| Name | Accession number | Synonym | Species | Habit | Locality |
|---|---|---|---|---|---|
| ORANIE | TR.AE | W | |||
| ORANIENBAUMSKAYA | K-38319 | TR.AE | W | RUS:Sankt-Peterburg | |
| ORANJE | TR.AE | S | ZAF | ||
| ORANVILLE | RICP-01C0106496 | TR.AE | W | FRA | |
| ORASANKA | K-58336 | KG-ORASANKA[3184]; | TR.AE | W | YUG:Serbia |
| ORATOR | RICP-01C0107328 | TR.AE | W | FRA | |
| ORATORIO | ERGE-4925 | TR.AE | W | FRA | |
| ORBA | TR.AE | CHL | |||
| OR-BIDAI | K-40756 | TR.AE | S | CHN | |
| ORBIS | K-64063; AUS-24283 | TR.AE | W | DEU | |
| ORBIT | AFRC-10055 | CPBT-W-156[4136]; | TR.AE | W | GBR |
| ORBITA | K-48686; PI-418573; AFRC-2224; AFRC-3622 | DNEPROVSKAYA-679[18]; | TR.AE | W | UKR:Dnepropetrovsk |
| ORBITAL | TR.SE | W | FRA | ||
| ORCA | K-45150; PI-297327; PI-315838; AFRC-56 | MGH-5014[000]; | TR.AE | S | NLD |
| ORCANO | VHD-010-73[221]; | TR.AE | W | SWE | |
| ORCF-101 | OR-2010051[3413][3556]; OWW-72339[3556]; | TR.AE | W | USA:Oregon | |
| ORCF-102 | OR-201007[3413]; OR-2010007[3556]; | TR.AE | W | USA:Oregon | |
| ORCF-103 | ORI-2042037[4006]; | TR.AE | W | USA:Oregon | |
| ORCHESTRE | TR.AE | W | FRA | ||
| ORDA | CTWS-93-Y-00012-S[3012]; CTWS-93-Y-00012-S-2WM-0WM-0WM[4079]ZH; | TR.SE | I | KAZ |