San Francisco Bay Area Plant Encyclopedia
- Ribes aureum
- Ribes aureum v. gracillimum
- Ribes “Barrie Coate”
- Ribes “Christy Ridge”
- Ribes “Claremont”
- Ribes “Dancing Tassels”
- Ribes indecorum
- Ribes malvaceum
- Ribes nevadense
- Ribes “Ortega Beauty”
- Ribes roezlii var. cruentum
- Ribes sanguineum
- Ribes speciosum
- Ribes “Spring Showers”
- Ribes viburnifolium
- Ribes “White Icicle”
- Romneya coulteri
- Rosa minutifolia
- Rosularia platyphylla
- Rudbeckia californica
- Rudbeckia “Cherokee Sunset”
- Rudbeckia “Prairie Sun”
- Ruellia “Katie Purple”
- Ruellia makoyana
- Rumohra adiantiformis
- Rumohra adiantiformis “Iberia”
- Ruschia karrooica
- Ruschia pulvinaris
- Ruschia uncinata
- Russelia equisetiformis