| Accepted Latin Names | Common Name | In Kent? | Type | Kent ref. | Status | Authority | Record No. |
|---|---|---|---|---|---|---|---|
| Ochagavia carnea | Tresco Rhodostachys | Yes | A1 | 156--2--1 | Ne | (Beer) L.B. Sm. & Looser | 0920007462 |
| Ochthodium aegyptiacum | Clement | A3 | 62--OCH--aeg | (L.) DC. | 0920007101 | ||
| Ocimum basilicum | Sweet Basil | Clement | A3 | 118--OCI--bas | L. | 0920007102 | |
| Ocimum micranthum | Wild Basil | Clement | A3 | 118--OCI--mic | Willd. | 0920007103 | |
| Odontites jaubertianus | French Bartsia | Yes | A1 | 124--21--1 | Ne | (Boreau) D. Dietr. ex Walp. | 0920007463 |
| Odontites jaubertianus subsp. chrysanthus | Yes S1 | A1 | 124--21--1--a | (Boreau) P. Fourn. | 0920007463 | ||
| Odontites vernus | Red Bartsia | Page 59 | A1 | 124--21--2 | N | (Bellardi) Dumort. | 0920001361 |
| Odontites vernus subsp. litoralis | Yes | A1 | 124--21--2--c | N | (Fr.) Nyman | 0920001361.3 | |
| Odontites vernus subsp. serotinus | Yes | A1 | 124--21--2--b | (Syme) Corb. | 0920001361.1 | ||
| Odontites vernus subsp. vernus | Yes | A1 | 124--21--2--a | 0920001361.2 | |||
| Oemleria cerasiformis | Osoberry | Yes | A1 | 75--23--1 | Ne | (Torr. & A. Gray ex Hook. & Arn.) J.W. Landon | 0920007464 |
| Oenanthe aquatica | Fine-leaved Water-dropwort | Page 59 | A1 | 107--19--7 | N | (L.) Poir. | 0920001362 |
| Oenanthe crocata | Hemlock Water-dropwort | Page 59 | A1 | 107--19--5 | N | L. | 0920001363 |
| Oenanthe fistulosa | Tubular Water-dropwort | Yes | A1 | 107--19--1 | N | L. | 0920001364 |
| Oenanthe fluviatilis | River Water-dropwort | Yes | A1 | 107--19--6 | N | (Bab.) Coleman | 0920001365 |
| Oenanthe lachenalii | Parsley Water-dropwort | Page 59 | A1 | 107--19--4 | N | C.C. Gmel. | 0920001366 |
| Oenanthe pimpinelloides | Corky-fruited Water-dropwort | Yes | A1 | 107--19--3 | N | L. | 0920001367 |
| Oenanthe silaifolia | Narrow-leaved Water-dropwort | Yes | A1 | 107--19--2 | N | M. Bieb. | 0920001368 |
| Oenothera affinis | Clement | A3 | 84--4--aff | Cambess. | 0920007104 | ||
| Oenothera biennis | Common Evening-primrose | Page 61 | A1 | 84--4--3 | Ne | L. | 0920001370 |
| Oenothera biennis x cambrica | Yes | A1 | 84--4--3 x 4 | 0920007465 | |||
| Oenothera cambrica | Small-flowered Evening-primrose | Yes | A1 | 84--4--4 | Ne | Rostanski | 0920002368 |
| Oenothera canovirens | Clement | A3 | 84--4--can | Steele | 0920007105 | ||
| Oenothera drummondii | Clement | A3 | 84--4--dru | Hook. | 0920007106 | ||
| Oenothera glazioviana | Large-flowered Evening-primrose | Page 61 S2 | A1 | 84--4--1 | Ne | P. Micheli | 0920001371 |
| Oenothera glazioviana x biennis = O. x fallax | Yes S1 | A1 | 84--4--1 x 3 | ? | Renner | 0920002369 | |
| Oenothera glazioviana x biennis x cambrica | Yes S1 | A1 | 84--4--1 x 3 x 4 | 0920007467 | |||
