1. Mat-forming perennial found in cold springs of the eastern United States
   - American watercress, Cardamine rotundifolia

Type of: watercress

• Sistine Chapel
• sistrum
• Sistrurus
• Sistrurus catenatus
• Sistrurus miliaris
• Siswati
• Sisymbrium barbarea
• Sisymbrium officinale
• Sisymbrium tanacetifolia
• Sisyphean
• Sisyphus
• Sisyridae
• Sisyrinchium
• sit
• sit around
• sit back
• sit by
• sit out
• sit pretty
• sit tight
• sit-down
• sit-down strike
• sit-in
• sit-up
• Sita