| Accepted Latin Names | Common Name | In Kent? | Type | Kent ref. | Status | Authority | Record No. |
|---|---|---|---|---|---|---|---|
| Ugni molinae | Chilean Guava | Yes S2 | A1 | 83--UGN--mol | Turcz. | 0920005584 | |
| Ulex europaeus | Gorse | Page 95 | A1 | 77--26--1 | N | L. | 0920002112 |
| Ulex europaeus x gallii | Yes | A1 | 77--26--1 x 2 | N | 0920002700 | ||
| Ulex gallii | Western Gorse | Page 95 | A1 | 77--26--2 | N | Planch. | 0920002113 |
| Ulex gallii x minor | Yes S2 | A1 | 77--26--2 x 3 | ||||
| Ulex minor | Dwarf Gorse | Page 95 | A1 | 77--26--3 | N | Roth | 0920002114 |
| Ulmus glabra | Wych Elm | Page 95 | A1 | 33--1--1 | N | Huds. | 0920002119 |
| Ulmus glabra subsp. glabra | Yes | A1 | 33--1--1--a | 0920002119.1 | |||
| Ulmus glabra subsp. montana | Yes | A1 | 33--1--1--b | Hyl. | 0920002119.2 | ||
| Ulmus glabra x minor = U. x vegeta | Huntingdon Elm | Yes | A1 | 33--1--1 x 3 | N | (Loudon) Ley | 0920002124 |
| Ulmus glabra x minor x plotii = U. x hollandica | Dutch Elm | Yes | A1 | 33--1--1 x 3 x 4 | N | Mill. | 0920002120 |
| Ulmus glabra x plotii = U. ? x elegantissima | Yes | A1 | 33--1--1 x 4 | N | Horw. | 0920002118 | |
| Ulmus glabra x procera | Yes | A1 | 33--1--1 x 2 | 0920007655 | |||
| Ulmus laevis | European White-elm | Yes S1 | A1 | 33--1--lae | Ne | Pall. | 0920003579 |
| Ulmus minor | Page 95 | A1 | 33--1--3 | N | Mill. | 0920002115 | |
| Ulmus minor agg. | Aggregate | AK | 33--1--- | ||||
| Ulmus minor subsp. angustifolia | Cornish Elm | Yes | A1 | 33--1--3--b | (Weston) Stace | 0920002123 | |
| Ulmus minor subsp. minor | Small-leaved Elm | Yes | A1 | 33--1--3--a | 0920005484 | ||
| Ulmus minor subsp. sarniensis | Jersey Elm | Yes | A1 | 33--1--3--c | (C.K. Schneid.) Stace | 0920005485 | |
| Ulmus minor x plotii = U. x viminalis | Yes | A1 | 33--1--3 x 4 | Lodd. ex Loudon | 0920007658 | ||
| Ulmus plotii | Plot's Elm | Yes | A1 | 33--1--4 | N | Druce | 0920002121 |
| Ulmus procera | English Elm | Page 95 | A1 | 33--1--2 | ?N | Salisb. | 0920002122 |
| Ulmus procera x minor | Yes | A1 | 33--1--2 x 3 | 0920007656 | |||
| Ulmus procera x plotii | Yes | A1 | 33--1--2 x 4 | 0920007657 | |||
| Ulmus thomasii | Rock Elm | Clement | A3 | 33--1--tho | Sarg. | 0920008997 | |
| Umbellularia californica | Californian Bay | Clement | A3 | 24--UMB--cal | (Hook. & Arn.) Nutt. | 0920008998 | |
| Umbilicus rupestris | Navelwort | Page 95 | A1 | 73--2--1 | N | (Salisb.) Dandy | 0920002125 |
| Urocarpidium peruvianum | Scabrous Mallow | Clement | A3 | 53--URO--per | (L.) Krapov. | 0920008999 | |
| Urocarpidium shepardiae | Clement | A3 | 53--URO--she | (I.M. Johnst.) Krapov. | 0920009000 | ||
| Urochloa panicoides | Sharp-flowered Signal-grass | Stace | A2 | 153--URO--pan | Ca | P. Beauv. | 0920003291 |
| Urospermum dalechampii | Clement | A3 | 135--URO--dal | (L.) Scop. ex F.W. Schmidt | 0920005585 | ||
| Urospermum picroides | Clement | A3 | 135--URO--pic | (L.) Scop. ex F.W. Schmidt | 0920009001 | ||
| Urtica dioica | Common Nettle | Page 95 | A1 | 36--1--1 | N | L. | 0920002126 |
| Urtica dioica subsp. dioica | Yes S2 | A1 | 36--1--1--a | ||||
| Urtica dioica subsp. galeopsifolia | Yes S2 | A1 | 36--1--1--b | (Wierzb. ex Opiz) Chrtek | |||
| Urtica flabellata | Clement | A3 | 36--1--fla | Kunth | 0920009002 | ||
| Urtica incisa | Scrub Nettle | Clement | A3 | 36--1--inc | Poir. | 0920008267 | |
| Urtica massaica | Clement | A3 | 36--1--mas | Mildbr. | 0920009003 | ||
| Urtica pilulifera | Roman Nettle | Clement | A3 | 36--1--pil | L. | 0920002127 | |
| Urtica urens | Small Nettle | Page 95 | A1 | 36--1--2 | Ar | L. | 0920002128 |
| Utricularia australis | Bladderwort | Yes | A1 | 128--2--2 | N | R. Br. | 0920002131 |
| Utricularia intermedia | Intermediate Bladderwort | Yes | A1 | 128--2--3 | N | Hayne | 0920004333 |
| Utricularia intermedia agg. | Aggregate | AK | 128--2--- | ||||
| Utricularia minor | Lesser Bladderwort | Yes | A1 | 128--2--6 | N | L. | 0920002130 |
| Utricularia ochroleuca | Pale Bladderwort | Yes | A1 | 128--2--5 | R.W. Hartm. | 0920004334 | |
| Utricularia stygia | Nordic Bladderwort | Yes | A1 | 128--2--4 | G. Thor | 0920004335 | |
| Utricularia vulgaris | Greater Bladderwort | Yes | A1 | 128--2--1 | N | L. | 0920002133 |
| Utricularia vulgaris agg. | Aggregate | AK | 128--2--- |