| Oenothera glazioviana x cambrica = O. x britannica | Yes | A1 | 84--4--1 x 4 | Rostanski | 0920007470 | ||
| Oenothera humifusa | Clement | A3 | 84--4--hum | Nutt. | 0920007107 | ||
| Oenothera indecora | Clement | A3 | 84--4--ind | Cambess. | 0920007108 | ||
| Oenothera laciniata | Cut-leaved Evening-primrose | Clement | A3 | 84--4--lac | Hill | 0920002370 | |
| Oenothera lipsiensis | Clement | A3 | 84--4--lip | Rostanski & Gutte | 0920007109 | ||
| Oenothera missouriensis | Missouri Evening-primrose | Clement | A3 | 84--4--mis | Sims | 0920004127 | |
| Oenothera parviflora | Clement | A3 | 84--4--par | L. | 0920001369 | ||
| Oenothera perangusta | Clement | A3 | 84--4--pea | R.R. Gates | 0920002373 | ||
| Oenothera perennis | Small Sundrops | Clement | A3 | 84--4--pee | L. | 0920007110 | |
| Oenothera rosea | Rosy Evening-primrose | Clement | A3 | 84--4--ros | Aiton | 0920002375 | |
| Oenothera rubricaulis | Clement | A3 | 84--4--rub | Kleb. | 0920002377 | ||
| Oenothera rubricuspis | Clement | A3 | 84--4--ruc | Renner ex Rost nski | 0920002376 | ||
| Oenothera salicifolia | Clement | A3 | 84--4--sal | Desf. ex G. Don | 0920002378 | ||
| Oenothera stricta | Fragrant Evening-primrose | Yes | A1 | 84--4--5 | Ne | Ledeb. ex Link | 0920001373 |
| Oenothera tetraptera | Clement | A3 | 84--4--tet | Cav. | 0920002379 | ||
| Oenothera victorinii | Victorin's Evening-primrose | Clement | A3 | 84--4--vic | R.R. Gates & Catches. | 0920007111 | |
| Olearia avicenniifolia | Mangrove-leaved Daisy-bush | Yes S1 | A1 | 135--45--avi | Ne | (Raoul) Hook. f. | 0920003495 |
| Olearia avicenniifolia x moschata = O. x haastii | Daisy-bush | Yes | A1 | 135--45--avi x mos | Ne | Hook. f. | 0920007473 |
| Olearia ilicifolia | Maori-holly | Clement | A3 | 135--45--ili | (Hook. f.) Hook. f. | 0920007112 | |
| Olearia macrodonta | New Zealand Holly | Yes | A1 | 135--45--2 | Ne | Baker | 0920002620 |
| Olearia nummulariifolia | Sticky Daisy-bush | Clement | A3 | 135--45--num | (Hook. f.) Hook. f. | 0920007113 | |
| Olearia paniculata | Akiraho | Yes | A1 | 135--45--1 | Ne | (J.R. Forst. & G. Forst.) Druce | 0920007471 |
| Olearia solandri | Coastal Daisy-bush | Clement | A3 | 135--45--sol | Hook. f. | 0920008154 | |
| Olearia traversii | Ake-ake | Yes | A1 | 135--45--3 | Ne | (F. Muell.) Hook. f. | 0920007472 |
| Omphalodes linifolia | Clement | A3 | 116--16--lin | (L.) Moench | 0920007114 | ||
| Omphalodes verna | Blue-eyed-Mary | Yes | A1 | 116--16--1 | Ne | Moench | 0920001374 |
| Oncosiphon grandiflorum | Clement | A3 | 135--ONC--gra | (Thunb.) K„llersj” | 0920008155 | ||
| Oncosiphon piluliferum | Stink-net | Clement | A3 | 135--ONC--pil | (L. f.) K„llersj” | 0920007115 | |
| Oncosiphon suffruticosum | Clement | A3 | 135--ONC--suf | (L.) K„llersj” | 0920007128 | ||
