| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| RDN-E | REDMAN,GBR[1281]; | TR.AE | GBR | |
| RMD | REDMOND[1281]; | TR.AE | USA | |
| RDW | REDWIN[1281]; | TR.AE | USA | |
| RG | REGAL[1281]; | TR.AE | USA | |
| RGN | REGENT[1281]; | TR.AE | CAN | |
| RBCE1 | REICHENBACHII-ENANO-1[1281]; | TR.DR | S | MEX |
| RBCE2 | REICHENBACHII-ENANO-2[1281]; | TR.DR | S | MEX |
| RBCE | REICHENBACHII-ENANO[1281]; | TR.DR | S | MEX |
| RCHG39 | REICHERSBERG-39[1281]; | TR.AE | AUT | |
| RCHG42 | REICHERSBERG-42[1281]; | TR.AE | AUT | |
| REID1 | REIDORA-1[1281]; | TR.DR | S | MEX |
| REID2 | REIDORA-2[1281]; | TR.DR | S | MEX |
| REID | REIDORA[3692]; | TR.DR | S | MEX |
| RHUE | REIHUE-INIA[1281]; | TR.AE | CHL | |
| RLN | RELIANT[1281]; | TR.AE | USA | |
| RLF | RELIEF[1281]; | TR.AE | USA | |
| REM | REMIENS[1281]; | TR.AE | ||
| RMOS | REMOIS[1281]; | TR.AE | FRA | |
| RNRD | RENARD[1281]; | TR.AE | GBR | |
| RDV | RENDEZVOUS[1281]; | TR.AE | GBR |