| Adoxa moschatellina | Moschatel | 1999 Harefield, Middx |
| Alchemilla glomerulans | Lady's-mantle | 1999 Upper Teesdale |
| Alchemilla monticola | Lady's-mantle | 1999 Upper Teesdale |
| Alchemilla spp. | Lady's-mantle | 1999 Derbyshire |
| Alchemilla subcrenata | Lady's-mantle | 1999 Upper Teesdale |
| Alisma lanceolatum | Narrow-leaved Water-plantain | 1999 N. Somerset |
| Allium paradoxum | Few-flowered Garlic | 1999 Guildford Surrey |
| Allium paradoxum | Few-flowered Garlic | 1999 New Forest |
| Allium vineale | Wild Onion | 1999 Kent |
| Ammophila arenaria | Marram Grass | 1999 Anglesey |
| Anemone nemorosa | Wood Anemone | 1999 Harefield, Middx |
| Anisantha diandra | Great Brome | 1999 Kent |
| Anthemis cotula | Stinking Chamomile | 1999 Kent |
| Anthyllis vulneraria ssp. vulneraria | Kidney Vetch | 1999 Kent |
| Aphanes arvensis | Parsley-piert | 1999 Bredon Worcs |
| Apium graveolens | Wild Celery | 1999 N. Somerset |
| Arabidopsis thaliana | Thale Cress | 1999 Guildford Surrey |
| Arabidopsis thaliana | Thale Cress | 1999 New Forest |
| Arabis hirsuta | Hairy Rock-cress | 1999 Kent |
| Artemisia verlotiorum | Chinese Mugwort | 1999 Ham Riverlands |
| Asarum europaeum | Asarabacca | 1999 New Forest |
| Asplenium ruta-muraria | Wall Rue | 1999 Guildford Surrey |
| Asplenium trichomanes ssp. pachyrachis | Maidenhair spleenwort | 1999 Upper Teesdale |
| Asplenium viride | Green Spleenwort | 1999 Derbyshire |
| Aster linosyris | Goldilocks Aster | 1999 N. Somerset |
| Atriplex glabriuscula | Babington's Orache | 1999 Kent |
| Atriplex laciniata | Frosted Orache | 1999 Anglesey |
| Bartsia alpina | Alpine Bartsia | 1999 Upper Teesdale |
| Berberis x stenophylla | Hedge Barberry | 1999 Derbyshire |
| Bolboschoenus maritimus | Sea Clubrush | 1999 N. Somerset |
| Botrychium lunaria | Moonwort | 1999 Exmoor Somerset |
| Botrychium lunaria | Moonwort | 1999 Upper Teesdale |
| Brassica nigra | Black Mustard | 1999 N. Somerset |
| Bromopsis erecta | Upright Brome | 1999 Bredon Worcs |
| Bromus hordeaceus ssp. hordeaceus | Soft Brome | 1999 Kent |
| Bromus hordeaceus ssp. thominei | Soft Brome | 1999 Kent |
| Bromus x pseudothominei | Lesser Soft-brome | 1999 Kent |
| Buddleia x weyeriana | Hybrid Buddleia | 1999 Ham Riverlands |
| Bunias orientalis | Warty Cabbage | 1999 Ham Riverlands |
| Buxus sempervirens | Box | 1999 Harefield, Middx |
| Cakile maritima | Se Rocket | 1999 Anglesey |
| Callitriche truncata | Short-leaved Water-starwort | 1999 Kent |
| Calystegia soldanella | Sea Bindweed | 1999 Anglesey |
| Capsella rubella | Pink Shepherd's Purse | 1999 New Forest |
| Cardamine bulbifera | Coralroot | 1999 Harefield, Middx |
| Carduus nutans | Nodding Thistle | 1999 N. Somerset |
| Carex binervis | Green-ribbed Sedge | 1999 Anglesey |
| Carex caryophyllea | Spring-sedge | 1999 Derbyshire |
