All (in this database) Plants list (Scientific names): Part I
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- ianthinus (Burgess) ( Astermacrophyllus)
- Iatropha (Euphorbiaceae), see Jatropha
- iberica M. Bieb. (Scandix)
- iberica (Aristolochia)
- iberica (Bieb.) (Lallemantia)
- iberica (Salsola kali ssp. ), see Salsola tragus
- iberica Sennen & Pau (Salsola kali ssp. ), see Salsola tragus
- iberica Sennen & Pau, see Salsola tragus
- Iberis L. (Brassicaceae)
- Ibicella (Martyniaceae), see Proboscidea
- Icacinaceae Benth. (Magnoliopsida)
- icaco L. (Chrysobalanus)
- icmadophila (C. Müll.) (Didymodon)
- icmadophila C. Müll. (Barbula), see Didymodon icmadophila
- Icotorus Raf., 1830 (Rosaceae), see Neillia
- Icotorus Raf., 1830 (Rosaceae), see Physocarpus
- × idaeoides Ruthe (Rubus), see Rubus caesius × idaeus
- idaeus L. (Rubus)
- idaeus × saxatilis (Rubus)
- idahoense Math. & Const. (Lomatium)
- idahoense (Sisyrinchium), see Sisyrinchium angustifolium
- idahoense St. John & G.N. Jones (Erythronium), see Erythronium grandiflorum var. candidum
- idahoense St. John & G.N. Jones (grandiflorum var. ), see Erythronium grandiflorum var. candidum
- idahoensis (Sharp) ( Balsamorhizahookeri)
- idahoensis Henderson (Phacelia)
- idahoensis Munz ( Oenotherapallida)
- idahoensis (Piper) ( Saxifragaoccidentalis)
- idahoensis Atwood & Welsh (Penstemon)
- idahoensis (Keck) ( Penstemonmontanus)
- idahonis Wherry (Phlox)
- idriensis M.E. Jones ( Astragaluslentiginosus)
- ignarus Bailey (Rubus), see Rubus aboriginum
- ignatii Berg. (Strychnos)
- iguanae (Celtis)
- Ilex L. (Aquifoliaceae)
- Iliaceae (Magnoliopsida), see Aquifoliaceae
- Iliamna Greene (Malvaceae)
- ilicifolia Wangenh. (Quercus)
- ilicifolia (Nutt. ex Hook. & Arn.) (Prunus)
- ilicifolia × marilandica (Quercus), see Quercus × brittonii
- ilicifolia × phellos (Quercus), see Quercus × giffordii
- ilicifolia × rubra (Quercus), see Quercus × fernaldii
- ilicifolia × velutina (Quercus), see Quercus × rehderi
- iliense Huth. (Delphinium)
- Illecebraceae (Magnoliopsida), see Caryophyllaceae
- illecebrosus Focke (Rubus)
- Illecebrum L. (Caryophyllaceae)
- Illiciaceae (Magnoliopsida)
- Illicium (Illiciaceae)
- illinoensis Morong. (Potamogeton)
- illinoensis Gleason (Helianthus)
- illinoensis (Wang.) (Carya)
- ?illinoensis Prince (Fragaria virginiana var. ), see Fragaria virginiana var. grayana
- ?illinoensis Prince (Fragaria), see Fragaria virginiana var. grayana
- illinoensis (Fragaria virginiana var. ), see Fragaria virginiana var. grayana
- illinoensis Gray (Fragaria virginiana var. ), see Fragaria virginiana var. grayana
- Illipe Gras (Sapotaceae), see Madhuca
- illustris Bailey (Rubus), see Rubus canadensis
- illyricum L. (Onopordum)
- ilvense L., 1753 (Acrostichum), see Woodsia ilvensis
- ilvensis (L.) (Woodsia)
- ilvensis × scopulina Tryon, 1948 (Woodsia)
- imberbe Sm. (Hypecoum)
- imberbe Bunge (Dracocephalum)
- imberbis Gray ( Carextrichocarpa)
- imberbis R. & S. (Setaria)
- imbricans (D. C. Eat.) ( Polystichummunitum)
- imbricaria Michx. (Quercus)
