| Adharca Fia | Plantago coronopus | Buck's-horn Plantain | Plantaginaceae |
| Ainleog, Ialus Beag | Convolvulus arvensis | Field Bindweed; Small Bindweed | Convolvulaceae |
| Airgead Luachra, Crios Conchulainn, Cubhar Léanna, Lus Cneas | Filipendula ulmaria | Meadowsweet | Rosaceae |
| Aiteal | Juniperus communis | Juniper | Cupressaceae |
| Aiteann Gaelach, Aiteann Mín, Mionaiteann (Ros Muc) | Ulex gallii | Western Gorse; Autumn Gorse | Fabaceae |
| Aiteann Gallda, Aiteann Francach, Aiteannach | Ulex europaeus | Gorse; Whin; Furze | Fabaceae |
| Alasam Cumhra | Lobularia maritima | Sweet Alison | Brassicaceae |
| Caorthann, Crann Caorthainn | Sorbus aucuparia | Rowan; Mountain Ash | Rosaceae |
| Fionnas Fáil | Torilis japonica | Upright Hedge-parsley | Apiaceae |
| Athair Lusa, Eidhneán Talún | Glechoma hederacea | Ground-ivy | Lamiaceae |
| Athair Thalún, Luibh na nDaitheacha, Fuil Talún, Lus na Fola, Lus na gCluas | Achillea millefolium | Yarrow; Bloodwort | Asteraceae |
| Athair Virginia | Parthenocissus quinquefolia | Virginia-creeper | Vitaceae |
| Bacán Bán, Duilleog Bháite Bhán | Nymphaea alba | White Water-lily | Nymphaeaceae |
| Báchrán, Pónaire Chorraigh, Bearnán Lachán, Pónaire Chapaill, Pónra, Pór an Chapaill, Práta Portaigh, Bachrann, Batram | Menyanthes trifoliata | Bogbean | Menyanthaceae |
| Bainne Bó Bleachtáin, Béal na Bó, Bainne Bó Bleacht, Bó Muc | Primula veris | Cowslip | Primulaceae |
| Bainne Léanna, Spuirse Mhara | Euphorbia paralias | Sea Spurge | Euphorbiaceae |
| Baisleach Bréige | Primula x polyantha | False Oxlip | Primulaceae |
| Barr an Mhilltigh | Triglochin palustris | Marsh Arrowgrass | Juncaginaceae |
| Barr an Mhilltigh Mara | Triglochin maritima | Sea Arrowgrass | Juncaginaceae |
| Beathnua Baineann | Hypericum pulchrum | Slender St John's-wort | Hypericaceae |
| Beathnua Fireann | Hypericum tetrapterum | Square-stalked St John's-wort | Hypericaceae |
| Beathnua gan smál | Hypericum maculatum | Imperforate St. John's-wort | Hypericaceae |
| Beathnua Sraoilleach | Hypericum humifusum | Trailing St John'-wort | Hypericaceae |
| Beirbhéine | Verbena officinalis | Vervain | Verbenaceae |
| Beiteán, Fiteog | Nardus stricta | Mat-grass | Poaceae |
| Beith Clúmhach | Betula pubescens | Downy Birch; Hairy Birch | Betulaceae |
| Beith Gheal | Betula pendula | Silver Birch; Warty Birch | Betulaceae |
| Biolar, Biolar Uisce | Nasturtium officinale | Watercress; Water-cress | Brassicaceae |
| Biolar Buí Corraigh | Rorippa palustris | Marsh Yellow-cress | Brassicaceae |
| Biolar Grá, Lus Cré Uisce | Veronica anagallis-aquatica | Blue Water-speedwell | Plantaginaceae |
| Biolar Trá | Cochlearia officinalis | Common Scurvygrass | Brassicaceae |
| Biorphiobar | Persicaria hydropiper | Water-pepper | Polygonaceae |
| Bleachtán Colgach | Sonchus asper | Prickly Sow-thistle | Asteraceae |
| Bleachtán Léana | Sonchus arvensis | Perennial Sow-thistle; Field Sow-thistle; Corn Sow-thistle | Asteraceae |
| Bleachtán Mín, Bleachtfheochadán | Sonchus oleraceus | Smooth Sow-thistle; Common Smooth Sow-Thistle | Asteraceae |
| Blide Mhara | Suaeda maritima | Annual Sea-blite; Sea-blite | Chenopodiaceae |
| Sailchuach Chorraigh, Ceathrú Chaorach, Ceathrú Luáin | Chenopodium album | Fat Hen; Fat-hen; White Goosefoot | Chenopodiaceae |
| Bóchoinneal | Alliaria petiolata | Garlic mustard; Jack-by-the-hedge | Brassicaceae |
| Bodán Coille | Sanicula europaea | Sanicle; Wood Sanicle | Apiaceae |
| Bogshifín | Schoenoplectus lacustris | Common Club-rush; Bulrush | Cyperaceae |
| Bogshifín Liath | Schoenoplectus tabernaemontani | Grey Club-rush | Cyperaceae |
| Bogshifín Mara | Bolboschoenus maritimus | Sea Club-rush | Cyperaceae |
| Boladh Cnis, Rú Muire | Galium verum | Lady's Bedstraw; Yellow Bedstraw | Rubiaceae |
| Bosán Anagair | Erophila verna | Common Whitlowgrass | Brassicaceae |
| Breallán Dlúth | Lysimachia punctata | Dotted Loosestrife | Primulaceae |
| Breallán Léana | Lysimachia vulgaris | Yellow Loosestrife | Primulaceae |
| Briosclán, Blioscán, Blioscarán, Braoscán, Brioscán, Brisceán, Fearbán | Potentilla anserina/Argentina anserina | Silverweed; Silverweed Cinquefoil | Rosaceae |
| Briúlán | Rosa spinosissima | Burnet Rose | Rosaceae |
| Broimfhéar Gainimh | Elymus junceum | Sand Couch Grass | Poaceae |
| Brómas Bog | Bromus hordeaceus | Soft Brome | Poaceae |
| Bromas Bréige | Brachypodium sylvaticum | False Brome | Poaceae |
| Buachalán Buí, Balcaiseán, Boglus, Bolcaiseán, Boltán Buí, Bóthanán, Buabhall(án), Buacalán, Buachaltán, Buafalán, Buafanán, Búclán, Coiseog Bhuí, Deosadán, Fean Talún, Gaosadán, Géasadán, Geosadán, Giúsadán, Lus San Séam, Bothalan (Buidhe) | Jacobaea vulgaris | Ragwort | Asteraceae |
| Buachalán Corraigh | Jacobaea aquatica | Marsh Ragwort | Asteraceae |
| Buaflíon Balla, Buaflíon Eidhneánach | Cymbalaria muralis | Ivy-leaved Toadflax | Plantaginaceae |
| Buafluachair | Juncus bufonius | Toad Rush | Juncaceae |
| Buí Mór | Reseda luteola | Weld; Yellow-weed; Dyer's Rocket | Resedaceae |
| Buíán, Buíán Buí | Glebionis segetum | Corn Marigold | Asteraceae |
| Cab an Ghasáin, Bréanla Gorm, Bodach Gorm | Knautia arvensis | Field Scabious | Caprifoliaceae |
| Cabáiste an Mhadra Rua | Saxifraga spathularis | St Patrick's-cabbage | Saxifragaceae |
| Cabhán Abhann, Duilleog Bháite Bhuí | Nuphar Lutea | Yellow Water-lily | Nymphaeaceae |
| Cabhsadán, Duilleog na Saor, Lusra Saor | Stachys palustris | Marsh Woundwort; Clown's Woundwort; Clown's All-heal | Lamiaceae |
| Cabróis Mhara Bheag, Corrán Mara Beag | Spergularia marina | Lesser Sea-spurrey; Sea-spurry | Caryophyllaceae |
| Cabróis Mhara Mhór, Corrán Mara Mór | Spergularia media | Greater Sea-spurrey; Sea-spurry; Media Sandspurry | Caryophyllaceae |
| Cabróis na gCloch | Spergularia rupicola | Rock Sea-spurrey | Caryophyllaceae |
| Cailcfhéar | Koeleria macrantha | Crested Hair-grass | Poaceae |
| Cailís Mhuire, Drúchtín | Drosera intermedia | Oblong-leaved Sundew | Droseraceae |
| Cailís Mhuire Mhór | Drosera anglica | Long-leaved Sundew; English Sundew | Droseraceae |
| Cailleach Dhearg | Papaver rhoeas | Common Poppy; Corn Poppy | Papaveraceae |