| Onobrychis aequidentata | Clement | A3 | 77--6--aeq | (Sibth. & Sm.) d'Urv. | 0920005564 | ||
| Onobrychis alba | Clement | A3 | 77--6--alb | (Waldst. & Kit.) Desv. | 0920007130 | ||
| Onobrychis caput-galli | Cockscomb Sainfoin | Clement | A3 | 77--6--cap | (L.) Lam. | 0920007200 | |
| Onobrychis crista-galli | Clement | A3 | 77--6--cri | (L.) Lam. | 0920007677 | ||
| Onobrychis viciifolia | Sainfoin | Page 61 | A1 | 77--6--1 | ?N | Scop. | 0920001375 |
| Onoclea sensibilis | Sensitive Fern | Yes | A1 | 16--2--1 | Ne | L. | 0910002505 |
| Ononis alopecuroides | Salzmann's Restharrow | Stace | A2 | 77--16--alo | Ca | L. | 0920008156 |
| Ononis baetica | Andalucian Restharrow | Stace | A2 | 77--16--bae | Ca | Clemente | 0920003499 |
| Ononis mitissima | Mediterranean Restharrow | Stace | A2 | 77--16--mit | Ca | L. | 0920008157 |
| Ononis natrix | Yellow Restharrow | Yes | A1 | 77--16--1 | Ne | L. | 0920007474 |
| Ononis reclinata | Small Restharrow | Yes | A1 | 77--16--2 | N | L. | 0920001376 |
| Ononis repens | Common Restharrow | Page 61 | A1 | 77--16--4 | N | L. | 0920001377 |
| Ononis repens subsp. maritima | Yes | A1 | 77--16--4--b | (Gren. & Godr.) Asch. & Graebn. | 0920001377.1 | ||
| Ononis repens subsp. repens | Yes | A1 | 77--16--4--a | 0920001377.2 | |||
| Ononis serrata | Clement | A3 | 77--16--ser | Forssk. | 0920007678 | ||
| Ononis spinosa | Spiny Restharrow | Page 61 | A1 | 77--16--3 | N | L. | 0920001378 |
| Ononis spinosa x repens = O. x pseudohircina | Yes | A1 | 77--16--3 x 4 | Schur | 0920002701 | ||
| Ononis viscosa | Clement | A3 | 77--16--vis | L. | 0920007679 | ||
| Onopordum acanthium | Cotton Thistle | Page 61 | A1 | 135--7--1 | Ar | L. | 0920001379 |
| Onopordum illyricum | Illyrian Thistle | Clement | A3 | 135--7--ill | L. | 0920007681 | |
| Onopordum macracanthum | Clement | A3 | 135--7--mac | Boiss. | 0920007683 | ||
| Onopordum nervosum | Reticulate Thistle | Yes S1 | A1 | 135--7--ner | Ne | Boiss. | 0920003506 |
| Onopordum tauricum | Clement | A3 | 135--7--tau | Willd. | 0920007700 | ||
| Ophioglossum azoricum | Small Adder's-tongue | Yes | A1 | 5--1--2 | N | C. Presl | 0910001381.1 |
| Ophioglossum lusitanicum | Least Adder's-tongue | Yes | A1 | 5--1--3 | N | L. | 0910001380 |
| Ophioglossum vulgatum | Adder's-tongue | Page 61 | A1 | 5--1--1 | N | L. | 0910001381.2 |
| Ophrys apifera | Bee Orchid | Page 61 | A1 | 162--23--3 | N | Huds. | 0920001382 |
| Ophrys apifera x fuciflora = O. x albertiana | Yes | A1 | 162--23--3 x 4 | E.G. Camus | 0920002842 | ||
| Ophrys bertolonii | Clement | A3 | 162--23--ber | Moretti | 0920002292 | ||
| Ophrys fuciflora | Late Spider-orchid | Yes | A1 | 162--23--4 | N | (Crantz) Moench | 0920001383 |
