The orchid Phalaenopsis Sierra Gold is a hybrid registered with the Royal Horticultural Society by Carriage Hill Farm in 1979. It is originated by Rex D.Smith
Top three species ancestors and their influences are

• Phalaenopsis amboinensis (50.00%)  subgenus Polychilos  section: Amboinenses 
• Phalaenopsis amabilis (25.00%)
• Phalaenopsis mannii (25.00%)