The orchid Zygolum Louisendorf grex is a hybrid in the Zygolum genus. registered with the Royal Horticultural Society by Glicenstein/Hoosier in 2004. It is originated by B.Holm Registered parents are Zygosepalum labiosum × Zygopetalum Artur Elle. The key influencing species of this hybrid are No items in the list. listed in order of their genetic contribution.