- imbricaria × marilandica (Quercus), see Quercus × tridentata
- imbricaria × palustris (Quercus), see Quercus × exacta
- imbricaria × rubra (Quercus), see Quercus × runcinata
- imbricaria × shumardii (Quercus), see Quercus × egglestonii
- imbricaria × velutina (Quercus), see Quercus × leana
- imbricata (Hoya)
- imbricata Walt. (Iva)
- imbricata (Haw.) (Opuntia)
- imbricata Greene (Phacelia)
- imbricata Lang. ( Euphrasiaofficinalis)
- imbricata × whipplei, see Opuntia × viridiflora
- imbricatum Russow (Sphagnum)
- imbricatus L. (Gladiolus)
- imbricatus Torr. (Orthocarpus)
- imbricatus Haw. (Cereus), see Opuntia imbricata var. imbricata
- imitans H. Lindb. ex Såltin (Taraxacum)
- immanis Ashe (Rubus)
- impar Nelson (Arabis lignipes var. ), see Arabis puberula
- impar Nelson (Arabis subpinnatifida var. ), see Arabis puberula
- Impatiens L. (Balsaminaceae)
- impatiens L. (Cardamine)
- Impatientella (Balsaminaceae), see Impatiens
- impedata Small (Opuntia), see Opuntia humifusa var. ammophila
- impensis Rydb., see Astragalus kentrophyta var. elatus
- imperfectus (Rydb.) ( Astragalusnuttallianus)
- imperialis L. (Fritillaria)
- imperiorum (Rubus), see Rubus roribaccus
- imperiorum Fern. (Rubus), see Rubus roribaccus
- implexus (Astragalus kentrophyta ssp. ), see Astragalus kentrophyta var. tegetarius
- implexus Canby ex Porter & Coult. (kentrophyta ssp. ), see Astragalus kentrophyta var. tegetarius
- implexus Canby ex Porter & Coult. (kentrophyta var. ), see Astragalus kentrophyta var. tegetarius
- implexus Greene (caespitosus var. ), see Mimulus tilingii var. caespitosus
- implicatum Scribn. (Panicum)
- implicatus Greene (Mimulus), see Mimulus tilingii var. tilingii
- impolita auct. p.p. (Potentilla), see Potentilla argentea var. acutifida
- impolita auct. p.p. (Potentilla), see Potentilla argentea var. decora
- impolita auct. p.p. (Potentilla), see Potentilla argentea var. dissecta
- impolita auct. p.p. (Potentilla), see Potentilla argentea var. incanescens
- imponens Hedw. (Hypnum)
- impos Bailey (Rubus), see Rubus alumnus
- improvisum Norrl. (Hieracium)
- impunctatum Norrl. (Hieracium)
- imus Bailey (Rubus canadensis var. ), see Rubus canadensis
- × inaequalis Palmer & Steyermark (Quercus), see Quercus × filialis
- inamoenus Greene (Ranunculus)
- inamoenus Greene (Mimulus), see Mimulus glabratus var. jamesii
- inarmatus Blanch. (Rubus recurvicaulis var. ), see Rubus recurvicaulis
- incana (Nutt.) (Balsamorhiza)
- incana (L.) (Alnus)
- incana (L.) (Berteroa)
- incana L. (Draba)
- incana (L.) (Hirschfeldia)
- incana (L.) (Matthiola)
- incana Bartram (Quercus)
- incana Brand (Phacelia)
- incana Aubl. (Licania)
- incana Bunge (Lagopsis), see Lagopsis marrubiastrum
- incana Gray (Solidago nemoralis var. ), see Solidago mollis
- incana Muhl.? (Scutellaria), see Scutellaria canescens
- incana Nutt. (Balamorhiza), see Balsamorhiza incana
- incana × laevis (Quercus), see Quercus × ashei
- incana × laurifolia (Quercus), see Quercus × atlantica
- incana × marilandica (Quercus), see Quercus × cravenensis
- incana × myrtifolia (Quercus), see Quercus × oviedoensis