| Cailleach Fhada, Poipín Fadchochallach | Papaver dubium | Long-headed Poppy | Papaveraceae |
| Cainchín Áiseach | Cotoneaster simonsii | Himalayan Cotoneaster | Rosaceae |
| Cainchín Balla | Cotoneaster horizontalis | Wall Cotoneaster; Rockspray Cotoneaster | Rosaceae |
| Cainchín Franchet | Cotoneaster franchetii | Franchet's Cotoneaster | Rosaceae |
| Cainchín Mion, Cotóinéastar mionduilleach | Cotoneaster microphyllus | Small-leaved Cotoneaster | Rosaceae |
| Cainneann Fhiáin | Allium ampeloprasum | Broadleaf Wild Leek; Perennial Sweet Leek; Great Round-headed Garlic | Amaryllidaceae |
| Caisearbhán, Caisearbhán Coiteann, Bearnán Beárnach, Bearnán Bríde, Bláth Buí, Caisreabhán, Gais-shearbhán, Gathánn Gabhainn, Lus Bhríde, Searbhán (Muc) | Taraxacum spp. | Dandelion | Asteraceae |
| Caisearbhán Corraigh | Taraxacum palustre | Turlough Dandelion; Marsh Dandelion | Asteraceae |
| Caithne | Arbutus unedo | Arbutus; Strawberry Tree | Ericaceae |
| Camán Searraigh Balla | Fumaria muralis | Common Ramping-fumitory | Papaveraceae |
| Caochneantóg Dhearg | Lamium purpureum | Red Dead-nettle | Lamiaceae |
| Caochneantóg Dhiosctha | Lamium hybridum | Cut-leaved Dead-nettle | Lamiaceae |
| Caor Chon | Viburnum opulus | Guelder-rose | Adoxaceae |
| Caorthann Corraigh | Valeriana officinalis | Common Valerian; Wild Valerian | Caprifoliaceae |
| Carrán Creige | Cochlearia danica | Danish Scurvygrass | Brassicaceae |
| Cartlainn Gharraí | Mentha spicata | Spearmint Plant; Spear Mint | Lamiaceae |
| Castán | Castanea sativa | Sweet Chestnut | Fagaceae |
| Catluibh | Antennaria dioica | Mountain Everlasting; Mountain Cudweed | Asteraceae |
| Ceadharlach Bealtaine | Gentiana verna | Spring Gentian | Gentianaceae |
| Ceannbhán, Ceannbhán Caolduilleach, Buinneán Bán, Canach Móna, Flocas, Scathóg Fiáin, Scathóg Fionnaidh, Síoda Móna, Scothóg Fiáin, Scothóg Fionnaidh, Tóin Fhionn, Canach na Sléibhe | Eriophorum angustifolium | Bog Cotton; Common Cottongrass | Cyperaceae |
| Ceannbhán Gaelach | Eriophorum vaginatum | Hare's-tail Cottongrass | Cyperaceae |
| Cearrbhacán Mara | Cakile maritima | Sea Rocket | Brassicaceae |
| Ceathrú Uain | Valerianella locusta | Common Cornsalad; Lamb’s Lettuce; European Cornsalad | hedr |
| Ceotharach Uisce, Lus Míonla Uisce | Myosotis scorpioides | Water Forget-me-not | Boraginaceae |
| Cíb Bhoilgneach | Carex vesicaria | Bladder Sedge | Cyperaceae |
| Cíb Bhuí Mhóna | Carex demissa/Carex viridula subsp.oedocarpa | Common Yellow-sedge | Cyperaceae |
| Cíb Cheanngheal | Trichophorum cespitosum | Deergrass | Cyperaceae |
| Cíb Choille | Carex sylvatica | Wood-sedge | Cyperaceae |
| Cíb Chrom | Carex pendula | Pendulous Sedge | Cyperaceae |
| Cíb Chruithneachta | Carex panicea | Carnation Sedge | Cyperaceae |
| Cíb Dhéise | Eleocharis palustris | Common Spike-rush | Cyperaceae |
| Cíb Locháin | Carex elata | Tufted-sedge | Cyperaceae |
| Cíb Dhubh | Carex nigra | Common Sedge | Cyperaceae |
| Cíb Earraigh | Carex caryophyllea | Spring Sedge | Cyperaceae |
| Cíb Fhada | Carex extensa | Long-bracted Sedge | Cyperaceae |
| Cíb Ghainimh | Carex arenaria | Sand Sedge | Cyperaceae |
| Cíb Dhosach | Carex hirta | Hairy Sedge | Cyperaceae |
| Cíb Ghobach | Carex rostrata | Bottle Sedge | Cyperaceae |
| Cíb Liathghorm | Carex flacca | Glaucous Sedge | Cyperaceae |
| Cíb Mhaol | Carex leporina | Oval Sedge | Cyperaceae |
| Cíb na Réaltaí, Cíb Réalta | Carex echinata | Star Sedge | Cyperaceae |
| Cíb Scartha | Carex remota | Remote Sedge | Cyperaceae |
| Cíb Thortógach Mhór | Carex paniculata | Greater Tussock-sedge | Cyperaceae |
| Cladhthach Mhín | Lepidium didymum | Lesser Swine-cress | Brassicaceae |
| Cluas Chait, Cailleach Bhréagach | Hypochaeris radicata | Cat's-ear | Asteraceae |
| Cluas Chaoin, Bod Gadhair | Arum maculatum | Lords-and-Ladies; Cuckoo-pint; Arum | Araceae |
| Cluas Luchóige Mhara, Liathlus Beag, Lochall Caol, Luibh na Triucha, Lus Mí, Lus na Míol, Seamair Mhuire | Cerastium fontanum | Common Mouse-ear | Caryophyllaceae |
| Cluas Luchóige Ghreamaitheach, Cluas Luchóige Fhaireogach | Cerastium glomeratum | Sticky Mouse-ear Chickweed | Caryophyllaceae |
| Cluas luchóige lomrach | Cerastium tomentosum | Snow-in-summer; Wooly Mouse-ear Chickweed | Caryophyllaceae |
| Cluas Luchóige Mhóinéir | Cerastium arvense | Field Mouse-ear | Caryophyllaceae |
| Cnáib Uisce, Scothóg Mhuire | Eupatorium cannabinum | Hemp-agrimony | Asteraceae |
| Cnó léana, Cúigmhéarach Corraigh | Comarum palustre | Marsh Cinquefoil | Rosaceae |
| Cochall | Scutellaria galericulata | Skullcap; Skull-cap | Lamiaceae |
| Cochall Beag | Scutellaria minor | Lesser Skullcap | Lamiaceae |
| Coigeal na mBan Sí, Biorrach, Bocaifín, Bodán Dubh, Bog-luachair, Boigiún Slaite, Boigrín, Curchas, Eachlasca Ban Sí, Eireaball Cait, Féith Fiáin, Fiag Fiáin | Typha latifolia | Bulrush; Reed Mace; Cat-tail; Cattail Flag; Broadleaf Cattail | Typhaceae |
| Coinnle Cora, Bú Muc, Búgha (Muc), Ceann Chorach, Cloigín Gorm, Fuath Muice, Lus na gCoinnle gCorrach, Lus na gCoinnle Gorm | Hyacinthoides non-scripta | Bluebell | Asparagaceae |
| Coinnle Corra Spáinneacha | Hyacinthoides x massartiana | Spanish Bluebell | Asparagaceae |
| Coinnle Muire | Verbascum thapsus | Great Mullein | Scrophulariaceae |
| Coinnle Oíche | Oenothera spp. | Evening-primroses | Onagraceae |
| Coirce Bréige | Arrhenatherum elatius | False Oat-grass | Poaceae |
| Coirce Clúmhach | Avenula pubescens | Downy Oat-grass | Poaceae |
| Coirce Fiáin | Avena fatua | Wild Oat | Poaceae |
| Coireán Coilleach | Silene dioica | Red campion | Caryophyllaceae |
| Coireán Mara | Silene uniflora | Sea Campion | Caryophyllaceae |
| Colaimbín | Aquilegia vulgaris | Columbine | Ranunculaceae |
| Coll, Coll | Corylus avellana | Hazel | Betulaceae |
| Compar | Symphytum officinale | Common Comfrey | Boraginaceae |
| Copóg Chatach, Copóg Sráide | Rumex crispus | Curled Dock; Curly Dock | Polygonaceae |
| Copóg Shráide | Rumex obtusifolius | Broad-leaved Dock | Polygonaceae |
| Copóg Thriopallach, Copóg Ghéar | Rumex conglomeratus | Clustered Dock; Sharp Dock | Polygonaceae |
| Copóg Uisce | Rumex hydrolapathum | Water Dock | Polygonaceae |
