R
- Rocky Mountains (21)
- Rock (139)
- Root formation (3)
- Roots (Botany) (11)
- Rosa carolina (1)
- Rosa palustris (1)
- Rosa (3)
- Rose of Plymouth (1)
- Rosebush Falls (1)
- Roses (2)
- Rose (5)
- Rosinweed (4)
- Rotoskey (1)
- Round Leaf Thimbleweed (1)
- Rowley Bay (2)
- Royal Palm (3)
- Royal Presidio Chapel (1)
- Roystonea (3)
- Rubel, Eduard, 1876-1960 (2)
- Rubus parviflorus (1)
- Rudbeckia hirta (2)
- Rudbeckia laciniata (1)
- Rumex (6)
- Running Ground Pine (2)
- Running Service Berry (2)
- Rush Skeleton Plant (1)
- Rush (11)
- Russell, Ruth (1)
- Russian Thistle (3)
- Ruxton Canyon (2)