- incana × nigra (Quercus), see Quercus × caduca
- incana × velutina (Quercus), see Quercus × podophylla
- incanescens (Opiz) ( Potentillaargentea)
- ?incanopilosus Sheldon (Aster), see Aster falcatus
- incanum Wats. ( Chenopodiumfremontii)
- incanum DC. (Apocynum androsaemifolium var. ), see Apocynum androsaemifolium var. androsaemifolium
- incanum Greene (Apocynum), see Apocynum androsaemifolium var. androsaemifolium
- incanum S. G. Gmel. (Cirsium arvense var. ), see Cirsium arvense var. vestitum
- incanus (Shear) (Bromus)
- incanus Wendland (Hibiscus)
- incarnata (L.) (Dactylorhiza)
- incarnata L. (Asclepias)
- incarnata L. (Allionia)
- incarnata L. (Passiflora)
- incarnata L. (Polygala)
- incarnata (Fish.) ( Pyrolaasarifolia)
- incarnata (Vent.) (Linaria)
- incarnata L. (Dactylorhis), see Dactylorhiza incarnata
- incarnata L. (Orchis), see Dactylorhiza incarnata
- incarnata × maculata (Dactylorhiza)
- incarnata × maculorsa (Dactylorhiza), see Dactylorhiza incarnata × maculata
- incarnata × traunsteineri (Dactylorhiza)
- incarnatum Walt. (Eupatorium)
- incarnatum L. (Trifolium)
- incarnatus (Orchis incarnatus ssp. ), see Dactylorhiza incarnata ssp. incarnata
- incarnatus (Orchis), see Dactylorhiza incarnata
- incerta Pays. (Draba)
- incertus M.A. Curtis (Cenchrus)
- incisa (Schrad.) (Lophozia)
- incisa Asch. ( Angelicasylvestris)
- incisa (Thunb.) (Stephanandra)
- incisa Froel. ( Veronicachamaedrys)
- incisa (Nutt.) (Cissus)
- incisa Lindb. (Lophocolea), see Lophocolea heterophylla
- incisa Thunb. (Spiraea), see Stephanandra incisa
- incisifrons Bailey (Rubus), see Rubus argutus
- inciso-serratum (Polystichum munitum var. ), see Polystichum munitum var. munitum
- inciso-serratum D. C. Eaton (Aspidium munitum var. ), see Polystichum munitum var. munitum
- incisum (Howe) ( Aspleniumplatyneuron)
- incisum (Geranium), see Geranium oreganum
- incisum (Lamium purpureum var. ), see Lamium hybridum
- incisum Gray (Aspidium acrostichoides var. ), see Polystichum acrostichoides var. schweinitzii
- incisum Gray (acrostichoides v. ), see Polystichum acrostichoides var. schweinitzii
- incisum Willd. (Lamium purpureum var. ), see Lamium hybridum
- incisus Porter ( Asterlowrieanus)
- ?incl. aspidiaceae (Pteropsida), see Dryopteridaceae
- ?incl. athyriaceae (Pteropsida), see Dryopteridaceae
- ?incl. pulsatilla Miller (Ranunculaceae), see Anemone
- Incl. woodsiaceae (Pteropsida), see Dryopteridaceae
- inclinata (Hedw. f.) (Tortella)
- inclinata Vill. (Potentilla)
- inclinatum (Hedw.) (Distichium)
- inclinatum Brid., see Bryum stenotrichum
- inclinatum Lindb. (Mnium), see Mnium ambiguum
- inclinatum Lindb. (orthorrhynchum var. ), see Mnium ambiguum
- inclinis Bailey (Rubus)
- includens Dahlst. (Hieracium)
- incognita Brainerd. (Viola)
- × incomita Palmer (Quercus)
- × incomparabilis Miller (Narcissus)
- incompta (Nutt.) ( Artemisialudoviciana)
- inconspicua Greene (Phacelia)
- inconspicua (Nemophila), see Nemophila parviflora var. austiniae
- inconspicuum (Wats.) (Erysimum)
- inconspicuus L. (Lathyrus)