| Cornán Caisil, Coinneal Mhuire, Cornán Leacáin, Lamhainn-cat-leacain, Lann Cleite, Leacán, Luan Chait | Umbilicus rupestris | Navelwort | Crassulaceae |
| Corra Meille, Piseánach Searbh, Peasairín Searbh | Lathyrus linifolius | Bitter-vetch | Fabaceae |
| Corrán Lín, Cabróis, Clamhán, Cluain Lín, Corrán Croipleach, Corrán Cripleogach | Spergula arvensis | Corn Spurrey | Caryophyllaceae |
| Corrchopóg | Alisma plantago-aquatica | Water-plantain | Alismataceae |
| Corrchopóg Bheag | Baldellia ranunculoides | Lesser Water-plantain | Alismataceae |
| Crág Phortáin | Scorzoneroides autumnalis | Autumn Hawkbit | Asteraceae |
| Crág Phortáin Gharbh | Leontodon hispidus | Rough Hawkbit | Asteraceae |
| Crann Cnó Capaill | Aesculus hippocastanum | Horse Chestnut | Sapindaceae |
| Crann Creathach | Populus tremula | Aspen | Salicaceae |
| Crann Fia-úll | Malus sylvestris | Crab Apple; Crab-tree; European Crabapple | Rosaceae |
| Crann Sníofa | Salix aurita | Eared Willow | Salicaceae |
| Craobhraic, Cabáiste Faille, Cnámhlus, Craoracán, Geirgín na Trá, Griolóigín, Lus na gCnámh, Créimhric | Crithmum maritimum | Rock Samphire | Apiaceae |
| Crasal Nua-Shéalannach | Crassula helmsii | New Zealand Pigmyweed; Australian Swamp Stonecrop | Crassulaceae |
| Créachtach, Cró Dearg, Crólus, Eireaball Caitín, Lus na Síochána | Lythrum salicaria | Purple-loosestrife | Lythraceae |
| Créachtlus, Créachtlus Fáil, Créachtlus an Fháil | Stachys sylvatica | Hedge Woundwort | Lamiaceae |
| Creagach, Gob Coirre | Erodium cicutarium | Common Stork's-bill; Storkbill | Geraniaceae |
| Creamh | Allium ursinum | Ramsons; Wild Garlic | Amaryllidaceae |
| Crobh Bog | Geranium molle | Dove's-foot Crane's-bill; Dove's-foot Soft Crane's-bill | Geraniaceae |
| Crobh Cruinn | Geranium rotundifolium | Round-leaved Crane's-bill | Geraniaceae |
| Crobh Dearg | Geranium sanguineum | Bloody Crane's-bill | Geraniaceae |
| Crobh Éin | Lotus corniculatus | Common Bird's-foot-trefoil | Fabaceae |
| Crobh Éin Corraigh | Lotus pedunculatus | Greater Bird's-foot-trefoil; Large Marsh Bird's-foot-trefoil; Big Trefoil | Fabaceae |
| Crobh Geal | Geranium lucidum | Shining Crane's-bill | Geraniaceae |
| Crobh Giobach, Crobh Diosctha | Geranium dissectum | Cut-leaved Crane's-bill | Geraniaceae |
| Crobh na bhFál | Geranium pyrenaicum | Hedgerow Crane's-bill | Geraniaceae |
| Cruithneacht | Triticum aestivum | Bread Wheat | Poaceae |
| Cuach Phádraig, Cruach Phádraig, Naprún Phádraig, Cál Phádraig, Copóg Phádraig, Cró Phádraig | Plantago major | Greater Plantain; Broadleaf Plantain; Common Plantain; Rippleseed Plantain; White Man's Foot | Plantaginaceae |
| Cuaichín Dearg, Magairlín Dúdhearg | Epipactis atrorubens | Dark-red Helleborine | Orchidaceae |
| Cúig Mhéar Mhuire, Cúigeach, Cúigideach, Cúig-bhileach, Cúig-mhéarach | Potentilla reptans | Creeping Cinquefoil | Rosaceae |
| Cuileann | Ilex aquifolium | Holly | Aquifoliaceae |
| Cuileann Trá, Cuileann Duimhche | Eryngium maritimum | Sea Holly | Apiaceae |
| Cúilín Gaelach | Spiranthes romanzoffiana | Irish Lady's-tresses; Hooded Lady's-tresses | Orchidaceae |
| Cúilín Muire | Spiranthes spiralis | Autumn Lady's-tresses | Orchidaceae |
| Cuise Garbh | Poa trivalis | Rough Meadow-grass | Poaceae |
| Cuise Reatha | Poa pratensis | Smooth Meadow-grass | Poaceae |
| Cuislín gan Duaire, Créachtlus Arbhair | Stachys arvensis | Field Woundwort; Corn Woundwort | Lamiaceae |
| Cúlarán, Clórán, Cnó Arcáin, Cnó Milis, Cnó Talún, Cútharlán, Práta Cluracáin, Práta Clutharacháin, Práta Lurcáin, Práta Lutharacháin | Conopodium majus | Pignut | Apiaceae |
| Dair Ghaelach, Dair Neamhghasánach | Quercus petraea | Sessile Oak; Cornish Oak | Fagaceae |
| Dair Ghallda | Quercus robur | Pendunculate Oak | Fagaceae |
| Dáthabha Bán, Tréanlus Braonach | Oenanthe crocata | Hemlock Water-dropwort | Apiaceae |
| Dáthabha Giolcaí | Oenanthe fistulosa | Tubular Water-dropwort | Apiaceae |
| Dearg Faille, Madar Dearg | Sherardia arvensis | Field Madder | Rubiaceae |
| Dearna Mhuire | Alchemilla mollis | Garden Lady's-mantle | Rosaceae |
| Dédhuilleog | Neottia ovata | Common Twayblade | Orchidaceae |
| Donnlus, Donnlus Cnapánach, Fothrom | Scrophularia nodosa | Common Figwort | Scrophulariaceae |
| Donnlus Uisce, Samhadh Corraigh, Samhadh Feárna | Scrophularia auriculata | Water Figwort | Scrophulariaceae |
| Draighean, Máthair an Áirne, Crann Áirní | Prunus spinosa | Blackthorn | Rosaceae |
| Draighean Fearna | Frangula alnus | Alder Buckthorn | Rhamnaceae |
| Draighean Mara | Hippophae rhamnoides | Sea-Buckthorn | Elaeagnaceae |
| Dréimire Buí | Blackstonia perfoliata | Yellow-wort | Gentianaceae |
| Dréimire Mhuire, Céad Duilleach, Crobhán Muire | Centaurium erythraea | Common Centaury | Gentianaceae |
| Ruithéal Rí, Crobh Dearg, Crólus Dearg, Eireaball Rí, Ruithéal Rí | Geranium robertianum | Herb Robert | Geraniaceae |
| Dris, Driseog, Dreas, Drisleog, Pras, Preas, Sceach Talún, Sméardhris, Dreasóg | Rubus fruticosus | Bramble; Blackberry Bush | Rosaceae |
| Drúchtín Móna, Galar na gCat, Lus na Fearnaighe, Rós an tSolais | Drosera rotundifolia | Round-leaved Sundew; Common Sundew | Droseraceae |
| Duán Ceannchosach, Duáinín an tSeanchais, Ceannbhán Beag, Duán Donn, Lus Croí, Sásadh-na-croí, Tae an Chnoic, Tae Maide, Tae na gCailleach, Tae na nGarraithe, Tae na nGarrantaí, Ceannramán na Dubhchoise | Prunella vulgaris | Selfheal | Lamiaceae |
| Duán na gCaorach | Jasione montana | Sheep's-bit; Sheep's scabious | Campanulaceae |
| Duilleog Bhríde, Duilleog Mhaith, Duilleog Mhín | Lapsana communis | Nipplewort | Asteraceae |
| Dúmheidic | Medicago lupulina | Black Medic | Fabaceae |
| Ealabairín | Epipactis helleborine | Broad-leaved Helleborine | Orchidaceae |
| Eibheann, Eidheann, Eibheann, Eidhneán, Aighneán, Feidhneán, Iashlat, Eidhneachán | Hedera hibernica/Hedera Helix | Ivy | Araliaceae |
| Eibheann Bhostúin | Parthenocissus tricuspidata | Boston Ivy | Vitaceae |
| Eilifleog Chaol, Praiseach Mhín, Eilifleog Choiteann | Atriplex patula | Common Orache | Chenopodiaceae |
| Eilifleog leathan, Praiseach Mhín | Atriplex prostrata | Spear-leaved Orache; Broad-leaved Orache | Chenopodiaceae |
| Eilifleog Phlúrach | Atriplex laciniata | Frosted Orache | Chenopodiaceae |