| Carex diandra | Lesser Tussock-sedge | 1999 Anglesey |
| Carex digitata | Fingered Sedge | 1999 Silverdale, Lancs |
| Carex disticha | Brown Sedge | 1999 Upper Teesdale |
| Carex elata | Tufted Sedge | 1999 Anglesey |
| Carex ericetorum | Early Spring Sedge | 1999 Upper Teesdale |
| Carex hostiana | Tawny Sedge | 1999 Anglesey |
| Carex montana | Soft-leaved Sedge | 1999 New Forest |
| Carex ornithopoda | Bird's-foot Sedge | 1999 Derbyshire |
| Carex pseudocyperus | Cyperus Sedge | 1999 Kent |
| Carex viridula ssp. brachyrhyncha | Long-stalked Yellow-sedge | 1999 Anglesey |
| Carex x deserta | Hybrid Sedge (C. binervis x C. laevigata) | 1999 Exmoor Somerset |
| Catapodium maritimum | Sea Fern-grass | 1999 Anglesey |
| Cerastium arvense | Field Mouse-ear | 1999 Bredon Worcs |
| Ceratochloa cathartica | Rescue Brome | 1999 Guildford Surrey |
| Ceterach officinarum | Rusty Back Fern | 1999 Silverdale, Lancs |
| Ceterach officinarum | Rusty-back Fern | 1999 Guildford Surrey |
| Chaenorhinum minus | Small Toadflax | 1999 Bredon Worcs |
| Chiastophyllum oppositifolium | Lamb's-tails | 1999 Silverdale, Lancs |
| Chionodoxa forbesii | Glory of the Snow | 1999 Guildford Surrey |
| Chrysosplenium alternifolium | Alternate-leaved Golden-saxifrage | 1999 Guildford Surrey |
| Chrysosplenium oppositifolium | Opposite-leaved Golden-saxifrage | 1999 New Forest |
| Cirsium dissectum | Meadow Thistle | 1999 N. Somerset |
| Cladium mariscus | Great Fen-sedge | 1999 Anglesey |
| Claytonia sibirica | Pink Purslane | 1999 New Forest |
| Cochlearia pyrenaica | Upland Scurveygrass | 1999 Upper Teesdale |
| Convallaria majalis | Lily-of-the-Valley | 1999 Silverdale, Lancs |
| Conyza sumatrensis | Guernsey Fleabane | 1999 Ham Riverlands |
| Corydalis solida | Bird-in-a-Bush | 1999 Guildford Surrey |
| Crambe maritima | Sea-kale | 1999 Kent |
| Crassula tillaea | Mossy Stonecrop | 1999 New Forest |
| Crepis biennis | Rough Hawk's-beard | 1999 Silverdale, Lancs |
| Cuscuta epithymum | Dodder | 1999 Kent |
| Cynodon dactylon | Bermuda Brass | 1999 N. Somerset |
| Cynoglossum officinale | Hound's-tongue | 1999 Bredon Worcs |
| Cynosurus echinatus | Rough Dog's-tail | 1999 Kent |
| Cystopteris fragilis | Brittle Bladder-fern | 1999 Silverdale, Lancs |
| Cytisus scoparius | Broom | 1999 New Forest |
| Dactylorhiza fuchsii | Common˜Spotted Orchid | 1999 Anglesey |
| Dactylorhiza incarnata ssp. coccinea | Early Marsh Orchid | 1999 Anglesey |
| Dactylorhiza maculata | Heath Spotted Orchid | 1999 Anglesey |
| Dactylorhiza praetermissa | Southern Marsh Orchid | 1999 N. Somerset |
| Dactylorhiza purpurella | Northern marsh Orchid | 1999 Anglesey |
| Dactylorhiza purpurella | Northern Marsh Orchid | 1999 Upper Teesdale |
| Dactylorhiza x transiens | Hybrid Marsh Orchid | 1999 Anglesey |