- inconspicuus Gray (Mimulus)
- × inconstans Palmer (Quercus)
- incrassata (Hoya)
- incrassata (Norrl.) (Pilosella)
- incrassata Norrl. (Hieracium), see Pilosella incrassata
- incrassatiforme (Norrl.) (Pilosella)
- incrassatiforme Norrl. (Hieracium), see Pilosella incrassatiforme
- ?incrassatum Norrl. (Hieracium), see Pilosella incrassata
- incrassatum (Hieracium), see Pilosella incrassata
- incurrens Saelan ex Norrl. (Hieracium)
- incurva Schwaegr. (Grimmia)
- incurva Lindb. (Fossombronia)
- incurva Lightf. (Carex)
- incurvata (Hedw.) (Lescuraea)
- incurvata Lindb. (Riccardia)
- incurvata Hedw. (Pseudoleskea), see Lescuraea incurvata
- incurvatum (Brid.) (Homomallium)
- incurvula (Hoya)
- incurvum Brid., see Oligotrichum hercynicum
- incurvus Rydb., see Astragalus purshii var. purshii
- indecora Chois. (Cuscuta)
- indecora J.T. Howell (Phacelia)
- independens (Rubus), see Rubus alumnus
- independens Bailey (Rubus), see Rubus alumnus
- indianensis (Rubus), see Rubus depavitus
- indianensis Bailey (Rubus), see Rubus depavitus
- indica L. (Canna)
- indica L. (Flagellaria)
- indica Gaertn. (Eleusine)
- indica L. (Xyris)
- indica L. (Mangifera)
- indica (Aristolochia)
- indica L. (Tamarindus)
- indica (Capparis)
- indica L. (Vateria)
- indica (Aeschynomene)
- indica Juss. (Azadirachta)
- indica (Colebr.) (Docynia)
- indica (Andr.) (Duchesnea)
- indica (L.) (Rhaphiolepis)
- indica Gmelin (Madhuca)
- indica (Melilotus), see Melilotus indicus
- indica (Plantago), see Plantago psyllium
- indica Andr. (Fragaria), see Duchesnea indica
- indica Andr. (Potentilla), see Duchesnea indica
- indica Colebr. (Pyrus), see Docynia indica
- indica L. (Crataegus), see Rhaphiolepis indica
- indica L. (Plantago), see Plantago arenaria
- indica Spch. (Cydonia), see Docynia indica
- indica Wall. (Pirus), see Docynia indica
- indicum (DC.) (Dendranthema)
- indicum L. (Heliotropium)
- indicum L. (Canarium)
- indicum L. (Sesamum)
- indicus (L.) (Melilotus)
- indicus (Aesculus)
- indicus R. Br. (Hemidesmus)
- Indigofera (Fabaceae)
- ?indivisa DC. (amphibium f. ), see Rorippa amphibia
- indusiata Brid. (Buxbaumia), see Buxbaumia viridis
- inebrians (Lindl.) ( Ribescereum)
- ineptus (Gray) ( Astragaluslentiginosus)
- inerme Rydb. (Ribes)
- inerme Rehd. (cynosbati var. ), see Ribes cynosbati
- inermis Leysser (Bromus)
- inermis (Nutt.) (Spermolepis)
- inermis (Mönch) ( Spinaciaoleracea)
- inermis (Pallas) ( Ononisarvensis)
- inermis (Willd.) ( Rubusulmifolius)
- inermis Leysser (Bromopsis), see Bromus inermis
- inermis Leysser (Zerma), see Bromus inermis
- inermis Palmer & Steyerm (Rosa setigera f. ), see Rosa setigera
- inermis Rydb., see Ribes inerme var. inerme
- inexpansa (Michx.) (Rhynchospora)
- inexpansa Gray (Calamagrostis)
- × inexpectatum Braun, see Asplenium ruta-muraria × Camptosorus
- × inexpectatus Braun, 1940 (Asplenosorus), see Asplenium ruta-muraria × Camptosorus
- inferalpina (Wahlenb.) ( Carexnorvegica)
- ?inferalpina (Carex rigida var. ), see Carex bigelowii
- ?inferalpina Laest. (Carex rigida var. ), see Carex bigelowii
