Scilla libanotica 
Scilla ramburei 
Scilla rosenii 
Sea daffodil 
Sea Squill 
Serapias cordigera 
Serapias levantina 
Serapias orientalis 
Serapias strictiflora 
Sertifera purpurea 
Shining Ladies' Tresses 
Short Purple-Flag 
Short-Haired Lepanthes 
Short-leaved donkey orchid 
Showy Lady's Slipper 
Showy Orchis 
Siberian iris 
Siberian lily 
Siberian squill 
Sigmatostalix picturatissima 
Sigmatostalix sergii 
Silky blue orchid 
Single-Winged Lepanthes 
Sinuous Lepanthes