| Ophrys insectifera | Fly Orchid | Page 61 | A1 | 162--23--1 | N | L. | 0920001384 |
| Ophrys insectifera x apifera | Yes | A1 | 162--23--1 x 3 | 0920004347 | |||
| Ophrys insectifera x sphegodes = O. x hybrida | Yes | A1 | 162--23--1 x 2 | Pokorny | 0920002856 | ||
| Ophrys sphegodes | Early Spider-orchid | Yes | A1 | 162--23--2 | N | Mill. | 0920001385 |
| Ophrys sphegodes x fuciflora = O. x obscura | Yes S2 | A1 | 162--23--2 x 4 | Beck | |||
| Orchis laxiflora | Loose-flowered Orchid | Yes | A1 | 162--20--1 | N | Lam. | 0920001386 |
| Orchis laxiflora x morio = O. x alata | Yes | A1 | 162--20--1 x 3 | Fleury | 0920002858 | ||
| Orchis mascula | Early-purple Orchid | Page 61 | A1 | 162--20--2 | N | (L.) L. | 0920001387 |
| Orchis mascula x morio = O. x morioides | Yes | A1 | 162--20--2 x 3 | Brand | 0920002859 | ||
| Orchis militaris | Military Orchid | Yes | A1 | 162--20--6 | N | L. | 0920001388 |
| Orchis militaris x simia = O. x beyrichii | Yes | A1 | 162--20--6 x 7 | A. Kern. | 0920002857 | ||
| Orchis morio | Green-winged Orchid | Page 61 | A1 | 162--20--3 | N | L. | 0920001389 |
| Orchis pallens | Pale-flowered Orchid | Clement | A3 | 162--20--pal | L. | 0920007731 | |
| Orchis palustris | Clement | A3 | 162--20--pau | Jacq. | 0920007732 | ||
| Orchis purpurea | Lady Orchid | Yes | A1 | 162--20--5 | N | Huds. | 0920001390 |
| Orchis purpurea x Aceras anthropophorum = X Orchiaceras meilscheimeri | Yes S2 | A1 | 162--20 x 21--5 x 1 | (Rouy) P. Fourn. | |||
| Orchis simia | Monkey Orchid | Yes | A1 | 162--20--7 | N | Lam. | 0920001391 |
| Orchis simia x Aceras anthropophorum = X Orchiaceras bergonii | Yes | A1 | 162--20 x 21--7 x 1 | (De Nant.) E.G. Camus | 0920004350 | ||
| Orchis ustulata | Burnt Orchid | Yes | A1 | 162--20--4 | N | L. | 0920001392 |
| Oreopteris limbosperma | Lemon-scented Fern | Page 61 | A1 | 14--3--1 | N | (All.) Holub | 0910002051 |
| Origanum majorana | Pot Marjoram | Clement | A3 | 118--20--maj | L. | 0920008158 | |
| Origanum onites | Clement | A3 | 118--20--oni | L. | 0920007733 | ||
| Origanum virens | Clement | A3 | 118--20--vir | Hoffmanns. & Link | 0920007734 | ||
| Origanum vulgare | Wild Marjoram | Page 61 | A1 | 118--20--1 | N | L. | 0920001393 |
| Orlaya daucoides | Flat-fruited Orlaya | Clement | A3 | 107--ORL--dau | (L.) Greuter | 0920007735 | |
| Orlaya grandiflora | Large-flowered Orlaya | Clement | A3 | 107--ORL--gra | (L.) Hoffm. | 0920007736 | |
| Ornithogalum angustifolium | Star-of-Bethlehem | Page 61 | A1 | 158--18--2 | Ne | Boreau | 0920001396 |
| Ornithogalum arabicum | Clement | A3 | 158--18--ara | L. | 0920004064 | ||
| Ornithogalum narbonense | Clement | A3 | 158--18--nar | L. | 0920007737 | ||
| Ornithogalum nutans | Drooping Star-of-Bethlehem | Yes | A1 | 158--18--3 | Ne | L. | 0920001394 |
