R. californica may refer to:
- Rafinesquia californica, the California chicory or California plumeseed, a flowering plant species native to most of the southwestern United States as far north as Oregon and to Baja California in Mexico
- Rhamnus californica, the California buckthorn or coffeeberry, a plant species native to California and southwestern Oregon
- Rhynchospora californica, the California beaked-rush or California beaksedge, a plant species endemic to California
- Rosa californica, the California wild rose, a plant species native to California and Oregon
See also
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