| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| CORNU | CORNUDA[1281]; | TR.DR | S | MEX |
| E88056 | CORRAL[1281]; | TR.DR | FRA | |
| COPS | COTURNICOPS[1281]; | TR.DR | S | MEX |
| CNY | COURTNEY[1281]; | TR.AE | USA | |
| CP2801 | CP-2801[1281]; | TR.AE | ||
| CPT8 | CPT-8[1281]; | TR.DR | S | CHL |
| CR38 | CR-38[1281]; | TR.AE | S | IND |
| CR40 | CR-40[1281]; | TR.AE | S | IND |
| CR45 | CR-45[1281]; | TR.AE | S | IND |
| CR5 | CR-5[1281]; | TR.AE | ||
| CFM | CRAFTSMAN[1281]; | TR.AE | GBR | |
| CRECCA | CRECCA[1281]; | TR.DR | S | MEX |
| CR63 | CRESPO-63[1281]; | TR.AE | S | COL |
| CRISP | CRISPUS[1281]; | TR.DR | S | MEX |
| CDECH | CRISTALINO-DE-CHILE[1281]; | TR.DR | S | CHL |
| CRISTA | CRISTATA[3692]; | TR.DR | S | MEX |
| CROC1 | CROC-1[1281]; | TR.DR | S | MEX |
| CROC2 | CROC-2[1281]; | TR.DR | S | MEX |
| CROC3 | CROC-3[1281]; | TR.DR | S | MEX |
| CROSS7 | CROSS-7[1281]; | TR.AE | NZL |