| Ornithogalum pyrenaicum | Spiked Star-of-Bethlehem | Yes | A1 | 158--18--1 | N | L. | 0920001395 |
| Ornithogalum thyrsoides | Chincherinchee | Clement | A3 | 158--18--thy | Jacq. | 0920007738 | |
| Ornithogalum umbellatum | Garden Star-of-Bethlehem | Yes S2 | A1 | 158--18--umb | L. | ||
| Ornithopus compressus | Yellow Serradella | Yes | A1 | 77--10--1 | Ne | L. | 0920007475 |
| Ornithopus perpusillus | Bird's-foot | Page 61 | A1 | 77--10--3 | N | L. | 0920001397 |
| Ornithopus pinnatus | Orange Bird's-foot | Yes | A1 | 77--10--4 | N | (Mill.) Druce | 0920001398 |
| Ornithopus sativus | Serradella | Yes S3 | A1 | 77--10--2 | Ne | Brot. | 0920007124 |
| Orobanche aegyptiaca | Clement | A3 | 125--2--aeg | Pers. | 0920007739 | ||
| Orobanche alba | Thyme Broomrape | Yes | A1 | 125--2--5 | N | Stephan ex Willd. | 0920001399 |
| Orobanche caryophyllacea | Bedstraw Broomrape | Yes | A1 | 125--2--3 | N | Sm. | 0920001400 |
| Orobanche crenata | Bean Broomrape | Yes | A1 | 125--2--7 | Ne | Forssk. | 0920004434 |
| Orobanche elatior | Knapweed Broomrape | Page 61 | A1 | 125--2--4 | N | Sutton | 0920001401 |
| Orobanche flava | Butterbur Broomrape | Clement | A3 | 125--2--fla | Mart. ex F.W. Schultz | 0920004045 | |
| Orobanche hederae | Ivy Broomrape | Page 61 | A1 | 125--2--8 | N | Duby | 0920001402 |
| Orobanche lucorum | Barberry Broomrape | Clement | A3 | 125--2--luc | A. Braun | 0920004109 | |
| Orobanche minor | Common Broomrape | Page 61 | A1 | 125--2--10 | N | Sm. | 0920001404 |
| Orobanche picridis | Oxtongue Broomrape | Yes S2 | A1 | 125--2--9 | N | F.W. Schultz | 0920001405 |
| Orobanche purpurea | Yarrow Broomrape | Yes | A1 | 125--2--1 | N | Jacq. | 0920001406 |
| Orobanche ramosa | Hemp Broomrape | Clement | A3 | 125--2--ram | L. | 0920001407 | |
| Orobanche rapum-genistae | Greater Broomrape | Yes | A1 | 125--2--2 | N | Thuill. | 0920001408 |
| Orobanche reticulata | Thistle Broomrape | Yes | A1 | 125--2--6 | N | Wallr. | 0920001409 |
| Orobanche reticulata subsp. pallidiflora | Yes S2 | A1 | 125--2--6--a | (Wimmer & Grab.) Hayek | 0920001409 | ||
| Ortachne rariflora | Clement | A3 | 153--ORT--rar | (Hook f.) Hughes | 0920007740 | ||
| Orthilia secunda | Serrated Wintergreen | Yes | A1 | 66--2--1 | N | (L.) House | 0920001410 |
| Orthocarpus erianthus | Butter-and-eggs | Clement | A3 | 124--ORT--eri | Benth. | 0920007741 | |
| Orthocarpus purpurascens | Purple Owl-clover | Clement | A3 | 124--ORT--pur | Benth. | 0920007742 | |
| Oryzopsis miliacea | Smilo-grass | Yes | A1 | 153--10--1 | Ne | (L.) Benth. & Hook. f. ex Asch. & Schweinf. | 0920007476 |
| Oryzopsis thomasii | Clement | A3 | 153--10--tho | (Duby) P. Silva | 0920007743 | ||
| Oscularia deltoides | Deltoid-leaved Dewplant | Yes | A1 | 42--4--1 | Ne | (L.) Schwantes | 0920002392 |