| Dactylorhiza x venusta | Hybrid Marsh Orchid | 1999 Upper Teesdale |
| Daphne laureola | Spurge Laurel | 1999 Guildford Surrey |
| Daphne mezereum | Mezereon | 1999 Silverdale, Lancs |
| Dianthus armeria | Deptford Pink | 1999 Anglesey |
| Dianthus gratianopolitanus | Cheddar Pink | 1999 N. Somerset |
| Digitaria sanguinalis | Hairy Finger-grass | 1999 Ham Riverlands |
| Draba incana | Hoary Whitlowgrass | 1999 Derbyshire |
| Dryas octopetala | Mountain Avens | 1999 Upper Teesdale |
| Dryopteris affinis ssp. affinis | Scaly Male-fern | 1999 Guildford Surrey |
| Elytrigia atherica | Sand Couch | 1999 N. Somerset |
| Epipactis leptochila var. dunensis | Narrow-lipped Helleborine | 1999 Anglesey |
| Epipactis palustris | Marsh Helleborine | 1999 Anglesey |
| Equisetum arvense | Field Horsetail | 1999 N. Somerset |
| Equisetum pratense | Shady Horsetail | 1999 Upper Teesdale |
| Equisetum ramosissimum | Branched Horsetail | 1999 N. Somerset |
| Equisetum variegatum | Variegated Horsetail | 1999 Anglesey |
| Equisetum variegatum | Variegated Horsetail | 1999 Upper Teesdale |
| Erigeron glaucus | Seaside Daisy | 1999 N. Somerset |
| Erigeron glaucus | Seaside Daisy | 1999 Kent |
| Erodium cicutarium | Common Stork's-bill | 1999 Kent |
| Erodium maritimum | Sea Stork's-bill | 1999 N. Somerset |
| Erodium maritimum | Sea Stork's-bill | 1999 Kent |
| Erophila verna | Common Whitlowgrass | 1999 Guildford Surrey |
| Eryngium maritimum | Sea Holly | 1999 Anglesey |
| Eschscholzia californica | Californian Poppy | 1999 Ham Riverlands |
| Euphorbia amygdaloides | Wood Spurge | 1999 New Forest |
| Euphorbia paralias | Sea Spurge | 1999 Anglesey |
| Euphorbia portlandica | Portland Spurge | 1999 Anglesey |
| Euphrasia arctica ssp. borealis | Eyebright | 1999 Upper Teesdale |
| Euphrasia pseudokerneri | Eyebright | 1999 Kent |
| Festuca arenaria | Rush-leaved Fescue | 1999 Kent |
| Festuca ovina ssp. hirtula | Sheep's Fescue | 1999 Silverdale, Lancs |
| Festuca rubra ssp. juncea | Red Fescue | 1999 Kent |
| Festuca rubra ssp. rubra | Red Fescue | 1999 Kent |
| Frankenia laevis | Sea Heath | 1999 Anglesey |
| Fritillaria meleagris | Fritillary | 1999 Harefield, Middx |
| Fumaria densiflora | Dense-flowered Fumitory | 1999 Kent |
| Gaillardia x grandiflora | Blanket-flower | 1999 Kent |
| Galeobdolon luteum | Yellow Archangel | 1999 New Forest |
| Galium boreale | Northern Bedstraw | 1999 Upper Teesdale |
| Galium sterneri | Limestone Bedstraw | 1999 Derbyshire |
| Gaudinia fragilis | French Oat-grass | 1999 N. Somerset |
| Gentiana verna | Spring Gentian | 1999 Upper Teesdale |
| Geranium columbinum | Long-stalked Crane's-bill | 1999 Silverdale, Lancs |
| Geranium endressii | French Cranesbill | 1999 N. Somerset |
| Geranium lucidum | Shining Crane's-bill | 1999 N. Somerset |
| Geranium lucidum | Shining Crane's-bill | 1999 Derbyshire |
