The orchid Paphiopedilum Mellow Yellow is a hybrid registered with the Royal Horticultural Society by M.Tibbs in 2020.
Top three species ancestors and their influences are

• Paphiopedilum emersonii (50.00%)  subgenus Parvisepalum  section: Emersonianum 
• Paphiopedilum primulinum (25.00%)  subgenus Cochlopetalum
• Paphiopedilum armeniacum (25.00%)  subgenus Parvisepalum