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

Type of: watercress

• silica
• silica gel
• silicate
• siliceous
• silicic
• silicic acid
• silicide
• silicification
• silicify
• silicious
• silicle
• silicon
• silicon bronze
• silicon carbide
• silicon chip
• silicon dioxide
• silicon oxide
• Silicon Valley
• silicone
• silicone polymer
• silicone resin
• silicone rubber
• silicosis
• siliqua
• silique