The orchid Paphiopedilum William Trelease is a hybrid in the Paphiopedilum genus. registered with the Royal Horticultural Society by Sanders[St Albans] in 1898. Registered parents are Paphiopedilum parishii × Paphiopedilum rothschildianum. The key influencing species of this hybrid are No items in the list. listed in order of their genetic contribution.