| Ra is for ranales, raffia palm and ravel out. |
| Rb is for rbc. |
| Rc is for rcmp. |
| Re is for regenerate. |
| Rf is for rf. |
| Rh is for rhincodon. |
| Ri is for risk taker. |
| Rn is for rna. |
| Ro is for rorippa and roccellaceae. |
| Rp is for rpm. |
| Rt is for rtlt. |
| Ru is for rutaceae and run-down. |
| Rv is for rv. |
| Rw is for rwandese republic. |
| Ry is for rydberg unit, rya and rynchops. |
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