| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| CRR,2 | CARRERA[1765] | TR.AE | S | CHL |
| CRR,1 | CIMARRON[1281]; | TR.AE | W | USA |
| CRT | CARTHAGE[114][144][900][1281]; | TR.AE | S | TUN |
| CRTNA | CRISTINA[144][1281]; | TR.AE | S | MEX |
| CS | CHINESE-SPRING[900][1281]; | TR.AE | S | CHN |
| CSI | CHASICO-INTA[145][144][900][1281]; | TR.AE | I | ARG |
| CSO | CRESO[900][1281]; | TR.DR | S | ITA |
| CTA,1 | CENTEIRA[145][900][1765]; | TR.AE | S | BRA |
| CTA,2 | CELTA[115]; | TR.DR | S | PRT |
| CTAL | COMTAL | TR.AE | W | FRA:RAGT |
| CTCO,2 | CASTICO[115]; | TR.DR | S | PRT |
| CTE,1 | COMBATE[145] | TR.AE | S | BRA |
| CTFN | CENTRIFEN[145][144][900][1281]; | TR.AE | S | CHL,MEX |
| CTH | CANTHATCH[900][1281]; | TR.AE | S | CAN:MANITOBA |
| CTK | CENTURK[219][900][1281]; | TR.AE | W | USA:NEBRASKA |
| CTN | CARLETON[900][1281]; | TR.DR | S | USA |
| CTO | CINTO[114][144][900][1281]; | TR.AE | S | MEX |
| CTR,1 | CENTEIRA[145] | TR.AE | S | BRA |
| CTR,2 | CENTENARIO,URY[145] | TR.AE | S | URY |
| CTR,3 | CENTENARIO,BRA[145][900][1281]; | TR.AE | S | BRA |