- ?infestum Waldst. & Kit. (Galium), see Galium spurium ssp. vaillantii
- infirmus Michx. (Aster)
- infirmus Michx. (Doellingeria), see Aster infirmus
- inflata (Huds.) (Gymnocolea)
- inflata L. (Lobelia)
- inflata Walt. (Utricularia)
- inflata Sm. (Silene), see Silene vulgaris
- inflata Sweet (Calystegia), see Calystegia sepium ssp. americana
- inflata auct. (Carex), see Carex rostrata
- inflatulus Suksdorf (Mimulus), see Mimulus breviflorus
- inflatum (Suksd.) (Sisyrinchium)
- inflexa Engelm. (Cuscuta), see Cuscuta coryli
- inflexum Mackenzie & Bush. (Xanthium)
- inflexus (L.) (Juncus)
- inflexus Dougl. ex Hook. (Astragalus)
- inflexus L. (Juncux), see Juncus inflexus
- infundibuliformis Torr. (Phacelia)
- ingens Palmgr. (Taraxacum)
- iniens Bailey (Rubus)
- injunctus (Rubus), see Rubus roribaccus
- injunctus Bailey (Rubus), see Rubus roribaccus
- innata (Coralliorrhiza), see Corallorhiza trifida
- innata R. Br. (Corallorhiza), see Corallorhiza trifida
- inobvius Bailey (Rubus), see Rubus michiganensis
- inodora (Matricaria), see Tripleurospermum perforatum
- inodora L. (Matricaria), see Tripleurospermum perforatum
- inodorum (Aiton) (Nothoscordum)
- inodorum (Tripleurospermum), see Tripleurospermum perforatum
- inodorum L. (Tripleurospermum maritimum var. ), see Tripleurospermum perforatum
- inodorum Schultz Bip. (Tripleurospermum), see Tripleurospermum perforatum
- inodorum × maritimum (Tripleurospermum)
- inodorus L. (Philadelphus)
- inodorus Greene (Mimulus), see Mimulus moschatus var. moniliformis
- inophyllum L. (Calophyllum)
- inopina Ashe (Quercus)
- inops Ait. (Pinus), see Pinus virginiana
- inornata Greene (Grindelia)
- insecta Lindb. (Nardia)
- insectifera L. (Ophrys)
- inseptus Barneby ( Astragalusatratus)
- inserta (A. Kerner) (Parthenocissus)
- insignis Duch. (Carludovica)
- insignis Benth. (Nemophila)
- insignis Bartl. (Oenothera)
- ?insignis Fries (Juncus alpinus var. ), see Juncus alpinoarticulatus
- ?insignis Fries. (Juncus alpinus var. ), see Juncus alpinoarticulatus
- insignis Greene (Mimulus guttatus var. ), see Mimulus guttatus
- insignis Greene (langsdorfii var. ), see Mimulus guttatus
- insititia (L.) ( Prunusdomestica)
- insolens (Sarg.) ( Crataeguslucorum)
- insons Bailey (Rubus)
- insperata Jepson (Quercus lobata var. ), see Quercus lobata
- insubrica Kunz (Gentiana)
- insulanus Bailey (Rubus)
- insularis Kellogg (Astragalus)
- insularis Munz (Phacelia)
- insularis Calder & Taylor (pennellii var. ), see Pedicularis parviflora ssp. parviflora
- insularum Bomanss. (inclinatum var. ), see Bryum salinum
- intectum Nels. ( Eriogonumumbellatum)
- integerrima (Lindb.) (Cephaloziella)
- integerrima (L.) (Taenidia)
- integerrima (Rydb.) ( Grindelianana)
- integerrima (Celak.) ( Camelinaalyssum)
- ?integerrima (Medicus) ( Cotoneastervulgaris)
- integerrimum Spring, 1842 ( Lycopodiumclavatum)
- integerrimum Lindb. (Dichiton), see Cephaloziella integerrima
- integerrimus Nutt. (Senecio)
- integerrimus Medik. (Cotoneaster)
- integerrimus Medicus (Cotoneaster), see Cotoneaster vulgaris ssp. integerrima
