1. California herb with white conic or bell-shaped flowers usually tinged with green
   - white fritillary

Type of: checkered lily [US], fritillary

• genus Romneya
• genus Roridula
• genus Rorippa
• genus Rosa
• genus Rosellinia
• genus Rosmarinus
• genus Roystonea
• genus Rubia
• genus Rubus
• genus Rudbeckia
• genus Rumex
• genus Rumohra
• genus Rupicapra
• genus Rupicola
• genus Ruptiliocarpon
• genus Ruscus
• genus Russula
• genus Ruta
• genus Rutilus
• genus Rynchops
• genus Rypticus
• genus Sabal
• genus Sabbatia
• genus Sabinea
• genus Saccharomyces