| Eirigearán Ceanadach | Erigeron canadensis | Canadian Fleabane | Asteraceae |
| Eithreog | Rubus caesius | Dewberry | Rosaceae |
| Falcaire Corraigh | Lysimachia tenella | Bog Pimpernel | Primulaceae |
| Falcaire Fiáin, Falcaire Fuar, Glanrosc (Corcaigh), Luibh na Muc, Rinnrosc, Ruinnrosc, Sailín Cuach, Seamair Mhuire | Lysimachia arvensis | Scarlet Pimpernel | Primulaceae |
| Falcaire Uisce | Samolus valerandi | Brookweed | Primulaceae |
| Feá | Fagus sylvatica | Beech | Fagaceae |
| Feabhráid Reatha | Parietaria judaica | Pellitory-of-the-wall; Spreading Pellitory | Urticaceae |
| Feabhrán, Faidhf na Madaí, Fiúran, Fleabhrán, Fuarán, Gleorán, Odhrán, Pleascán, Dorán | Heracleum sphondylium | Hogweed | Apiaceae |
| Feabhrán Capaill, Ollfheabhrán | Heracleum mantegazzianum | Giant Hogweed | Apiaceae |
| Féar an Chinn Bháin | Holcus lanatus | Yorkshire Fog; Tufted Grass; Meadow Soft Grass | Poaceae |
| Féar Caoráin | Danthonia decumbens | Heath-grass | Poaceae |
| Féar Capaill, Tiomóid | Phleum pratense | Timothy; Cat’s-tail Grass; Timothy-grass; Cat’s-tail | Poaceae |
| Féar Cumhra | Anthoxanthum odoratum | Sweet Vernal-grass | Poaceae |
| Féar Gortach | Briza media | Quaking-grass | Poaceae |
| Féar Muirisce | Puccinellia maritima | Common Saltmarsh-grass | Poaceae |
| Féar Pampas | Cortaderia selloana | Pampas-grass | Poaceae |
| Fearbán Féir, Fearbán Léana, Gairgín | Ranunculus acris | Meadow Buttercup; Common Buttercup | Ranunculaceae |
| Fearbán Reatha | Ranunculus repens | Creeping Buttercup | Ranunculaceae |
| Fearnóg | Alnus glutinosa | Alder | Betulaceae |
| Fearnóg Iodálach | Alnus cordata | Italian Alder | Betulaceae |
| Fearnóg Liath | Alnus incana | Grey Alder | Betulaceae |
| Feascarlus | Hesperis matronalis | Dame's-violet | Brassicaceae |
| Feilistrín Buí | Sisyrinchium californicum | Yellow-eyed Grass | Iridaceae |
| Feilistrín Gorm, Féar Súilghorm | Sisyrinchium bermudiana | Blue-eyed Grass | Iridaceae |
| Feirdhris | Rosa canina | Dog-rose | Rosaceae |
| Féithleann Álainn | Leycesteria formosa | Himalayan Honeysuckle | Caprifoliaceae |
| Féithleog, Táthfhéithleann, Féithleann, Bainne Gamhna, Cas Fá Chrann, Duilleabhar Féarána, Feath, Féith, Féithleog (Fá Chrann), Iashlat, Luibh Féarána, Lus na Meala, Mil Ghabhair, Tromán na hAbhna, Crann Sníomha, Duilleabhar Féithle | Lonicera periclymenum | Honeysuckle | Caprifoliaceae |
| Feochadán Mín | Carlina vulgaris | Carline Thistle | Asteraceae |
| Feorainn Mhín, Beinteach Choiteann | Agrostis capillaris | Common Bent | Poaceae |
| Feorán Corraigh | Lycopus europaeus | Gypsywort | Lamiaceae |
| Feoras, Crann Feorais | Euonymus europaeus | Spindle | Celastraceae |
| Feoras Seapánach, Crann Feorais | Euonymus japonicus | Japanese Spindle Tree | Celastraceae |
| Fiastalach, Luachair Bhláthghéar | Juncus acutiflorus | Sharp-flowered Rush | Juncaceae |
| Fincín Mór | Vinca minor | Lesser Periwinkle | Apocynaceae |
| Fincín Mór | Vinca major | Greater Periwinkle | Apocynaceae |
| Finéal | Foeniculum vulgare | Fennel | Apiaceae |
| Finidí na Muc, Féasóg Ghabhair, Gabhar-ulcha | Tragopogon pratensis | Goat's-beard | Asteraceae |
Finiún Rúiseach,
| Fallopia baldschuanica | Russian Vine, Bukhara Fleeceflower, Chinese Fleecevine, Mile-a-minute, Silver Lace Vine
| Polygonaceae |
| Fionnán, Fiataíl | Molinia caerulea | Purple Moor-grass | Poaceae |
| Fionncholl, Fionncholl Coiteann, Bíoma Bán | Sorbus aria | Whitebeam; Common Whitebeam | Rosaceae |
| Fionncholl Gaelach | Sorbus hibernica | Irish Whitebeam | Rosaceae |
| Fionnscoth | Parnassia palustris | Grass of Parnassus | Celastraceae |
| Fiúise | Fuchsia magellanica | Fuchsia | Onagraceae |
| Flíoch, Flig, Fliodh, Flíoch, Fuilig, Luibh na bhFranncach, Luibh na Triucha, Seamair Mhuire | Stellaria media | Common Chickweed; Chickweed | Caryophyllaceae |
| Fliodh Uisce | Montia fontana | Blinks; Water Chickweed | Montiaceae |
| Fóthnán Colgach, Feochadán Colgach | Cirsium vulgare | Spear Thistle | Asteraceae |
| Fóthnán Corraigh, Feochadán Corraigh | Cirsium palustre | Marsh Thistle | Asteraceae |
| Fóthnán Móna, Feochadán Móna | Cirsium dissectum | Meadow Thistle | Asteraceae |
| Fóthnán Reatha, Feochadán Reatha, Feochadán Fireann | Cirsium arvense | Creeping Thistle | Asteraceae |
| Franclus, Tansae, Lus na bhFrancach | Tanacetum vulgare | Tansy | Asteraceae |
| Fraoch Camógach | Erica erigena | Irish Heath | Ericaceae |
| Fraoch Cloigíneach, Fraoch Coitianta, Fraoch Corcra, Fraoch Dearg, Fraoch Éireann | Erica cinerea | Bell Heather | Ericaceae |
| Fraoch Mór, Fraoch na Lochlannach | Calluna vulgaris | Common Heather | Ericaceae |
| Fraoch na hAon Choise, Fraoch Camógach | Daboecia cantabrica | St Dabeoc's Heath; Irish Heath; Connemara Heath | Ericaceae |
| Fraoch Naoscaí, Fraoch ar Inse | Erica tetralix | Cross-leaved Heath | Ericaceae |
| Fraochóg, Fraochán, Tom Fraochán, Breileog, Broileog, Dearc Fraoigh, Lusra na bhFraochán, Mónadán, Mónann, Mónarán | Vaccinium myrtillus | Bilberry; Whortleberry; European Blueberry | Ericaceae |
| Fuath Gorm, Dréimire Gorm, Searbhóg Milis | Solanum dulcamara | Bittersweet, Woody Nightshade | Solanaceae |
| Fuinseagach | Circaea lutetiana | Enchanter's-nightshade | Onagraceae |
| Fuinseog | Fraxinus excelsior | Ash | Oleaceae |
| Ga Buí Scoiltliopach | Galeopsis bifida | Bifid Hemp-nettle; Splitlip Hempnettle; Split-lip Hemp-nettle | Lamiaceae |
| Gabhrán | Clematis vitalba | Traveller's-joy; Old Man's Beard; Clematis | Ranunculaceae |
| Gaineamhlus Earraigh, Lus Gainimh an Earraigh | Sabulina verna | Spring Sandwort | Caryophyllaceae |
| Gaineamhlus Mara, Lus an Ghainimh | Honckenya peploides | Sea Sandwort | Caryophyllaceae |
| Gallfheabhrán, Gunna Pléascáin, Pléascán Mór | Angelica sylvestris | Wild Angelica | Apiaceae |
| Garbhán Creagach | Saponaria officinalis | Soapwort | Caryophyllaceae |
| Garbhfhéar | Dactylis glomerata | Cock's-foot | Poaceae |
| Garbhlus, Garbhach, Lus Garbh, Uirlis Chríonna, Airmeirg, Airnéisí, Briosclán, Caolfhail, Sop an tSéaláin, Sop Séaláin, Uirlis Chríonna | Galium aparine | Cleavers; Goosegrass; Robin-run-the-hedge | Rubiaceae |
| Garbhlus na Boirne, Madar | Rubia peregrina | Wild Madder | Rubiaceae |