| Geranium rotundifolia | Round-leaved Crane's-bill | 1999 Guildford Surrey |
| Geranium versicolor | Pencilled Crane's-bill | 1999 N. Somerset |
| Geranium x monacense | Munich Crane's-bill | 1999 Guildford Surrey |
| Geum rivale | Water Avens | 1999 New Forest |
| Glaux maritima | Sea Milkwort | 1999 Anglesey |
| Gymnadenia conopsea ssp. conopsea | Fragrant Orchid | 1999 Kent |
| Gymnocarpium robertianum | Limestone Fern | 1999 Derbyshire |
| Helianthemum nummularium | Common Rock-rose | 1999 Derbyshire |
| Helianthemum oelandicum ssp. levigatum | Hoary Rockrose | 1999 Upper Teesdale |
| Helictotrichon pratense | Meadow Oat-grass | 1999 Bredon Worcs |
| Helictotrichon pubescens | Downy Oat-grass | 1999 Bredon Worcs |
| Heracleum mantegazzianium | Giant Hogweed | 1999 Guildford Surrey |
| Herniaria glabra | Smooth Rupturewort | 1999 N. Somerset |
| Hieracium acuminatum | Hawkweed | 1999 Upper Teesdale |
| Hieracium cheriense | Hawkweed | 1999 Ham Riverlands |
| Hieracium cravoniense | Hawkweed | 1999 Upper Teesdale |
| Hieracium decolor | Hawkweed | 1999 Upper Teesdale |
| Hieracium dicella | Hawkweed | 1999 Upper Teesdale |
| Hieracium leyi | Hawkweed | 1999 Upper Teesdale |
| Hieracium lissolepium | Hawkweed | 1999 Upper Teesdale |
| Hieracium salticola | Hawkweed | 1999 Ham Riverlands |
| Hieracium scotostictum | Hawkweed | 1999 Ham Riverlands |
| Hieracium speluncarum | Hawkweed | 1999 Ham Riverlands |
| Hieracium vulgatum | Hawkweed | 1999 Upper Teesdale |
| Hippocrepis comosa | Horseshoe Vetch | 1999 Silverdale, Lancs |
| Hippocrepis emerus | Scorpion Senna | 1999 Kent |
| Hippuris vulgaris | Mare's-tail | 1999 Silverdale, Lancs |
| Hirschfeldia incana | Hoary Mustard | 1999 N. Somerset |
| Hirschfeldia incana | Hoary Mustard | 1999 Kent |
| Hordeum marinum | Sea Barley | 1999 N. Somerset |
| Huperzia selago | Fir Clubmoss | 1999 Exmoor Somerset |
| Hydrocharis morsus-ranae | Frogbit | 1999 N. Somerset |
| Hypericum xylosteifolium | Turkish Tutsan | 1999 Silverdale, Lancs |
| Jasione montana | Sheep's-bit | 1999 Anglesey |
| Jasione montana | Sheep's-bit | 1999 Kent |
| Juncus alpinoarticulatus | Alpine Rush | 1999 Upper Teesdale |
| Juncus subnodulosus | Blunt-flowered Rush | 1999 Anglesey |
| Juncus subnodulosus | Blunt-flowered Rush | 1999 N. Somerset |
| Juncus triglumis | Three-flowered Rush | 1999 Upper Teesdale |
| Keoleria macrantha | Crested Hair-grass | 1999 N. Somerset |
| Kobresia simpliciuscula | False Sedge | 1999 Upper Teesdale |
| Lagurus ovatus | Hare's-tail | 1999 Kent |
| Lamium maculatum | Spotted Dead-nettle | 1999 Derbyshire |
| Lathraea squamaria | Toothwort | 1999 Derbyshire |
| Lathraea squamaria | Toothwort | 1999 New Forest |
| Lathyrus japonicus | Sea Pea | 1999 Kent |
| Lathyrus montanus | Bitter Vetch | 1999 Derbyshire |
