- ‘Hanford (Spalding)’
- ‘Hankins USA.’
- ‘Hanley USA.’
- ‘Hansen’
- ‘Harney Can.’
- ‘Harrall John UK.’
- ‘Harris M. UK.’
- ‘Harrison L. & J.S. UK. (Harrison’s of Sutton Scarsdale)’
- ‘Harrison R.E. & Co. Ltd. NZ.’
- ‘Hartmann Aust.’
- ‘Hartsook, Francis USA.’
- ‘Haswell Aust.’
- ‘Hatchard, Mrs. Denise UK. (Albermule Nursery Wales)’
- ‘Hausler, Mrs. Traute. Can.’
- ‘Hawkins of Hidcote Manor UK.’
- ‘Hawley Can.’
- ‘Hayes NZ.’
- ‘Hayes UK.’
- ‘Headley, Frank UK.’
- ‘Heard Aust.’
- ‘Heather G. Aust.’
- ‘Heide Mrs. A. USA.’
- ‘Henderson Bert. UK. Huddersfield Angel Specialist’
- ‘Henderson E.G. & Son UK.’
- ‘Henderson Peter USA.’
- ‘Hendy, Mrs Lola S. Aust. Tarronlea Nursery’
- ‘Henley, Robert M. USA.’
- ‘Henstridge UK.’
- ‘Herlout Fr.’
- ‘Herney (Spalding)’
- ‘Herraiz M.P. Swe.’
- ‘Hickman UK. (Southend Parks and Gardens)’
- ‘Hieke Cz.’
- ‘Hill Fr.’
- ‘Hill G.T. UK. (St. Helen’s Nursery)’
- ‘Hill USA.’
- ‘Hillier UK.’
- ‘Hinchliffe, John UK.’
- ‘Hinsdale USA.’
- ‘Hirt, Mrs. Elsie Aust.’
- ‘Hock & Smith Swz.’
- ‘Hoddinott UK.’
- ‘Hodge H. UK.’
- ‘Hodges W. UK.’
- ‘Hodgkins Aust.’