The orchid Oncidesa Mayfair is a hybrid registered with the Royal Horticultural Society by R.F.Orchids in 1998.
Top three species ancestors and their influences are

• Oncidium sphacelatum (43.75%)
• Gomesa varicosa (31.25%)  section: Synsepala 
• Gomesa flexuosa (25.00%)  section: Synsepala