Short-Haired Lepanthes 
Short-leaved donkey orchid 
Showy Lady's Slipper 
Showy Orchis 
Sigmatostalix picturatissima 
Sigmatostalix sergii 
Silky blue orchid 
Single-Winged Lepanthes 
Sinuous Lepanthes 
Six Footed Lepanthes 
slender bog orchid 
Slender Forest Orchid 
Slender hyacinth orchid 
Slender purple donkey orchid 
Slender-spire orchid 
Small Beard Pleurothallis 
Small green wood orchid 
Small mosquito orchid 
Small Sickle Greenhood 
Small Tongue-orchid 
Small-clubbed spider orchid 
Small-dotted Orchis 
Small-spotted Restrepia 
Small-white Orchid