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Used as verification of names of cultivars and referred to in the Register and Checklist
C- ‘Caledonian Nurseries, The UK.’
- ‘Canberra Geranium & Fuchsia Society & Horticultural Society Shows, Victoria & Queensland Societies Aust. 2004 – 2009’
- ‘Cannell H. & Son UK.’
- ‘Carawill Aust.’
- ‘Carobil Farm & Greenhouses USA.’
- ‘Cassell UK.’
- ‘Cedar Nursery, Abbott, Peter G. UK.’
- ‘Claremont Nurseries (Stinton’s) Aust.’
- ‘Clayton UK.’
- ‘CLF (Spalding)’
- ‘Clifford UK.’
- ‘Clifton Geranium Nursery, The UK.’
- ‘Coates F.R.E. Nurseries Aust.’
- ‘Cole J.W. & Son UK.’
- ‘Combet Aust.’
- ‘Conway Gardens USA.’
- ‘Cook UK.’
- ‘Cook’s Geranium Nursery USA. Coolkenny USA.’
- ‘Cool’s Aust.’
- ‘Cox UK.’
- ‘Cremone Nursery Aust.’
- ‘Cremone Nursery Aust.’
- ‘Cypress Nursery (Bennett T.A.) UK.’