- integra (Nutt.) (Habenaria)
- integra (Castilleja)
- integra (Habernaria), see Habenaria integra
- integra (Pyrola dentata var. ), see Pyrola dentata
- integra Nutt. (Gymnadeniopsis), see Habenaria integra
- integra Nutt. (Habernaria), see Habenaria integra
- integrata Gren. & Godr. ( Lactucascariola)
- integrifolia (Muhl.) ( Ambrosiatrifida)
- integrifolia Michx. (Bellis)
- integrifolia DC. (Grindelia)
- integrifolia Nutt. ( Grindelianana)
- integrifolia (Boiss.) ( Brassicaelongata)
- integrifolia DC. ( Capsellabursa-pastoris)
- integrifolia (Nutt.) (Cardamine)
- integrifolia L. (Andryala)
- integrifolia Bigel (Lactuca)
- integrifolia (Gray) ( Lactucaspicata)
- integrifolia Gray ( Knautiaarvensis)
- integrifolia Torr. (Phacelia)
- integrifolia L. (Scutellaria)
- integrifolia Hook. (Saxifraga)
- integrifolia (Willd.) (Lagotis)
- integrifolium Wimm & Grab. ( Cirsiumarvense)
- integrifolium (Hook.) ( Eriophyllumlanatum)
- integrifolium (Nutt.) (Thelypodium)
- ?integrifolium Lindb. (scoparium var. ), see Dicranum scoparium
- integrifolium (Pleurophragma), see Thelypodium integrifolium
- integrifolium H. Lindb. (bonjeanii var. ), see Dicranum leioneuron
- integrifolium Lindb. (Mnium affine var. ), see Plagiomnium ellipticum
- integrifolius Nutt. (Aster)
- integrifolius (L.) (Senecio)
- integristipula Steph. (Calypogeia)
- integriuscula Gray ( Ipomoeahederacea)
- intercedens H. Lindb. (Eriophorum), see Eriophorum russeolum ssp. rufescens
- intercedens Hara (Anaphalis margaritacea var. ), see Anaphalis margaritacea
- interioides Hultén ( Pedicularissudetica)
- interior Wiegand (Juncus)
- interior Rydb. (Potamogeton)
- interior Fern. ( Phaceliadubia)
- interior (Hultén) ( Pedicularissudetica)
- interior Bailey (Carex), see Carex scirpoides
- interior M.E. Jones (Astragalus purshii var. ), see Astragalus purshii var. purshii
- interioris Bailey (Rubus), see Rubus laudatus
- interius Fern. (Maianthemum canadense var. ), see Maianthemum canadense
- interjecta Bailey ( Carexdebilis)
- intermedia Schimp. (Ulota)
- intermedia (Turn.) (Pottia)
- intermedia (Muhl.) (Eleocharis)
- intermedia (Wolfg.) ( Najasmarina)
- × intermedia Ames. (Spiranthes)
- intermedia Vasey (Danthonia)
- intermedia (Ceropegia)
- intermedia Cronq. ( Balsamorhizacareyana)
- intermedia Fisch. & Mey. (Amsinckia)
- intermedia (Berzelia)
- intermedia Wats. (Suaeda)
- intermedia Hayne (Drosera)
- × intermedia (Hook.) (Phyllodoce)
- intermedia (L.) (Corydalis)
- intermedia Koch ( Myriophyllumverticillatum)
- intermedia (Vill.) ( Galeopsisladanum)
- intermedia Hayne (Utricularia)
- intermedia Ehrh. (Circaea)
- intermedia (DC.) ( Plantagomajor)
- intermedia (T. Marsson) ( Armeriamaritima)
- intermedia (Rydb.) ( Potentillaglandulosa)
- intermedia L. (Potentilla)
- intermedia (Ehrh.) (Sorbus)
- intermedia Piper ( Boykiniamajor)
- intermedia Rydb. ( Physalisvirginiana)
- intermedia (Willdenow) (Dryopteris)
- × intermedia Ledeb. (Nuphar), see Nuphar lutea × pumila
- × intermedia Thomas ex Gaudin (Betula), see Betula nana × pubescens
- ?intermedia (Myosotis), see Myosotis arvensis
