| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| RRT | RUST-RESISTANT-TRIUMPH[1112][1281]; | TR.AE | USA | |
| RUSTAN | RUSTAND[3692]; | TR.DR | S | MEX |
| ROLA1 | RUSTICOLA-1[1281]; | TR.DR | S | MEX |
| ROLA2 | RUSTICOLA-2[1281]; | TR.DR | S | MEX |
| ROLA3 | RUSTICOLA-3[1281]; | TR.DR | S | MEX |
| ROLA4 | RUSTICOLA-4[1281]; | TR.DR | S | MEX |
| ROLA5 | RUSTICOLA-5[1281]; | TR.DR | S | MEX |
| ROLA6 | RUSTICOLA-6[1281]; | TR.DR | S | MEX |
| ROLA7 | RUSTICOLA-7[1281]; | TR.DR | S | MEX |
| ROLA8 | RUSTICOLA-8[1281]; | TR.DR | S | MEX |
| ROLA9 | RUSTICOLA-9[1281]; | TR.DR | S | MEX |
| ROLA | RUSTICOLA[3692]; | TR.DR | S | MEX |
| RW3016 | RW-3016[1281][1324]; | TR.AE | S | IND |
| RW346 | RW-346[1281][1324]; | TR.AE | S | IND |
| RYE | RYE[1281]; | TR.AE | ||
| RYPS1 | RYNCHOPS-1[1281]; | TR.DR | S | MEX |
| RYPS2 | RYNCHOPS-2[1281]; | TR.DR | S | MEX |
| RST | RYSTING[1281]; | TR.AE | USA | |
| S10B3 | S-10-B3[1281]; | TR.AE | SWE | |
| S12 | S-12[1281]; | TR.AE | S | BRA |