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Rorippa Amphibia
- perennial herb found on streams and riversides throughout Europe except extreme north and Mediterranean; sometimes placed in genus Nasturtium
Roman Wormwood
- glaucous herb of northeastern United States and Canada having loose racemes of yellow-tipped pink flowers; sometimes placed in genus Fumaria
- European wormwood; minor source of absinthe
Romneya Coulteri
- tall branching subshrub of California and Mexico often cultivated for its silvery-blue foliage and large fragrant white flowers
Raoulia Lutescens
- perennial prostrate mat-forming herb with hoary woolly foliage
Raoulia Australis
- perennial prostrate mat-forming herb with hoary woolly foliage
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; 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 Manglesii
- Australian annual everlasting having light pink nodding flower heads; sometimes placed in genus Helipterum
Rudbeckia Hirta
- the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays