| Name | Accession number | Synonym | Species | Habit | Locality |
|---|---|---|---|---|---|
| CROC-1 | CD-20626-6M-2Y-1M-0Y[2964]; | TR.DR | S | MEX | |
| CROCKETT | K-44394; CI-12702; | TX-237-46-22[1318]; TEXAS-237-46-22[1112]; | TR.AE | W | USA:Texas |
| CROCKETT-70 | TR.AE | W | USA | ||
| CROCUS | PI-606243 | GP-560[2541]; | TR.AE | S | CAN:Saskatchewan |
| CRODUR | TR.DR | W | HRV | ||
| CROESUS | K-35690; CI-10076; PI-192324; AUS-17941 | TR.AE | S | CAN:Saskatchewan | |
| CROFTER | NSL-90-0087[2538]; | TR.AE | W | GBR | |
| CROISEMENT-221 | K-25079 | TR.AE | W | CHE | |
| CROISEMENT-245 | K-25082 | TR.AE | W | CHE | |
| CROISEMENT-248 | K-25083 | TR.AE | W | CHE | |
| CROISEMENT-268 | K-25085 | TR.AE | W | CHE | |
| CROMARTY | TR.AE | W | GBR | ||
| CROMWELL | PI-653527 | MN-00261-4[2965]; | TR.AE | S | USA:Minnesota |
| CRONOX | DON-MARIO-CRONOX[4205]; D.M.CRONOX[4333]; | TR.AE | S | ARG | |
| CRONUS | NORD-00-7518-L-1[4136]; | TR.SE | W | DEU | |
| CRONY | TR.AE | AUS:New-South-Wales | |||
| CROOKNECK-CLUB | BIG-CLUB[39][1110]; | TR.CO | S | USA | |
| CROSBILL | TR.AE | S | MEX | ||
| CROSBY | K-50998; CI-17282; | D-6715[1318]; DT-233[1323]; | TR.DR | S | USA:North-Dakota |
| CROSS | TR.AE | NZL |