The orchid Cattleya Alexandra is a hybrid registered with the Royal Horticultural Society by Black & Flory in 1916.
Top three species ancestors and their influences are

• Cattleya warscewiczii (50.00%)  subgenus Cattleya  section: Cattleya 
• Cattleya lueddemanniana (25.00%)  subgenus Cattleya  section: Cattleya   series: Lawrenceanae 
• Cattleya dowiana (25.00%)  subgenus Cattleya  section: Cattleya