| Gearr Nimhe | Euphorbia peplus | Petty Spurge | Euphorbiaceae |
| Geathar Buí | Lysichiton americanus | American Skunk-cabbage | Araceae |
| Geranium x oxonianum | Geranium x oxonianum | Druce's Crane's-bill | Geraniaceae |
| Giolcach, Biorrach, Biorrach Laighean, Biorrach Lachan, Crúiscearnach, Cuilc, Curchas, Gáinne, Lachán, Sifín, Simhean | Phragmites australis | Common Reed | Poaceae |
| Giolgach Shléibhe | Cytisus scoparius | Broom | Fabaceae |
| Giúnach Léana | Luzula campestris | Field Wood-rush | Juncaceae |
| Giúnach Mór, Ollghiúnach | Luzula sylvatica | Great Wood-rush | Juncaceae |
| Glanrosc, Rinn Roisc, Caoimín, Glanruisc, Líon Radhairc, Lus an Phápa, Lus na Leac, Radhaircín, Rinnrosc, Roisnín, Rosc, Ruinnrosc, Soilse na Súl | Euphrasia officinalis | Eyebright | Orobanchaceae |
| Glanrosc Gaelach | Euphrasia salisburgensis | Irish Eyebright | Orobanchaceae |
| Glasair Choille | Ajuga reptans | Bugle | Lamiaceae |
| Glasair Léana Bheag, Glasair Léana, Lasair Léana | Ranunculus flammula | Grass-leaved Buttercup | Ranunculaceae |
| Glasair Léana Mhór | Ranunculus lingua | Greater Spearwort; Great Spearwort | Ranunculaceae |
| Glaschreamh | Allium triquetrum | Three-cornered Garlic | Amaryllidaceae |
| Gliográn, Bodach Gliogair | Rhinanthus minor | Yellow-rattle | Orobanchaceae |
| Glóiris | Chrysosplenium oppositifolium | Opposite-leaved Golden-saxifrage; Golden-saxifrage | Saxifragaceae |
| Glúineach an Chlúimh | Koenigia campanulata | Lesser Knotweed | Polygonaceae |
| Glúineach Bheag, Féar Altach, Féar Glúiníneach | Polygonum aviculare | Knotgrass; Knot-grass | Polygonaceae |
| Glúineach Bhiorach | Reynoutria japonica | Japanese Knotweed | Polygonaceae |
| Glúineach Dhearg | Persicaria maculosa | Redshank; Lady's Thumb; Common Persicaria; Spotted Lady's Thumb | Polygonaceae |
| Glúineach Dhubh | Fallopia convolvulus | Black Bindweed | Polygonaceae |
| Glúineach Spíceach | Koenigia polystachya | Himalayan Knotweed | Polygonaceae |
| Glúineach Uisce | Persicaria amphibia | Amphibious Bistort; Scarlet Smartweed; Water Knotweed | Polygonaceae |
| Gnamhlus Corraigh, Cáithluibh Chorraigh | Gnaphalium uliginosum | Marsh Cudweed | Asteraceae |
| Gobsheisc | Rhynchospora alba | White Beak-sedge | Cyperaceae |
| Grafán Bán na gCloch | Sedum album | White Stonecrop | Crassulaceae |
| Grafán na gCloch | Sedum acre | Biting Stonecrop; Wall-pepper; Yellow Stonecrop | Crassulaceae |
| Grán Arcáin, Aonscoth, Lus na nCnapán | Ficaria verna | Lesser Celandine | Ranunculaceae |
| Grianrós Liath, Rós Carraige | Helianthemum oelandicum | Hoary Rock-rose | Cistaceae |
| Grúnlas, Buafanán na hEascarann, Crannlus, Gránlus, Gronnlus | Senecio vulgaris | Groundsel | Asteraceae |
| Gunna Uisce, Biolar Bréige | Apium nodiflorum | Fool's Water-cress; Water Celery | Apiaceae |
| Gunnaire | Gunnera tinctoria | Giant-rhubarb; Chilean Rhubarb | Gunneraceae |
| Hocas Ard | Malva arborea | Tree-mallow | Malvaceae |
| Hocas Muscach | Malva moschata | Musk-mallow | Malvaceae |
| Hocas Tae | Odontites vernus | Red Bartsia | Orobanchaceae |
| Ialus Fáil, Ialus Mór, Crann Sníomha | Calystegia sepium | Hedge Bindweed | Convolvulaceae |
| Iúr, Crann Iubhair, Eo | Taxus baccata | Yew, Common Yew, European Yew | Taxaceae |
| Iúr Sléibhe, Sáiste Choille, Ceannbhán Cinn Coille, Sáiste Chnoic, Sáiste Fiáin, Sáiste Muice | Teucrium scorodonia | Wood Sage | Lamiaceae |
| Labhras Siliní | Prunus laurocerasus | Cherry Laurel | Rosaceae |
| Lachán na nDamh, Fiastulach, Fiastalach, Gabhal-luachair | Juncus articulatus | Jointed Rush | Juncaceae |
| Laíon na Trá | Beta vulgaris ssp maritima | Sea Beet; Sea Spinach | Amaranthaceae |
| Leadán, Cnádán, Copóg Thuathail, Leadán Liosta, Crádán, Leadán an Úcaire, Meacan Tua, Min-bhriúgail, Tobha, Tua, Tuabhal, Tuafal | Arctium minus | Lesser Burdock; Burdock | Asteraceae |
| Leadán Úcaire | Dipsacus fullonum | Teasel, Wild Teasel | Caprifoliaceae |
| Leaithín, Féasóg na Lao | Dryas octopetala | Mountain Avens | Rosaceae |
| Leamhach | Althaea officinalis | Marsh Mallow; Marshmallow | Malvaceae |
| Léine Mhuire, Biolar Gréagáin, Searbh-bhiolar, Glasair Léana, Gleorán, Glórán, Lasair Léana, Lus na mBan, Seilín Cuaiche | Cardamine pratensis | Cuckoo Flower; Lady's-smock | Brassicaceae |
| Leith Uisce, Bodán Meascáin | Pinguicula vulgaris | Common Butterwort | Lentibulariaceae |
| Leith Uisce Bheag | Pinguicula lusitanica | Pale Butterwort | Lentibulariaceae |
| Leitís Bhalla | Mycelis muralis | Wall Lettuce | Asteraceae |
| Liach Bhríde, Duileasc Abhann Leathan, Liach Roide | Potamogeton natans | Broad-leaved Pondweed | Potamogetonaceae |
| Liach Mhóna, Duileasc Abhann Móna | Potamogeton polygonifolius | Bog Pondweed | Potamogetonaceae |
| Liath na Trá | Artemisia maritima | Sea Wormwood | Asteraceae |
| Líon na Nua-Shéalainne | Phormium tenax | New Zealand Flax | Lilaceae |
| Luachair Bhleibeach | Juncus bulbosus | Bulbous Rush | Juncaceae |
| Luachair Bhog, Geataire, Fidheog, Geaftaire, Luachair Ghallda | Juncus effusus | Soft Rush | Juncaceae |
| Luachair Chaoráin | Juncus squarrosus | Heath Rush | Juncaceae |
| Luachair Dhlúth | Juncus conglomeratus | Compact Rush | Juncaceae |
| Luachair Mhuirisce, Luachair Réisc Goirt | Juncus gerardii | Saltmarsh Rush | Juncaceae |
| Luibh an Chiorraithe | Hypericum elodes | Marsh St Johns'-wort | Hypericaceae |
| Luibh Bhléine | Tripolium pannonicum | Sea Aster; Sea Starwort | Asteraceae |
| Luibh na bhFear Gonta | Galium saxatile | Heath Bedstraw | Rubiaceae |
| Lus an Bhainne, Glúineach, Lus na Seacht mBua | Polygala vulgaris | Common Milkwort | Polygalaceae |
| Lus an Bhalla | Erysimum cheiri | Wallflower | Brassicaceae |
| Lus an Chromchinn, Lus an aisig | Narcissus spp. | Daffodil | Amaryllidaceae |
| Lus an Chrúbáin | Gentianella campestris | Field Gentian | Gentianaceae |
| Lus an Easpaig | Aegopodium podagria | Ground-elder; Goutweed; Bishop's Weed | Apiaceae |
| Lus an Ghaill | Atriplex portulacoides/Halimione portulacoides | Sea Purslane | Chenopodiaceae |
| Lus an Ghiolla | Pedicularis sylvatica | Heath Lousewort | Orobanchaceae |
| Lus an Óir, Taithigín Taibhseach (NMC) | Sisymbrium officinale | Hedge Mustard | Brassicaceae |