| Lathyrus nissolia | Grass Vetchling | 1999 Kent |
| Lathyrus sylvestris | Narrow-leaved Everlasting Pea | 1999 N. Somerset |
| Legousia hybrida | Venus's-looking-glass | 1999 Bredon Worcs |
| Legousia hybrida | Venus's-looking Glass | 1999 Kent |
| Leoeleria vallesiana | Somerset Hair-grass | 1999 N. Somerset |
| Lepidium latifolium | Dittander | 1999 Ham Riverlands |
| Leymus arenarius | Lyme Grass | 1999 Anglesey |
| Limonium humile | Lax-flowered Sea Lavender | 1999 Anglesey |
| Limonium vulgare | Common Sea Lavender | 1999 Anglesey |
| Linum bienne | Pale Flax | 1999 Kent |
| Linum catharticum | Fairy Flax | 1999 N. Somerset |
| Listera cordata | Lesser Twayblade | 1999 Exmoor Somerset |
| Lithospermum arvense | Field Gromwell | 1999 Bredon Worcs |
| Lithospermum purpureocaeruleum | Purple Gromwell | 1999 N. Somerset |
| Lobularia maritima | Sweet Alison | 1999 N. Somerset |
| Lonicera xylosteum | Fly Honeysuckle | 1999 Derbyshire |
| Lychnis coronaria | Rose Campion | 1999 Kent |
| Lychnis flos-cuculi | Ragged Robin | 1999 Silverdale, Lancs |
| Lycium chinense | Chinese Tea Plant | 1999 Ham Riverlands |
| Lysichiton americanus | American Skunk-cabbage | 1999 Guildford Surrey |
| Lysichiton americanus | American Skunk-cabbage | 1999 New Forest |
| Medicago arabica | Spotted Medick | 1999 Guildford Surrey |
| Medicago arabica | Spotted Medick | 1999 Kent |
| Medicago minima | Bur Medick | 1999 Kent |
| Medicago polymorpha | Toothed Medick | 1999 N. Somerset |
| Medicago polymorpha | Toothed Medick | 1999 Kent |
| Medicago sativa ssp. falcata | Sickle Medick | 1999 Ham Riverlands |
| Medicago sativa ssp. varia | Sand Lucerne | 1999 Ham Riverlands |
| Melica nutans | Mountain Melick | 1999 Derbyshire |
| Melica uniflora | Wood Melick | 1999 New Forest |
| Mimulus x robertsii | Hybrid Monkeyflower | 1999 Upper Teesdale |
| Minuartia verna | Spring Sandwort | 1999 Derbyshire |
| Moenchia erecta | Upright Chickweed | 1999 Kent |
| Montia fontana | Blinks | 1999 Guildford Surrey |
| Muscari neglectum | Grape Hyacinth | 1999 Guildford Surrey |
| Myosotis arvensis | Field Forget-me-not | 1999 Derbyshire |
| Myosotis ramosissima | Early Forget-me-not | 1999 Bredon Worcs |
| Myosurus minimus | Mousetail | 1999 Bredon Worcs |
| Myrica gale | Bog Myrtle | 1999 New Forest |
| Myrica pensylvanica | Bayberry | 1999 New Forest |
| Myriophyllum spicatum | Spiked Water-milfoil | 1999 Kent |
| Myriophyllum verticillatum | Whorled Water-milfoil | 1999 N. Somerset |
| Oenanthe silaifolia | Narrow-leaved Water-dropwort | 1999 Bredon Worcs |
| Onobrychis viciifolia | Sainfoin | 1999 Bredon Worcs |
| Onobrychis viciifolia | Sainfoin | 1999 Kent |
| Onoclea sensibilis | Sensitive Fern | 1999 Guildford Surrey |
| Ophioglossum azoricum | Small Adder's-tongue | 1999 New Forest |
| Ophioglossum vulgatum | Adder's-tongue | 1999 New Forest |
