The orchid Cattleya Glenarun is a hybrid registered with the Royal Horticultural Society by S.Low in 1950.
Top three species ancestors and their influences are

• Cattleya tenebrosa (50.00%)  subgenus Crispae  section: Crispae   series: Cattleyodes 
• Cattleya dowiana (25.00%)  subgenus Cattleya  section: Cattleya 
• Cattleya rex (25.00%)  subgenus Cattleya  section: Cattleya