| Lus an Sparáin, Lus na nAosán, Lus na Fola | Capsella bursa-pastoris | Shepherd's-purse | Brassicaceae |
| Lus an tSagairt | Melampyrum pratense | Common Cow-wheat | Orobanchaceae |
| Lus an tSailte, Lus Bainne Mara | Lysimachia maritima | Sea-milkwort | Primulaceae |
| Lus Bealtaine Mara, Lus Bealtaine, Lus Bhealtaine Mara | Tripleurospermum maritimum | Sea Mayweed | Asteraceae |
| Lus borraigh beag, Lus an Bhorraigh Beag | Utricularia minor | Lesser Bladderwort | Lentibulariaceae |
| Lus Braonach | Filipendula vulgaris | Dropwort | Rosaceae |
| Lus Buí Bealtaine | Caltha palustris | Marsh-marigold | Ranunculaceae |
| Lus Buí Mhanannáin | Hypericum calycinum | Rose-of-Sharon | Hypericaceae |
| Lus Buí na nDreancaidí | Pulicaria dysenterica | Common Fleabane | Asteraceae |
| Lus Cholm Cille | Lysimachia nemorum | Yellow Pimpernel | Primulaceae |
| Lus Corráin | Achillea ptarmica | Sneezewort | Asteraceae |
| Lus Cré, Lus Cré Coiteann, Seamair Chré | Veronica officinalis | Heath Speedwell; Common Speedwell | Plantaginaceae |
| Lus Cré Balla | Veronica arvensis | Wall Speedwell | Plantaginaceae |
| Lus Cré Coille | Veronica montana | Wood Speedwell | Plantaginaceae |
| Lus Cré Corraigh | Veronica scutellata | Marsh Speedwell | Plantaginaceae |
| Lus Cré Eidhneach | Veronica hederifolia | Ivy-leaved Speedwell | Plantaginaceae |
| Lus Cré Garraí, Lus Cré Réileán | Veronica persica | Common Field-speedwell; Persian Speedwell | Plantaginaceae |
| Lus Cré Réileán | Veronica filiformis | Slender Speedwell; Creeping Speedwell | Plantaginaceae |
| Lus Cré Talún, Anuallach, Lusán Balla, Lus na mBanaltran | Veronica chamaedrys | Germander Speedwell | Plantaginaceae |
| Lus Cúráin Gobach | Crepis vesicaria | Beaked Hawk's-beard | Asteraceae |
| Lus Cúráin Mín | Crepis capillaris | Smooth Hawk's-beard | Asteraceae |
| Lus Deartán | Tanacetum parthenium | Feverfew | Asteraceae |
| Lus Liath na Mara | Limonium humile | Lax-flowered Sea Lavender | Plumbaginaceae |
| Lus Míonla Buí | Myosotis discolor | Changing Forget-me-not | Boraginaceae |
| Lus Míonla Goirt, Lus Míonla Coiteann | Myosotis arvensis | Field Forget-me-not | Boraginaceae |
| Lus Moileas, Lus Molach | Galium odoratum | Woodruff | Rubiaceae |
| Lus na bhFaithní | Euphorbia helioscopia | Sun Spurge | Euphorbiaceae |
| Lus na Gloine | Salicornia spp | Glasswort species | Chenopodiaceae |
| Lus na haincise | Asperula cynanchica | Squinancywort | Rubiaceae |
| Lus na hIothlann, Lus Anainn | Matricaria discoidea | Pineappleweed; Rayless Mayweed | Asteraceae |
| Lus na Maighdine Muire | Hypericum perforatum | Perforate St John's-wort | Hypericaceae |
| Lus na mBan Sí, Líon na mBan Sí, Mionsach, Bú, Caolach, Líon Beag, Líon Purgóideach, Míonbhach, Míonsach, Míosach, Míseach, Miúnsach | Linum catharticum | Fairy Flax; Purging Flax; Cathartic Flax | Linaceae |
| Lus na Meall Muire, Hocas | Malva sylvestris | Common Mallow | Malvaceae |
| Lus na nDeor | Soleirolia soleirolii | Mind-your-own-business | Urticaceae |
| Lus na Pingine | Hydrocotyle vulgaris | Marsh Pennywort; Common Pennywort; Water Navel | Apiaceae |
| Lus na Pléisce, Balsam Himiléach | Impatiens glandulifera | Indian Balsam; Himalayan Balsam | Balsaminaceae |
| Lus na Stalóg | Arctostaphylos uva-ursi | Bearberry | Ericaceae |
| Lus na Tine, Saileachán Francach, Lus Tine | Chamaenerion angustifolium | Rosebay Willowherb; Fireweed | Onagraceae |
| Lus na Treacha | Veronica serpyllifolia | Thyme-leaved Speedwell | Plantaginaceae |
| Lus na Tríonóide, Saileachán Mór | Epilobium hirsutum | Great Willowherb | Onagraceae |
| Lus Síoda, Plúr na Cuaiche | Silene flos-cuculi | Ragged-robin | Caryophyllaceae |
| Lus Taghla | Gymnadenia conopsea | Fragrant Orchid; Chalk Fragrant Orchid | Orchidaceae |
| Lusrán Grándubh | Smyrnium olusatrum | Alexanders | Apiaceae |
| Macall Coille, Beinidín, Beinidín Fiáin | Geum urbanum | Wood Aven | Rosaceae |
| Macall Uisce | Geum rivale | Water Avens | Rosaceae |
| Magairlín an Loscáin | Dactylorhiza viridis | Frog Orchid | Orchidaceae |
| Magairlín Beag an Fhéileacáin, Magairlín Beag Féileaceánach | Platanthera bifolia | Lesser Butterfly Orchid | Orchidaceae |
| Magairlín Féitheach | Anacamptis morio | Green-winged Orchid | Orchidaceae |
| Magairlín Gaelach | Dactylorhiza majalis | Irish Marsh-orchid | Orchidaceae |
| Magairlín Meidhreach | Orchis mascula | Early-purple Orchid | Orchidaceae |
| Magairlín Mór, Magairlín Álainn, Magairlín Mór, Magairlín Mór an Chorraigh | Dactylorhiza incarnata | Early Marsh-Orchid; Flecked Marsh-Orchid | Orchidaceae |
| Magairlín na mBeach, Magairlín Beachach | Ophrys apifera | Bee Orchid | Orchidaceae |
| Magairlín na Míoltóg, Magairlín na gCuileann | Ophrys insectifera | Fly Orchid | Orchidaceae |
| Magairlín na Móna | Hammarbya paludosa | Bog Orchid | Orchidaceae |
| Barr an Mhilltigh Mara | Anacamptis pyramidalis | Pyramidal Orchid | Orchidaceae |
| Mailp | Acer campestre | Field Maple | Sapindaceae |
| Máirtín Fiáin, Oragán | Origanum vulgare | Oregano; Wild Marjoram | Lamiaceae |
| Marbhdhraighean, Airgeadán, Méirnín na Má, Tae Fiáin, Géar-bhileach | Agrimonia eupatoria | Agrimony | Rosaceae |
| Meá Drua, Lus Bhealtaine | Tripleurospermum inodorum | Scentless Mayweed | Asteraceae |
| Meacan Mara | Raphanus raphanistrum fosp. maritimus | Sea Radish | Brassicaceae |
| Meacan Raidigh, Corrán Dearg | Raphanus raphanistrum fosp. raphanistrum | Wild Radish | Brassicaceae |
| Mealbhacán, Bliúcán, Cuirdín, Cuirdín Fiáin, Bleamhacán, Crallacóg, Milbheacán, Miodhlucán, Muadhonn, Mugomán, Coirnín, Curadáin | Daucus carota | Wild Carrot | Apiaceae |
| Méara Muire, Cosán, Cúig Mhéar Muire | Anthyllis vulneraria | Kidney Vetch | Fabaceae |
| Méaracán an Phúca, Méaracán Dearg, Lus Mór, Méirín Dearg, Méirín Púca, Creaics, Féirín Sí, Lus Mór Baineann, Lus na mBan Sí, Maide Méaracán, Méaracán an Diabhail, Méaracán Daoine Marbh, Méaracán na mBan Sí, Méaracán Sí, Méiríní Púca, Méiríní Madra Rua, Sian Sléibhe, Sídhean Sléibhe, Síodhan Sléibhe | Digitalis purpurea | Foxglove | Plantaginaceae |
| Méaracán Gorm, Corrach na Cuaiche, Méaracán Púca | Campanula rotundifolia | Harebell; Scottish Bluebell | Campanulaceae |