- ?intermedia (Ruppia maritima f. ), see Ruppia maritima
- ?intermedia Rydb. (Meriolix), see Oenothera serrulata
- ?intermedia Schur. (Carlina vulgaris var. ), see Carlina vulgaris
- ?intermedia Thed. (maritima f. ), see Ruppia maritima
- intermedia DC. (Tilia), see Tilia × europaea
- intermedia Fenzl (Sagina), see Sagina nivalis
- intermedia Gooden. (Carex), see Carex disticha
- intermedia Hoffm. (Callitriche), see Callitriche hamulata
- intermedia Link. (Myosotis), see Myosotis arvensis
- intermedia Rydb. (Kallstroemia), see Kallstroemia parviflora
- intermedia Scribn. (Agrostis), see Agrostis perennans
- intermedia Woot. p.p. (Phacelia), see Phacelia caerulea
- intermedia Woot. p.p. (Phacelia), see Phacelia crenulata var. crenulata
- intermedia auct. (Amsinckia), see Amsinckia micrantha
- intermedia × marginalis Benedict, 1909 (Dryopteris)
- "intermedia × minor" (Utricularia), see Utricularia ochroleuca
- intermedia × minor (Utricularia), see Utricularia ochroleuca
- intermedia × spinulosa Wherry, 1960 (Dryopteris)
- intermedium (Brid.) (Bryum)
- intermedium Limpr. ( Gymnomitrionconcinnatum)
- intermedium Bicknell (Sisyrinchium)
- intermedium (Aconitum)
- intermedium (Eaton) ( Botrychiummultifidum)
- × intermedium Ehrh. (Geum), see Geum rivale × urbanum
- × intermedium Ruthe (Vaccinium), see Vaccinium myrtillus × vitis-idaea
- × intermedium Sarvela (Gymnocarpium), see Gymnocarpium continentale × dryopteris
- intermedium Eaton (Equisetum hyemale v. ), see Equisetum × ferrisii
- intermedium Fr. (Lamium), see Lamium confertum
- intermedium Muhlenberg, 1810 (Polypodium), see Dryopteris intermedia
- intermedium Schult. (Galium), see Galium schultesii
- intermedium Willdenow, 1810 (Aspidium), see Dryopteris intermedia
- intermedius (Lindb.) (Drepanocladus)
- intermedius Gray ( Asteroccidentalis)
- intermedius (Rydb.) ( Physocarpusopulifolius)
- ?intermedius (Ranunculus), see Ranunculus flammula
- intermedius Rydb. (Opulaster), see Physocarpus opulifolius var. intermedius
- intermontanus (Heller) ( Lupinuspusillus)
- internatum Brenner (Hieracium)
- interrupta H. Lindb. (Mentha litoralis f. ), see Mentha × verticillata
- interruptum (Norrl.) (Pilosella)
- interruptum Norrl. (Hieracium), see Pilosella interruptum
- interruptus Kitaibel (Potamogeton)
- interstincta (Vahl.) (Eleocharis)
- intertexta (Bentham) (Navarretia)
- intertextus (Greene) ( Ranunculusnatans)
- intonsa Fernald. ( Salixlucida)
- intonsa Sheldon, see Astragalus villosus
- intonsus Butt. & St. John ( Lathyrusvenosus)
- intricata (Lindb.) ( Marsupellaboeckii)
- intricata Trel. (Quercus)
- intricata auct. (Crategus), see Crataegus grayana
- intricatum (Hartm.) (Orthothecium)
- intrigata J. Lange (Crataegus), see Crataegus coccinea
- intrigata Sarg. not J. Lange (Crataegus), see Crataegus apposita
- × introgressa P.M. Thompson (Quercus)
- intumescens Rudge (Carex)
- intybus L. (Cichorium)
- Inula L. (Asteraceae)
- inuloides (Fischer ex Janka) (Phalacrachena)
- inundata (Oakes) ( Rhynchosporamacrostachya)
- inundata J.T. Howell (Phacelia)
