• Species and lower taxa
• Higher taxa
• Common names

Saccoglossum, Genus

Saccoglossum, Genus – synonym of Bulbophyllum, Genus

Saccoglossum, Genus – synonym of Codonosiphon, Section (Bulbophyllum)

Saccolabiopsis, Genus

Salaccenses, Section (Habenaria)

Salacistis, Genus – synonym of Goodyera, Genus

Sarcanthopsis, Genus

Sarcanthus, Genus – synonym of Cleisostoma, Genus

Sarcocadetia, Section (Cadetia)

Sarcochilus, Genus

Satorkis, Genus – synonym of Habenaria, Genus

Saurocephalum, Section – synonym of Brachystachyae, Section (Bulbophyllum)

Saurolophorkis, Genus

Saurolophorkis, Genus – synonym of Malaxis, Genus

Schistopetalum, Section (Bulbophyllum)

Schlechteria, Section – synonym of Polymeres, Section (Bulbophyllum)

Schlechteria, Subgenus – synonym of Polymeres, Section (Bulbophyllum)

Schlechterorchis, Genus – synonym of Habenaria, Genus

Schoenomorphus, Genus – synonym of Tropidia, Genus

Schoenorchis, Genus

Scoliochilus, Genus – synonym of Appendicula, Genus

Scyphosepalum, Section – synonym of Monanthaparva, Section (Bulbophyllum)

Scytoxiphium, Section (Malaxideae)

sect. Pahudia – synonym of Beccariana, Section (Bulbophyllum)

Section Cycloglossum – synonym of Peltopus, Section (Bulbophyllum)

Section Distichophyllum – synonym of Distichophyllae, Section (Dendrobium)

Section Eu-Cadetia – synonym of Cadetia, Section (Cadetia)

Section Euphlebium – synonym of Fugacia, Section (Dendrobium)

Section Gibberanthera – synonym of Brachypus, Section (Bulbophyllum)

Section Hedyothyrsus – synonym of Macrouris, Section (Bulbophyllum)

Section Hymenobractea – synonym of Lepidorhiza, Section (Bulbophyllum)

Section Manobulbon – synonym of Uncifera, Section (Bulbophyllum)

Section Mekynosepalum – synonym of Diplocaulobium, Genus

Section Nematorhizis – synonym of Minutissima, Section (Bulbophyllum)

Section Pachyanthe – synonym of Intervallatae, Section (Bulbophyllum)

Section Platycaulon – synonym of Platycaulon, Section (Dendrobium)

Section Plicatiles – synonym of Flickingeria, Genus

Section Polyblepharon – synonym of Monanthes, Section (Bulbophyllum)

Section Pseudocadetia – synonym of Cadetia, Genus

Section Scyphosepalum – synonym of Monanthaparva, Section (Bulbophyllum)

Section Secunda – synonym of Pedilonum, Section (Dendrobium)

Section Stathmocaulos – synonym of Stachysanthes, Section (Bulbophyllum)

Section Stenochilus – synonym of Sestochilos, Section (Bulbophyllum)

Section Striata – synonym of Beccariana, Section (Bulbophyllum)

Section Trachyrhachis – synonym of Lepanthanthe, Section (Bulbophyllum)

Section Trachyrhizum – synonym of Brevisaccata, Section (Dendrobium)

Section Trachytheca – synonym of Latouria, Section (Dendrobium)

Section Vesicisepalum J.J.Sm., – synonym of Polymeres, Section (Bulbophyllum)

Section Virgatae – synonym of Crumenata, Section (Dendrobium)

Section Wallichii – synonym of Brachyantha, Section (Bulbophyllum)

Seidenfia, Genus – synonym of Malaxis, Genus

Senghasiella, Genus – synonym of Habenaria, Genus

Sepalocodon, Section (Taeniophyllum)

Sepalosiphon, Genus – synonym of Glomera, Genus

Serpenticaulis, Genus – synonym of Bulbophyllum, Genus

Serpenticaulis, Genus – synonym of Polymeres, Section (Bulbophyllum)

Sestochilos, Section (Bulbophyllum)

Singularybas, Genus – synonym of Corybas, Genus

Smithanthe, Genus – synonym of Habenaria, Genus

Spathoglottis, Genus

Spatulata, Section (Dendrobium)

Speciosae, Section (Coelogyne)

Speculantha, Genus – synonym of Pterostylis, Genus

Spilorchis, Genus – synonym of Bulbophyllum, Genus

Spiranthes, Genus

Spiranthinae, Subtribe

Stachysanthes, Section (Bulbophyllum)

Stachysanthes, Section – synonym of Stachysanthes, Section (Bulbophyllum)

Stamnorchis, Genus – synonym of Pterostylis, Genus

Stathmocaulos, Section – synonym of Stachysanthes, Section (Bulbophyllum)

Stauritis, Genus – synonym of Phalaenopsis, Genus

Staurochilus, Genus – synonym of Trichoglottis, Genus

Stauroglottis, Genus – synonym of Phalaenopsis, Genus

Stauropsis, Genus – synonym of Trichoglottis, Genus

Stellorkis, Genus – synonym of Nervilia, Genus

Stenochilus, Section – synonym of Sestochilos, Section (Bulbophyllum)

Stereosandra, Genus

Stichorchis, Genus – synonym of Liparis, Genus

Stichorkis, Genus – synonym of Liparis, Genus

Stictosepalum, Section – synonym of Beccariana, Section (Bulbophyllum)

Stigmatodactylus, Genus

Stimegas, Genus – synonym of Paphiopedilum, Genus

Strateuma, Genus – synonym of Zeuxine, Genus

Striata, Section – synonym of Beccariana, Section (Bulbophyllum)

Strongyle, Section (Dendrobium)

Strongyleria, Section (Eria)

Sturmia, Genus – synonym of Liparis, Genus

Styloglossum, Section (Calanthe)

Styloglossum, Genus – synonym of Calanthe, Genus

Subgenus Rhizobium – synonym of Rhizobium, Section (Dendrobium)

subgenus Strongyle – synonym of Strongyle, Section (Dendrobium)

Subsection Bigibba – synonym of Phalaenanthe, Section (Dendrobium)

Subsection Tridentifera – synonym of Grastidium, Section (Dendrobium)

Sunipia, Genus – synonym of Bulbophyllum, Genus

Synadena, Genus – synonym of Phalaenopsis, Genus

Synarmosepalum, Genus – synonym of Brachystachyae, Section (Bulbophyllum)

Synarmosepalum, Genus – synonym of Bulbophyllum, Genus

Synmeria, Genus – synonym of Habenaria, Genus

Synptera, Genus – synonym of Trichoglottis, Genus