The orchid Cymbidium Lillian Stewart is a hybrid registered with the Royal Horticultural Society by Stewart Inc. in 1955.
Top three species ancestors and their influences are

• Cymbidium insigne (46.88%)  section: Cyperorchis 
• Cymbidium lowianum (15.63%)  section: Cyperorchis 
• Cymbidium eburneum (12.50%)  section: Cyperorchis