Oak
Olive
Omega Flax
Onyx
Opal
Oregano
Oryza sativa
Padparadschah
Pearl
Pepper
Peridot
Piss-A-Bed
Prickly Broom
Quartz
Raspberryspar
Rattleweed
Rauwolfia
Red Clover
Red Coral
Rhodochrosite
Rhododendron
Rhodonite
Rhubarb
Robin-Run-In-The-Hedge
Rose Quartz
Rosemary
Rubellite
Ruby
Rudbeckia
Rue
Run-By-The-Ground