| Meas Torc Allta, Meas Torc Allaidh, Úll an Mhadra Rua | Hypericum androsaemum | Tutsan | Hypericaceae |
| Meathán Mara | Juncus maritimus | Sea Rush | Juncaceae |
| Méirín Sí | Erinus alpinus | Fairy Foxglove | Plantaginaceae |
| Milseán móna | Pedicularis palustris | Marsh Lousewort | Orobanchaceae |
| Mín Scoth, Bata Cogaidh, Brealla Gorma, Mullach Dubh, Cnapán Dubh, Ceanna Dubha, Bodach Dubh, Cnaipe Dubha, Fonnscoth, Nianscoth, Tobac Capaill | Centaurea nigra | Knapweed; Blackhead | Asteraceae |
| Mínscoth Mhór | Centaurea scabiosa | Greater Knapweed | Asteraceae |
| Mionfhéar Luath | Aira praecox | Early Hair-grass | Poaceae |
| Mismín Arbhair, Miontas Arbhair | Mentha arvensis | Corn Mint; Field Mint | Lamiaceae |
| Mismín Mionsach, Mismín Dearg, Cartlainn, Mismín Uisce, Miontas Uisce | Mentha aquatica | Water Mint; Bog Mint | Lamiaceae |
| Mongach Meisce, Liathlus | Artemisia vulgaris | Mugwort | Asteraceae |
| Mongán Glúineach, Lus na bPéarlaí Nódach | Sagina nodosa | Knotted Pearlwort | Caryophyllaceae |
| Mongán Móna | Sagina subulata | Heath Pearlwort | Caryophyllaceae |
| Mongán Sínte, Lus na bPéarlaí Sínte | Sagina procumbens | Procumbent Pearlwort | Caryophyllaceae |
| Mórán Balla | Saxifraga tridactylites | Rue-leaved Saxifrage | Saxifragaceae |
| Mórán Gaelach | Saxifraga rosacea | Irish Saxifrage | Saxifragaceae |
| Muilcheann | Gentianella amarella | Autumn Gentian | Gentianaceae |
| Muiléad coille | Milium effusum | Wood Millet | Poaceae |
| Muiríneach | Ammophila arenaria | Marram; Marram Grass; European Beachgrass | Poaceae |
| Na Brídeacha | Spiraea spp. | Bridewort | Rosaceae |
| Na Circíní, Circín, Nuacht Bhallach an Chaoráin, Cearc Bhreac, Cailleach Bhreac, Cailleach Bhréagach | Dactylorhiza maculata | Heath Spotted-orchid | Orchidaceae |
| Na Deirfiúiríní | Polygala serpyllifolia | Heath Milkwort | Polygalaceae |
| Nead Choille, Lus na Gaoithe | Anemone nemorosa | Wood Anemone | Ranunculaceae |
| Néal Uisce Eidhneach | Ranunculus hederaceus | Ivy-leaved Crowfoot | Ranunculaceae |
| Néalfartach, Niamhnaid, Léanartach, Lus an Chodlata, Neamhain, Neamhnaid, Néanfhartach | Potentilla erecta | Tormentil | Rosaceae |
| Neantóg, Cál Faiche, Coll Faiche, Cúl Fáich, Cúl Faiche, Cúl Fáidh, Neannta | Urtica dioica | Nettle | Urticaceae |
| Nóinín Balla | Erigeron karvinskianus | Mexican Fleabane | Asteraceae |
| Nóinín Coiteann, Nóinín Beag Dearg, Nóinín Mada | Bellis perennis | Common Daisy | Asteraceae |
| Nóinín Mór, Easpagán, Easpag Speatháin, Bán Mór, Bó Dhonn, Bréanán Brothach, Bréineán Breothach, Easpag Bán, Easpag Baoch, Easpag Speáin | Leucanthemum vulgare | Ox-eye Daisy | Asteraceae |
| Nuacht Bhallach, Nuacht Bhallach Coiteann, Nuaíocht Bhallach Coiteann, Cailleach Bhréagach, Cailleach Bhéara | Dactylorhiza fuchsii | Common Spotted-orchid | Orchidaceae |
| Nuacht Bhallach Uí Cheallaigh | Dactylorhiza fuchsii fosp. okellyi | O'Kelly's Spotted-orchid | Orchidaceae |
| Odhrach Bhallach, Greim an Diabhail, Buarach Bhallach, Caisearbhán Beag, Greim an Deamhain, Odhrach Mullach, Úrach Bhallach, Úrach Mullaigh, Ceannramán Dubhchosach | Succisa pratensis | Devil's-bit Scabious | Caprifoliaceae |
| Paide Bréan | Rhamnus cathartica | Buckthorn | Rhamnaceae |
| Peasair Arbhair, Cogal | Vicia hirsuta | Hairy Tare | Fabaceae |
| Peasair Chapaill, Pis Chapaill, Pis Dhubh, Pis Bhreacáin, Piseánach Coitianta, Piseánach na mBreas, Siorralach | Vicia sativa | Common Vetch | Fabaceae |
| Peasair Fhiáin | Vicia sepium | Bush Vetch | Fabaceae |
| Peasair na Luch | Vicia cracca | Tufted Vetch; Bird Vetch; Cow Vetch | Fabaceae |
| Peasairín Buí, Piseánach Buí, Pis Bhuí, Piseánach na gCapall | Lathyrus pratensis | Meadow Vetchling | Fabaceae |
| Péine Albanach | Pinus sylvestris | Scot's Pine | Pinaceae |
| Péine Contórtach | Pinus contorta | Lodgepole Pine; Shore Pine | Pinaceae |
| Péine Monterey | Pinus radiata | Monterey Pine | Pinaceae |
| Peirsil Bhó, Pearsáil, Cos Uisce | Anthriscus sylvestris | Cow Parsley | Apiaceae |
| Pibín Uisce, Lus an Phíopa | Eriocaulon aquaticum | Pipewort | Eriocaulaceae |
| Púirín Sneachta | Galanthus nivalis | Snowdrop | Amaryllidaceae |
| Plúr an Locháin | Lobelia dortmanna | Water Lobelia | Campanulaceae |
| Plúr an Phrionsa | Calystegia soldanella | Sea Bindweed | Convolvulaceae |
| Plúr na Gréine | Petasites pyrenaicus | Winter Heliotrope | Asteraceae |
| Poibleog Dhubh Atlantaigh | Populus nigra betulifolia | Atlantic Black Poplar | Salicaceae |
| Poibleog Dhubh Hibrideach | Populus x canadensis | Hybrid Black Poplar | Salicaceae |
| Poibleog Gheal | Populus alba | Silver Poplar, White Poplar | Salicaceae |
| Poibleog Liath | Populus x canescens | Grey Poplar | Salicaceae |
| Póirín Sneachta | Symphoricarpos albus | Snowberry | Caprifoliaceae |
| Póiríní Seangán | Sedum anglicum | English Stonecrop | Crassulaceae |
| Praiseach Bhuí, Lus na Súl Buí, Braiste, Corrán Buí, Garbhán Bodaigh, Garbhóg, Nóinín Buí, Praiseach Gharbh, Súil Bhuí, Cál Gortach | Sinapis arvensis | Charlock | Brassicaceae |
| Praiseach Dhubh, Mustard Dubh | Brassica nigra | Black Mustard | Brassicaceae |
| Praiseach Thrá | Crambe maritima | Sea-kale; Sea Kale | Brassicaceae |
| Pribhéad | Ligustrum vulgare | Privet | Oleaceae |
| Pribhéad Calafoirniach | Ligustrum ovalifolium | California Privet; Garden Privet | Oleaceae |
| Rabhán, Caoróg Mhara, Cíob Trá, Murrathach, Nóinín an Chladaigh, Rosc, Tonn an Chladaigh | Armeria maritima | Thrift; Sea-pink; Sea Cushion | Plumbaginaceae |
| Ráib | Brassica napus | Rape; Oil Seed Rape | Brassicaceae |
| Réiltín Uisce | Callitriche stagnalis | Common Water-starwort; Mud Water-starwort | Plantaginaceae |
| Rísheisc, Rísheisc Chraobhach | Sparganium erectum | Branched Bur-reed | Typhaceae |
| Roithleog, Railleog, Cam-shaileog, Raid, Raidleog, Reileog, Rideog, Roidleog, Roilleog, Roithleog, Ruideog, Rudóg, Truideogach, Raideog | Myrica gale | Bog-myrtle | Myricaceae |
| Ros Lachan | Lemna minor | Common Duckweed | Araceae |
| Rós Rúscach | Rosa rugosa | Japanese Rose | Rosaceae |
| Róslabhras, Ródaideandrón Fiáin | Rhododendron ponticum | Rhododendron; Wild Rhododendron | Ericaceae |
