The orchid Paphiopedilum Green Horizon is a hybrid registered with the Royal Horticultural Society by Orchid Zone in 1993. It is originated by T.Root
Top three species ancestors and their influences are

• Paphiopedilum philippinense (50.00%)  subgenus Polyantha  section: Mastigopetalum 
• Paphiopedilum sukhakulii (25.00%)  subgenus Sigmatopetalum  section: Planipetalum 
• Paphiopedilum callosum (12.50%)  subgenus Sigmatopetalum  subsection: Barbata