| Name | Accession number | Synonym | Species | Habit | Locality |
|---|---|---|---|---|---|
| OCHROPUS | CD-84347[1281][3692]; | TR.DR | S | MEX | |
| OCHSENHAUFENER-BASTARD | K-39742; | OCHSENHAUSER-BASTARD[541]; | TR.AE | W | DEU |
| OCORONI-86 | K-60814; PI-591785 | OCORONI-F-86[144][1207]; CM-43598-II-8Y-1M-1Y-3M-3Y-0B-0MEX[144][706]; | TR.AE | S | MEX |
| OCORONI-86-R1 | CM-43598-II-8Y-1M-1Y-3M-3Y-0B-1B[1281]; CM-43598[1281]; | TR.AE | |||
| OCOTILLO | APB-D-8[3556]; | TR.DR | S | USA:Arizona | |
| OCTAL | PBIS-02-1019[4136]; | TR.AE | W | FRA | |
| OCTET | TR.AE | W | FRA | ||
| OCTOPUS | PBIS-99-66[4136]; | TR.AE | W | GBR | |
| OCW-00-M-538-S-1 | TR.AE | W | USA | ||
| OCW-00-M-538-S-2 | TR.AE | W | USA | ||
| OCW-00-M-55-2-S | TR.AE | W | USA | ||
| OCW-00-S-013-S | TR.AE | W | USA | ||
| OCW-00-S-063-S-1-B | TR.AE | W | USA | ||
| ODA,BLR | TR.AE | W | BLR | ||
| ODA,ETH | DZ-2227[3589]; | TR.DR | S | ETH | |
| ODALEVKA | K-36602 | TR.AE | W | KAZ | |
| ODA,POL | SMH-784[667][1075]; | TR.AE | W | POL | |
| ODA,YUG | TR.AE | W | YUG:Serbia | ||
| ODDER | 700-589-A[4136]; | TR.AE | W | DNK | |
| ODEON | K-59521; PI-491572; AFRC-7137 | TR.AE | W | BEL |