Materia Medica by William Boericke
- RADIUM BROMATUM
- RANUNCULUS BULBOSUS
- RANUNCULUS SCELERATUS
- RAPHANUS SATIVUS
- RATANHIA PERUVIANA
- RHAMNUS CALIFORNICA
- RHEUM PALMATUM
- RHODIUM METALLICUM
- RHODODENDRON FERRUGINEUM
- RHUS AROMATICA
- RHUS GLABRA
- RHUS TOXICODENDRON
- RHUS VENENATA
- RICINUS COMMUNIS
- ROBINIA PSEUDACACIA
- ROSA DAMASCENA
- RUMEX CRISPUS
- RUTA GRAVEOLENS