1. Tall tree of Queensland and New South Wales and Victoria
   - forest red gum

Type of: flooded gum

• genus Sphyraena
• genus Sphyrapicus
• genus Sphyrna
• genus Spilogale
• genus Spinacia
• genus Spinus
• genus Spiraea
• genus Spiranthes
• genus Spirillum
• genus Spirochaeta
• genus Spirodela
• genus Spirogyra
• genus Spirula
• genus Spizella
• genus Spodoptera
• genus Spondias
• genus Sporobolus
• genus Spraguea
• genus Spyeria
• genus Squalus
• genus Squatina
• genus Squilla
• genus Stachys
• genus Stanhopea
• genus Stanleya