| Ophrys insectifera | Fly Orchid | 1999 Silverdale, Lancs |
| Ophrys sphegodes | Early Spider-orchid | 1999 Kent |
| Orchis mascula | Early Purple Orchid | 1999 Silverdale, Lancs |
| Orchis mascula | Early purple Orchid | 1999 Derbyshire |
| Orchis mascula | Early-purple Orchid | 1999 New Forest |
| Orchis morio | Green Winged Orchid | 1999 Silverdale, Lancs |
| Orobanche hederae | Ivy Broomrape | 1999 N. Somerset |
| Orobanche minor var. minor | Common Broomrape | 1999 Kent |
| Oxalis articulata | Pink Oxalis | 1999 N. Somerset |
| Papaver atlanticum | Atlas Poppy | 1999 Ham Riverlands |
| Paris quadrifolia | Herb Paris | 1999 Silverdale, Lancs |
| Pentaglottis sempervirens | Green Alkanet | 1999 New Forest |
| Petasites japonicus | Giant Butterbur | 1999 Guildford Surrey |
| Petasites japonicus | Giant Butterbur | 1999 New Forest |
| Peucadanum ostruthium | Masterwort | 1999 Upper Teesdale |
| Phalaris arundinacea | Reed Canary-grass | 1999 N. Somerset |
| Phragmites australis | Common Reed | 1999 N. Somerset |
| Pinguicula vulgaris | Common Butterwort | 1999 Upper Teesdale |
| Plantanthera bifolia | Lesser Butterfly orchid | 1999 Anglesey |
| Poa bulbosa | Bulbous Meadow-grass | 1999 Kent |
| Polemonium caeruleum | Jacob's-ladder | 1999 Derbyshire |
| Polygala amarella | Dwarf Milkwort | 1999 Upper Teesdale |
| Polygala calcarea | Chalk Milkwort | 1999 Bredon Worcs |
| Polygala calcarea | Chalk Milkwort | 1999 Kent |
| Polygala vulgaris | Common Milkwort | 1999 Bredon Worcs |
| Polygonatum odoratum | Angular Solomon's-seal | 1999 Silverdale, Lancs |
| Polypogon monspeliensis | Annual Beard-grass | 1999 Kent |
| Polystichum aculeatum | Hard Shield-fern | 1999 Guildford Surrey |
| Polystichum setiferum | Soft Shield-fern | 1999 Guildford Surrey |
| Potamogeton coloratus | Fen Pondweed | 1999 N. Somerset |
| Potamogeton trichoides | Hairlike Pondweed | 1999 Kent |
| Potentilla fruticosa | Shrubby Cinquefoil | 1999 Upper Teesdale |
| Potentilla neumanniana | Spring Cinquefoil | 1999 Derbyshire |
| Potentilla sterilis | Barren Strawberry | 1999 New Forest |
| Primula farinosa | Bird's-eye Primrose | 1999 Upper Teesdale |
| Prunus laurocerasus | Cherry Laurel | 1999 New Forest |
| Pseudosasa japonica | Arrow Bamboo | 1999 Guildford Surrey |
| Pulmonaria longifolia | Narrow-leaved Lungwort | 1999 New Forest |
| Pyrola minor | Common Wintergreen | 1999 Derbyshire |
| Pyrola rotundifolia | Round-leaved Wintergreen | 1999 Anglesey |
| Pyrus communis | Pear | 1999 New Forest |
| Ranunculus arvensis | Corn Buttercup | 1999 Bredon Worcs |
| Ranunculus auricomus | Goldilocks Buttercup | 1999 Harefield, Middx |
| Ranunculus auricomus | Goldilocks Buttercup | 1999 New Forest |
| Ranunculus ficaria | Lesser Celandine | 1999 Harefield, Middx |
