San Francisco Bay Area Plant Encyclopedia
- Quiabentia verticillata
- Rabiea difformis
- Ranunculus californicus
- Raoulia australis
- Raphionacme flanaganii
- Rebutia arenacea
- Rebutia donaldiana
- Rebutia fabrisii
- Rebutia fiebrigii
- Rebutia fulviseta
- Rebutia heliosa
- Rebutia heliosa v. melanistic
- Rebutia kupperiana
- Rebutia marsoneri
- Rebutia mentosa
- Rebutia minuscula
- Rebutia narvaecensis
- Rebutia neocumingii ssp. trollii
- Rebutia perplexa
- Rebutia pulvinosa
- Rebutia pygmaea
- Rebutia “Sunrise”
- Restio multiflorus
- Restio quadratus
- Restio tetraphyllus
- Rhaphidophora decursiva
- Rhaphidophora hayi
- Rhaphidophora tetrasperma
- Rhipsalis baccifera
- Rhipsalis baccifera ssp. horrida