The orchid Dendrobium Gracia Lewis is a hybrid registered with the Royal Horticultural Society by Mrs Gracia Lewis in 1950.
Top three species ancestors and their influences are

• Dendrobium macrophyllum (50.00%)
• Dendrobium bigibbum (25.00%)  section: Phalaenanthe 
• Dendrobium discolor (25.00%)  section: Spatulata