| Ranunculus hederaceus | Ivy-leaved Crowfoot | 1999 New Forest |
| Ranunculus omiophyllus | Round-leaved Crowfoot | 1999 New Forest |
| Ranunculus parviflorus | Small-flowered Buttercup | 1999 N. Somerset |
| Ranunculus sceleratus | Celery-leaved Buttercup | 1999 Derbyshire |
| Reseda lutea | Mignonette | 1999 Anglesey |
| Rhinanthus minor ssp. stenophyllus | Yellow Rattle | 1999 Anglesey |
| Ribes alpinum | Mountain Currant | 1999 Derbyshire |
| Rubus caesius | Dewberry | 1999 Derbyshire |
| Rubus saxatilis | Stone Bramble | 1999 Derbyshire |
| Rumex cristatus | Greek Dock | 1999 Ham Riverlands |
| Ruscus aculeatus | Butcher's-broom | 1999 New Forest |
| Sagina maritima | Sea Pearlwort | 1999 Kent |
| Salix multinervis | Hybrid Willow | 1999 Upper Teesdale |
| Salix repens | Creeping Willow | 1999 New Forest |
| Salix x laurina | Hybrid Willow | 1999 Upper Teesdale |
| Salvia verbenaca | Wild Clary | 1999 Kent |
| Saxifraga granulata | Meadow Saxifrage | 1999 Bredon Worcs |
| Saxifraga granulata | meadow Saxifrage | 1999 Guildford Surrey |
| Saxifraga hypnoides | Mossy Saxifrage | 1999 Derbyshire |
| Saxifraga tridactylites | Rue-leaved Saxifrage | 1999 Guildford Surrey |
| Saxifraga tridactylites | Rue-leaved Saxifrage | 1999 Derbyshire |
| Saxifraga x polita | False Londonpride | 1999 Derbyshire |
| Scandix pecten-veneris | Shepherd's-needle | 1999 Bredon Worcs |
| Sedum album | White Stonecrop | 1999 N. Somerset |
| Sedum anglicum | English Stonecrop | 1999 Anglesey |
| Sedum anglicum | English Stonecrop | 1999 Kent |
| Sedum dasyphyllum | Thick-leaved Stonecrop | 1999 Guildford Surrey |
| Sedum forsterianum | Rock Stonecrop | 1999 Kent |
| Sedum telephium | Orpine | 1999 New Forest |
| Selaginella selaginoides | Lesser Clubmoss | 1999 Upper Teesdale |
| Senecio cineraria | Silver Ragwort | 1999 Kent |
| Seriphidium maritimum | Sea Wormwood | 1999 N. Somerset |
| Sherardia arvenis | Field Madder | 1999 Silverdale, Lancs |
| Sherardia arvensis | Field Madder | 1999 Ham Riverlands |
| Sibthorpia europaea | Cornish Moneywort | 1999 Exmoor Somerset |
| Silene conica | Sand Catchfly | 1999 Kent |
| Silene nutans | Nottingham Catchfly | 1999 Kent |
| Silene uniflora | Sea Campion | 1999 N. Somerset |
| Silene uniflora | Sea Campion | 1999 Kent |
| Sisymbrium strictissimum | Perennial Rocket | 1999 Ham Riverlands |
| Sonchus arvensis ssp. uliginosus | Perennial Sow-thistle | 1999 Anglesey |
| Sorbus eminens | Whitebeam | 1999 N. Somerset |
| Sorbus torminalis | Wild Service Tree | 1999 Harefield, Middx |
| Sparganium natans | Least Bur reed | 1999 Anglesey |
| Spergularia rupicola | Rock Sea-spurrey | 1999 Anglesey |
| Stellaria palustris | Marsh Stitchwort | 1999 Anglesey |
| Symphytum bulbosum | Bulbous Comfrey | 1999 Guildford Surrey |
| Symphytum grandiflorum | Creeping Comfrey | 1999 Guildford Surrey |
