1. Perennial of southeastern United States having usually blue flowers
   - Short's aster

Type of: aster

• Roquefort dressing
• roquelaure
• roquet
• roquette
• roridula
• Roridulaceae
• Rorippa
• Rorippa amphibia
• Rorippa islandica
• Rorippa nasturtium-aquaticum
• rorqual
• Rorschach
• Rorschach test
• rort
• Rosa
• Rosa banksia
• Rosa canina
• Rosa chinensis
• Rosa damascena
• Rosa eglanteria
• Rosa laevigata
• Rosa Melba Ponselle
• Rosa moschata
• Rosa multiflora
• Rosa odorata