- Ramalina reticulata
- Picture 1
- Picture 2
- Ranunculus californicus
- Picture 1
- Picture 2
- Raphanus sativus
- Picture 1
- Picture 2 (fruits)
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Rhamnus californica
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Rhamnus crocea
- Rhamnus ilicifolia
- Picture 1
- Picture 2
- Picture 3 (fruits)
- Rhus integrifolia
- Picture 1
- Picture 2
- Picture 3
- Picture 4 (berries)
- Rhus ovata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Rhus ovata leaves
- Rhus trilobata
- Picture 1
- Picture 2
- Rhus trilobata var. quinata
- Ribes amarum
- Picture 1
- Picture 2
- Picture 3 (fruits)
- Picture 4
- Picture 5 (berries)
- Ribes aureum
- Ribes californicum
- Ribes malvaceum
- Picture 1
- Picture 2 (berries)
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8 (Berries)
- Ribes speciosum
- Picture 1 (fruits)
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
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- Ricinis communis
- Picture 1
- Picture 2
- Picture 3
- Romneya coulteri
- Picture 1
- Picture 2 (fruits)
- Picture 3
- Romneya trichocalyx
- Picture 1
- Picture 2
- Rorippa nasturtium-aquaticum
- Picture 1
- Picture 2
- Picture 3
- Rosa californica
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Rosa minutifolia
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3
- Picture 4
- Picture 5
- Rosa spithamea
- Picture 1
- Picture 2
- Rubus discolor
- Picture 1
- Picture 2
- Picture 3
- Rubus ursinus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Rumex acetosella
- Picture 1
- Picture 2
- Rumex crispus
- Rumex hymenosepalus
- Rumex pulcher
- Rumex salicifolius
- Rupertia phyodes
- Picture 1
- Picture 2
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