| Osmanthus decorus x delavayi = O. x burkwoodii | Clement | A3 | 123--OSM--dec x del | (Burkwood & Skipwith) P.S. Green | 0920007745 | ||
| Osmanthus heterophyllus | Clement | A3 | 123--OSM--het | (G. Don) P.S. Green | 0920007744 | ||
| Osmorhiza chilensis | Clement | A3 | 107--OSM--chi | Hook. & Arn. | 0920007746 | ||
| Osmunda regalis | Royal Fern | Page 61 | A1 | 6--1--1 | N | L. | 0910001411 |
| Osteospermum jucundum | Osteospermum | Yes S2 | A1 | 135--OST--juc | (E. Phillips) Norl. | 0920004157 | |
| Otanthus maritimus | Cottonweed | Yes | A1 | 135--52--1 | N | (L.) Hoffmanns. & Link | 0920001412 |
| Othonna angustifolia | Clement | A3 | 135--OTH--ang | DC. | 0920007747 | ||
| Oxalis acetosella | Wood-sorrel | Page 61 | A1 | 102--1--9 | N | L. | 0920001413 |
| Oxalis articulata | Pink-sorrel | Yes | A1 | 102--1--8 | Ne | Savigny | 0920001415 |
| Oxalis conorrhiza | Clement | A3 | 102--1--con | Jacq. | 0920007748 | ||
| Oxalis corniculata | Procumbent Yellow-sorrel | Page 63 | A1 | 102--1--3 | Ne | L. | |
| Oxalis debilis | Large-flowered Pink-sorrel | Page 63 | A1 | 102--1--10 | Ne | Kunth | 0920002519 |
| Oxalis decaphylla | Ten-leaved Pink-sorrel | Yes S1 | A1 | 102--1--dec | Ne | Kunth | 0920003510 |
| Oxalis dillenii | Sussex Yellow-sorrel | Yes | A1 | 102--1--5 | Ne | Jacq. | 0920002517 |
| Oxalis exilis | Least Yellow-sorrel | Yes | A1 | 102--1--4 | Ne | A. Cunn. | 0920001414.3 |
| Oxalis incarnata | Pale Pink-sorrel | Yes | A1 | 102--1--14 | Ne | L. | 0920002518 |
| Oxalis lasiandra | Clement | A3 | 102--1--las | Zucc. | 0920007749 | ||
| Oxalis latifolia | Garden Pink-sorrel | Yes | A1 | 102--1--11 | Ne | Kunth | 0920002520 |
| Oxalis megalorrhiza | Fleshy Yellow-sorrel | Yes | A1 | 102--1--7 | Ne | Jacq. | 0920002521 |
| Oxalis perennans | Woody-rooted Yellow-sorrel | Clement | A3 | 102--1--per | Haw. | 0920007750 | |
| Oxalis pes-caprae | Bermuda-buttercup | Yes | A1 | 102--1--13 | Ne | L. | 0920002523 |
| Oxalis purpurata | Clement | A3 | 102--1--pur | Jacq. | 0920007751 | ||
| Oxalis rosea | Annual Pink-sorrel | Yes | A1 | 102--1--2 | Ne | Jacq. | 0920007477 |
| Oxalis stricta | Upright Yellow-sorrel | Yes | A1 | 102--1--6 | Ne | L. | 0920001416 |
| Oxalis tetraphylla | Four-leaved Pink-sorrel | Yes | A1 | 102--1--12 | Ne | Cav. | 0920002522 |
| Oxalis valdiviensis | Chilean Yellow-sorrel | Yes | A1 | 102--1--1 | Ne | Barn‚oud | 0920002524 |
| Oxygonum sinuatum | Clement | A3 | 47--OXY--sin | (Meisn.) Dammer | 0920007752 | ||
| Oxyria digyna | Mountain Sorrel | Page 63 | A1 | 47--9--1 | N | (L.) Hill | 0920001420 |
| Oxytropis campestris | Yellow Oxytropis | Yes | A1 | 77--5--2 | N | (L.) DC. | 0920001421 |
| Oxytropis halleri | Purple Oxytropis | Yes | A1 | 77--5--1 | N | Bunge ex W.D.J. Koch | 0920001422 |