1. Trillium of central United States having dark purple sessile flowers
   - prairie wake-robin, prairie trillium

Type of: trillium, wake-robin, wood lily

• rowlock
• rowlock arch
• Roy Chapman Andrews
• Roy Lichtenstein
• Roy Orbison
• Roy Wilkins
• royal
• Royal Academy
• Royal Academy of Arts
• royal agaric
• Royal Air Force
• royal blue
• royal brace
• Royal Canadian Mounted Police
• royal casino
• royal charter
• royal court
• royal family
• royal fern
• royal flush
• royal house
• royal icing
• royal jelly
• royal line
• royal mast