Labidous, Section (Malaxideae)
Latouria, Section (Dendrobium)
Lectandra, Genus – synonym of Poaephyllum, Genus
Lemniscoa, Genus – synonym of Bulbophyllum, Genus
Leopardanthus, Genus – synonym of Dipodium, Genus
Lepanthanthe, Section (Bulbophyllum)
Lepanthanthe, Genus – synonym of Bulbophyllum, Genus
Lepanthanthe, Genus – synonym of Lepanthanthe, Section (Bulbophyllum)
Lepidorhiza, Section (Bulbophyllum)
Leptopus, Section – synonym of Polymeres, Section (Bulbophyllum)
Leptorchis, Genus – synonym of Liparis, Genus
Leptorkis, Genus – synonym of Liparis, Genus
Leucorchis, Genus – synonym of Didymoplexis, Genus
Leucostachys, Genus – synonym of Goodyera, Genus
Limatodis, Genus – synonym of Calanthe, Genus
Limnas, Genus – synonym of Liparis, Genus
Limnorchis, Genus – synonym of Platanthera, Genus
Lindblomia, Genus – synonym of Platanthera, Genus
Linervia, Section (Nervilieae)
Linguella, Genus – synonym of Pterostylis, Genus
Lisowskia, Genus – synonym of Malaxis, Genus
Lissochilus, Genus – synonym of Eulophia, Genus
Loboglossum, Section (Taeniophyllum)
Lobogyne, Genus – synonym of Appendicula, Genus
Lyraea, Genus – synonym of Bulbophyllum, Genus
Lysias, Genus – synonym of Platanthera, Genus
Lysiella, Genus – synonym of Platanthera, Genus