| Symphytum orientale | Soft Comfrey | 1999 Guildford Surrey |
| Taraxacum lacistophyllum | Dandelion | 1999 Upper Teesdale |
| Taraxacum nordstedtii | Dandelion | 1999 Upper Teesdale |
| Taraxacum unguilobum | Dandelion | 1999 Upper Teesdale |
| Teesdalia nudicaulis | Shepherd's Cress | 1999 Kent |
| Teesdalia nudicaulis | Shepherd's Cress | 1999 New Forest |
| Tellima grandiflora | Fringe-cups | 1999 Derbyshire |
| Tephroseris integrifolia ssp. maritima | Field Fleawort | 1999 Anglesey |
| Teucrium chamaedrys | Wall Germander | 1999 N. Somerset |
| Thelypteris palustris | Marsh Fern | 1999 New Forest |
| Thymus polytrichus | Wild Thyme | 1999 N. Somerset |
| Tilia cordata | Small-leaved Lime | 1999 N. Somerset |
| Tofieldia pusilla | Scottish Asphodel | 1999 Upper Teesdale |
| Tolmeia menziesii | Pick-a-back Plant | 1999 Derbyshire |
| Torilis nodosa | Knotted Hedge-parsley | 1999 Kent |
| Tragopogon pratensis ssp. pratensis | Goat's-beard | 1999 Kent |
| Trifolium glomeratum | Clustered Cover | 1999 Kent |
| Trifolium occidentale | Western Clover | 1999 Anglesey |
| Trifolium ornithopioides | Fenugreek | 1999 N. Somerset |
| Trifolium ornithopodioides | Fenugreek | 1999 Kent |
| Trifolium scabrum | Rough Clover | 1999 Kent |
| Trifolium squamosum | Sea Clover | 1999 N. Somerset |
| Trifolium striatum | Knotted Clover | 1999 Silverdale, Lancs |
| Trifolium striatum | Knotted Clover | 1999 Kent |
| Trifolium subterraneum | Subterranean Clover | 1999 Kent |
| Trifolium suffocatum | Suffocated Clover | 1999 N. Somerset |
| Trifolium suffocatum | Suffocated Clover | 1999 Kent |
| Trifolium tomentosum | Woolly Clover | 1999 N. Somerset |
| Trinia glauca | Honewort | 1999 N. Somerset |
| Trollius europaeus | Globeflower | 1999 Derbyshire |
| Tuberaria guttata | Spotted Rock-rose | 1999 Anglesey |
| Tulipa sylvestris | Wild Tulip | 1999 Harefield, Middx |
| Tussilago farfara | Coltsfoot | 1999 New Forest |
| Vaccinium x intermedium | Hybrid Vaccinium | 1999 Derbyshire |
| Valeriana dioica | Marsh Valerian | 1999 Silverdale, Lancs |
| Valeriana dioica | Marsh Valerian | 1999 Upper Teesdale |
| Valeriana officinalis | Common Valerian | 1999 Derbyshire |
| Valeriana pyrenaica | Pyrenean Valerian | 1999 Derbyshire |
| Valerianella dentata | Narrow-fruited Cornsalad | 1999 Bredon Worcs |
| Verbascum blattaria | Moth Mullein | 1999 Ham Riverlands |
| Veronica catenata | Pink Water-Speedwell | 1999 Silverdale, Lancs |
| Viola lutea | Mountain Pansy | 1999 Derbyshire |
| Viola palustris | Marsh Violet | 1999 New Forest |
| Viola tricolor ssp. curtsii | Wild Pansy | 1999 Anglesey |
| Viscum album | Mistletoe | 1999 New Forest |
| Vulpia ciliata ssp. ambigua | Bearded Fescue | 1999 Kent |
| Vulpia fasciculata | Dune Fescue | 1999 Kent |
| Wahlenbergia hederacea | Ivy-leaved Bellflower | 1999 Exmoor Somerset |