| Name | Accession number | Synonym | Species | Habit | Locality |
|---|---|---|---|---|---|
| UNIE-52-A | K-45391 | UNION-52-A[000]; | TR.AE | S | ZAF |
| UNIE-54 | TR.AE | S | ZAF | ||
| UNIE-57 | K-60336 | TR.AE | S | ZAF | |
| UNIKUM | TR.DR | W | RUS:Krasnodar | ||
| UNION | K-25549; CI-11704; AUS-3483 | TR.CO | S | AUS:New-South-Wales | |
| UNITY | AC-UNITY-VB[4053]; UNITY-VB[000]; UNITY-GC[4312]; 97-B-64-F-9-A-3[3726][3961]; BW-362[3961]; | TR.AE | S | CAN:Manitoba | |
| UNIVERS-1 | TR.AE | W,I | ALB | ||
| UNIVERS-2 | TR.AE | W,I | ALB | ||
| UNIVERSAAL | K-43647; EST-00420 | TR.AE | W | EST | |
| UNIVERSAL | LGW-72[4136]; | TR.AE | W | GBR | |
| UNIVERSITY-GEM | SURPRISE[39][1110]; | TR.AE | S | USA | |
| UNIYA | K-64726 | LEUCURUM-1699-h-94[1371]; | TR.DR | W | RUS:Krasnodar |
| UNMEDPUR-MUMMY | K-40300 | TR.TG | W | EGY | |
| UNNAT-HALNA | K-9423[4191]; | TR.AE | S | IND | |
| UNNATH-C-306 | IMPROVED-C-306[1498]; UNNAT-C-306[3264]; | TR.AE | S | IND:Wellington | |
| UNNATH-KALYANSONA | UNNATH-KALYAN-SONA[2627]; HW-2002[2809][3080]; | TR.AE | S | IND | |
| UNNATH-SONALIKA | HW-2001[2809]; | TR.AE | S | IND | |
| UNRRA | K-41358 | U.N.R.R.A.[52]; UN-RRA[64]; | TR.AE | S | USA |
| UNTER-ENGADIN | TR.AE | W | CHE | ||
| UNTERFRANKISCHER-LAND | T-11246; | TR.AE | W | DEU |