1. Minute rootless aquatic herbs having flat fronds floating on or below the water surface and bearing 1-2 flowers per frond; America and Africa
   - genus Wolffiella

Type of: liliopsid genus, monocot genus

Part of: duckweed family, family Lemnaceae, Lemnaceae

• Russo-Japanese War
• Russula
• Russulaceae
• rust
• rust fungus
• rust inhibitor
• rust mite
• rust-brown
• rust-colored
• rust-coloured
• rust-free
• rust-red
• rust-resistant
• Rustbelt
• rusted
• rustic
• rusticate
• rustication
• rusticism
• rusticity
• rustily
• rustiness
• rusting
• rustle
• rustler