Rigid Blue Yucca 
Rush Fringe-Lily 
Rush Lily 
Safed Musli 
Sand-dune Fringed Lily 
Scented Solomon's-Seal 
Scilla cilicica 
Scilla hyancinthoides 
Scilla libanotica 
Scilla ramburei 
Scilla rosenii 
Sea Squill 
Siberian squill 
Slender Palm Lily 
Smooth agave 
Smooth Solomon's seal 
Smooth Sotol 
Snake Plant 
Soaptree yucca 
Solomon's seal 
South Indian squill 
Spanish bluebell 
Spanish dagger 
Spanish-bayonet