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Referred to in the Register and Checklist
G- ‘Gerbar, Josef Hgy.’
- ‘Gerbeaux F. Fr.’
- ‘Gerris V. NL.’
- ‘Getz Ger.’
- ‘Geunault Fr.’
- ‘Gibbons, John UK. Zonal Specialist’
- ‘Gibson Aust.’
- ‘Gibson UK.’
- ‘Gillam, Ian Can. Tricolour Stellar Specialist’
- ‘Glass UK. (Holmesdale Nurseries)’
- ‘Godding UK.’
- ‘Godfrey UK.’
- ‘Godwin, Peter UK.’
- ‘Goeshke (Spalding)’
- ‘Gooch, Albert Aust.’
- ‘Goode and Reese USA.’
- ‘Goode UK.’
- ‘Gordon, Peter Aust.’
- ‘Gotz W. Ger.’
- ‘Gough A.H.M. Aust.’
- ‘Gough Mr. Aust.’
- ‘Graham J. & Co. Aust.’
- ‘Grainger W. Can.’
- ‘Gray UK.’
- ‘Green J. UK.’
- ‘Greeves M. UK.’
- ‘Gregersen USA.’
- ‘Greybridge Geraniums (Later Fibrex Ltd.) UK.’
- ‘Grief A.G. UK.’
- ‘Grieger F. Hgy.’
- ‘Grieve, Peter UK.’
- ‘Grolam Aust.’
- ‘Gubler, Heinrich Swz.’
- ‘Guesnet Fr.’
- ‘Guilfoyle Aust.’
- ‘Gunnett UK.’
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.’