The orchid Oncidesa Sum Lai Woh is a hybrid registered with the Royal Horticultural Society by S.T.C.Lee in 1980.
Top three species ancestors and their influences are

• Gomesa flexuosa (37.50%)  section: Synsepala 
• Gomesa varicosa (37.50%)  section: Synsepala 
• Oncidium sphacelatum (25.00%)