| 819 | ULTRA ECHO | Rich 1972 | BB | 24 | M,Re | Bitone | S:medium blue, F:medium violet, B:yellow | 3.00 |
| 1162 | UNDERSTUDY | Tompkins 1986 | TB | 38 | ML | Plicata | Creamy orchid-blue ground, washed deep heliotrope blue, 1/2" violet edge, B:blue | 8.00 |
| 2425 | UNFURLED FLAG | Hager 1982/83 | TB | 36 | M | Self | S:none, F:six blue violet, B:white tipped yellow | 7.00 |
| 189 | UNICORN | Austin 1952/54 | TB | 36 | EM | Plicata | S:bright mulberry, F:white, mulberry edge and centerline, B:superimposed upon a 3/4" horn; Collector's item, first horned iris | 4.00 |
| 532 | UP PERISCOPE | Maryott 1984 | TB | 36 | E-M | Self | Ruffled medium blue, thin band of silver around F, small flash of white at end of white B, which is yellow deep in throat | 7.00 |