| Abbreviation | Definition |
|---|---|
| QBG | Queens Botanical Garden |
| QBG | Queen's Botanical Garden |
| QBI | Quality Botanical Ingredients |
| QBT | Quail Botanical Tour |
| QFP | Quality Flower Product |
| QM | Quilted Maple |
| R | Rose |
| R | Rumex |
| RARE | Rooted And Reaching Everywhere |
| RBE | Relative Biological Effectiveness |
| RBG | Royal Botanical Gardens |
| RBGE | Royal Botanic Garden Edinburgh |
| RBGM | Royal Botanic Gardens Melbourne |
| RC | Ring Count |
| RDF | Really Dense Forest |
| RGR | Relative Growth Rate |
| RIBR | RIbes BRacteosum (stink currant) |
| RIBR2 | RIchardia BRasiliensis (tropical Mexican clover) |
| RIBR3 | RInodina BRouardii (Brouard's rinodina lichen) |
| RIBW | Ribwort |