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Ratibida Columnaris
- coneflower with flower heads resembling a Mexican hat with a tall red-brown disk and drooping yellow or yellow and red-brown rays; grows in the great plains along base of Rocky Mountains
Ratibida Columnifera
- plant similar to the Mexican hat coneflower; from British Columbia to New Mexico
Ratibida Tagetes
- coneflower of central to southwestern United States
Rhodanthe
- Australian annual everlasting having light pink nodding flower heads; sometimes placed in genus Helipterum
Rhodanthes
- Australian annual everlasting having light pink nodding flower heads; sometimes placed in genus Helipterum
Rhodanthe Manglesii
- Australian annual everlasting having light pink nodding flower heads; sometimes placed in genus Helipterum
Rudbeckia
- North American perennial herbs with showy cone-shaped flower heads
Rudbeckia Hirta
- the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays
Rudbeckia Serotina
- the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays
Rudbeckia Laciniata
- tall leafy plant with erect branches ending in large yellow flower heads with downward-arching rays; grow in Rocky Mountains south to Arizona and east to the Atlantic coast