| Rú Corraigh, Rú Corraigh Mór | Galium palustre | Common Marsh-bedstraw; Great Marsh-bedstraw | Rubiaceae |
| Rú Crua | Galium boreale | Northern Bedstraw | Rubiaceae |
| Rú Léana | Thalictrum flavum | Common Meadow-rue | Ranunculaceae |
| Ruachán Buí | Diplotaxis muralis | Annual Wall-rocket | Brassicaceae |
| Sabhaircín, Bainne Bó Bleachtáin, Béacán, Buíocán, Padhacán, Péacán (Buí), Peidhceán, Peidhreacán, Sabhaircín, Sabharcán, Sadharclann, Samhaircín, Seibhirín, Seimhirín, Sobhaircín, Sobharcán, Sobhrach, Soibhircín | Primula vulgaris | Common Primrose | Primulaceae |
| Sábhsheisc | Cladium mariscus | Great Fen-sedge; Saw Sedge | Cyperaceae |
| Sailchearnach | Salix caprea | Goat Willow; Pussy Willow; Great Sallow | Salicaceae |
| Sailchuach Chon, Fanaigse, Bíodh-a-leithéid, Cogal Gorm, Plúirín | Viola riviniana | Common Dog-Violet | Violaceae |
| Sailchuach Chorraigh | Viola palustris | Marsh Violet | Violaceae |
| Sailchuach Luath | Viola reichenbachiana | Early Dog-Violet | Violaceae |
| Saileach Bhán | Salix alba | White Willow | Salicaceae |
| Saileach Bhriosc | Salix x fragilis | Crack Willow | Salicaceae |
| Saileach Liath | Salix cinerea fosp. cinerea | Grey Willow; Common Sallow; Grey sallow; Grey-leaved Sallow; Pussy Willow; Sally | Salicaceae |
| Saileach Reatha | Salix repens | Creeping Willow | Salicaceae |
| Saileach Rua | Salix cinerea fosp. oleifolia | Rusty Willow; Grey Willow; Common Sallow; Grey sallow; Grey-leaved Sallow; Pussy Willow; Rusty Sallow; Sally | Salicaceae |
| Saileachán Corraigh, Créachtach Criathraigh | Epilobium palustre | Marsh Willowherb | Onagraceae |
| Saileachán Leathan, Saileachán Sléibhe | Epilobium montanum | Broad-leaved Willowherb | Onagraceae |
| Saileachán Liath | Epilobium parviflorum | Hoary Willowherb | Onagraceae |
| Saileachán Sráide | Epilobium ciliatum | American Willowherb | Onagraceae |
| Saileánach | Salix viminalis | Osier | Salicaceae |
| Samhadh Bó, Bileoga Milse, Samhadh Coiteann, Samhadh | Rumex acetosa | Common Sorrel | Polygonaceae |
| Samhadh Caorach | Rumex acetosella | Sheep's Sorrel; Red Sorrel | Polygonaceae |
| Sceach Gheal, Draighean Bán, Draighean Geal | Crataegus monogyna | Hawthorn | Rosaceae |
| Sciollam na Móna, Lus Caisil | Narthecium ossifragum | Bog Asphodel | Nartheciaceae |
| Scornlus Aidria | Campanula portenschlagiana | Adria Bellflower | Campanulaceae |
| Scothóg Leathan | Bidens tripartita | Trifid Bur-marigold | Asteraceae |
| Seagalach Buan, Seagalach Ilbhliantúil | Lolium perenne | Perennial Rye-grass | Poaceae |
| Seamair Bhán | Trifolium repens | White Clover | Fabaceae |
| Seamair Bhuí, Seamróg | Trifolium dubium | Lesser Trefoil; Yellow Clover; Shamrock | Fabaceae |
| Seamair Dhearg, Seamair Chapaill | Trifolium pratense | Red Clover | Fabaceae |
| Seamair Dhuimhche | Trifolium campestre | Hop Trefoil | Fabaceae |
| Seamsóg, Seamair Choille | Oxalis acetosella | Wood Sorrel | Oxalidaceae |
| Searbh Dhearg | Pilosella aurantiaca | Fox-and-cubs | Asteraceae |
| Searbh na Muc, Seabhrán Muc, Caisearbhán na Muc, Cluas Luch, Cluas Liath, Srubhán, Sruth na Muc | Pilosella officinarum/Hieracium pilosella | Mouse-ear Hawkweed | Asteraceae |
| Searbh-bhiolar Casta | Cardamine flexuosa | Wavy bitter-cress | Brassicaceae |
| Searbh-bhiolar Giobach | Cardamine hirsuta | Hairy bitter-cress | Brassicaceae |
| Seiceamóir | Acer pseudoplatanus | Sycamore | Aceraceae |
| Seileastram, Alartram, Alastram, Curchas, Duileastram, Eileastar, Eileastram, Feileastar, Feileastram, Ga Gáinne, Seileastram, Seilistring, Siolastar, Siolastrach, Sléibhtrach, Soileastar, Soileastrach | Iris pseudacorus | Yellow Iris; Yellow Flag | Iridaceae |
| Seileastram Dearg, Feileastram Dearg | Crocosmia x crocosmiflora | Montbretia | Iridaceae |
| Sifín | Schoenus nigricans | Black Bog-rush | Cyperaceae |
| Slán Iomaire | Centranthus ruber | Red Valerian | Caprifoliaceae |
| Slánlus, Cál Phádraig, Ceann-táthair, Lus na Saighdiúirí, Lusra an tSeanchais, Slándus, Snárlus | Plantago lanceolata | Ribwort Plantain | Plantaginaceae |
| Slánlus Mara | Plantago maritima | Sea Plantain; Goose-tongue | Plantaginaceae |
| Slat Óir, Luibh an Fhall-saora, Luibh an Easa, Luibh Naomh Sheáin | Solidago virgaurea | Goldenrod | Asteraceae |
| Sponc, Adhann, Cluas Liath, Comann, Copóg Shleamhain, Fáthlán, Gallán Greanchair, Luibh-in-aghaidh-casachtaigh, Sponclus | Tussilago farfara | Coltsfoot; Colt's-foot | Asteraceae |
| Péine Monterey | Picea sitchensis | Sitka Spruce | Pinaceae |
| Stóinse Dearg | Bistorta amplexicaulis | Red Bistort | Polygonaceae |
| Sú Talún Bhréige, Lus Sútha Talún Bréige | Potentilla sterilis | Barren Strawberry | Rosaceae |
| Sú Talún Fhiáin, Lus Sútha Talún Fiáine, Oighreog, Sú Láir, Tlacht-shú | Fragaria vesca | Wild Strawberry | Rosaceae |
| Tailís | Arabidopsis thaliana | Thale Cress | Brassicaceae |
| Tím Chreige, Lus na mBrat, Lus Mhic Rí Breatan | Thymus drucei | Wild Thyme | Lamiaceae |
| Toircheas Fiáin | Ranunculus sceleratus | Celery-leaved Buttercup | Ranunculaceae |
| Toirpín Bréige | Phedimus spurius | Caucasian Stonecrop | Crassulaceae |
| Tomóg Ghaelach, Eascallóine | Escallonia rubra macracantha | Escallonia | Escalloniaceae |
| Tor an Fhéileacáin | Buddleja davidii | Butterfly Bush; Buddleja | Buddlejaceae |
| Tor Cúigmhéarach, Cúigmhéarach Tomach | Dasiphora fruticosa | Shrubby Cinquefoil | Rosaceae |
| Tornapa Fiáin, Duille Síneach | Brassica rapa | Wild Turnip/Chinese Leaf | Brassicaceae |
| Tráithnín Coinfhéar, Coinfhéar, Tráithnín | Cynosurus cristatus | Crested Dog’s-tail; Goldgrass; Crested Dogtailgrass | Poaceae |
| Treabhach | Barbarea vulgaris | Winter-cress | Brassicaceae |
| Trom | Sambucus nigra | Elder | Adoxaceae |
| Tromán | Sambucus ebulus | Dwarf Elder | Adoxaceae |
| Tuile Thalún, Tine Talún | Ranunculus bulbosus | Bulbous Buttercup | Ranunculaceae |
| Tursarraing Bheag, Tursarraingín | Stellaria graminea | Lesser Stitchwort | Caryophyllaceae |
| Tursarraing Mhór, Tuirseach | Stellaria holostea | Greater Stitchwort | Caryophyllaceae |
| Crann Silíní Fiáin | Prunus avium | Wild Cherry | Rosaceae |
| Donnroisc | Prunus padus | Bird Cherry | Rosaceae |
| Crann Silíní Searbha | Prunus cerasus | Sour Cherry | Rosaceae |