- inundata (L.) (Lycopodiella)
- inundata (Lycopodium), see Lycopodiella inundata
- inundata L. (Lepidoptis), see Lycopodiella inundata
- inundatum (Russow) ( Sphagnumauriculatum)
- inundatum (Lycopodium), see Lycopodiella inundata
- inundatum L., 1753 (Lycopodium), see Lycopodiella inundata
- × inundatus Drejer (Juncus), see Juncus balticus × filiformis
- invenusta (Greene) (Wyethia)
- inversus M.E. Jones (Astragalus)
- inverta (Nels. & Macbr.) (Castilleja)
- invisa (W. Boott) ( Carexhormathodes)
- invisus (Bailey) (Rubus)
- involucrata (Nutt.) (Bidens)
- involucrata (Richardson) (Lonicera)
- involucrata Rottb. (Gentiana)
- involucrata (T. & G.) (Callirhoe)
- involucrata Baill. (Davidia)
- involucrata Nutt. (Coreopsis), see Bidens involucrata
- involucratum Dahlst. (Taraxacum)
- × involuta Bab. (Carex), see Carex rostrata × vesicaria
- inyoensis Sheldon (Astragalus)
- inyoensis (J.F. Macbr.) (Phacelia)
- inyoensis J.F. Macbr. (Miltitzia), see Phacelia inyoensis
- iodandra Robinson (Bartonia)
- iodanthus S. Wats. (Astragalus)
- iodanthus (Astragalsu iodanthus var. ), see Astragalus iodanthus var. iodanthus
- iodopetalus (Rydb.) (Astragalus)
- ioensis (Wood) (Malus)
- ioensis (Pyrus), see Malus ioensis
- ioensis Wood (Pyrus coronaria var. ), see Malus ioensis
- ioensis Wood (Pyrus), see Malus ioensis
- ioensis × malus (Pyrus), see Malus × soulardi
- iowense (Pammel) (Cirsium)
- ?iowense Rydb. (Chrysosplenium), see Chrysosplenium tetrandrum
- iowense Rydb. (Chrysosplenium), see Chrysosplenium tetrandrum
- ipecacuanha (Brot.) (Cephaelis)
- ipecacuanha Baill. (Hybanthus)
- ipecacuanhae L (Euphorbia)
- Ipecacuanhae (Euphorbia), see Euphorbia ipecacuanhae
- Ipomoea L. (Convolvulaceae)
- Iridaceae Juss. (Liliopsida)
- irio L. (Sisymbrium)
- Iris L. (Iridaceae)
- irrasa Sarg. (Crataegus)
- irregularis Bailey (Rubus), see Rubus canadensis
- irrigata Lindb. (Poa), see Poa humilis
- irrigatum Zett. (commutatum var. ), see Cratoneuron commutatum var. fluctuans
- irrigatum Zett. (glaucum var. ), see Cratoneuron commutatum var. fluctuans
- irrigua (Nees) (Scapania)
- irrigua (Wahlenb.) ( Carexmagellanica)
- irrigua Dougl., see Ribes irriguum
- irriguum Dougl. (Ribes)
- irriguum Hook. & Wils. (Hygroamblystegium), see Hygroamblystegium tenax
- Irvingia (Irvingiaceae)
- Irvingiaceae (Magnoliopsida)
- Isachne (Poaceae)
- Isatis L. (Brassicaceae)
- ischaemum (Schreber) (Digitaria)
- iselyi Welsh (Astragalus)
- islandica ( Gentianellacampestris)
- islandica L. (Koenigia)
- islandica Nees, see Pleuroclada albescens
- islandica auct. (Rorippa), see Rorippa palustris
- Isoetaceae (Lycopsida)
- Isoetes L. (Isoetaceae)
- isoetiformis J. G. Sm. (Sagittaria), see Sagittaria teres
- isogyna Fr. ( Carexdioica)
- Isolepis R. Br. (Cyperaceae)
- Isopterygium Mitt. (Plagiotheciaceae)
- Isopyrum (Ranunculaceae)
- Isothecium Brid. (Lembophyllaceae)
- Isotrema Raf. (Aristolochiaceae), see Aristolochia
- ispahanensis ( Prunuspersica)
- isthmensis (Capparis)
- isthmia Killip ( Passiflorafoetida)
- isthmicola H. Lindb. (Taraxacum)
- italica (L.) (Setaria)
- italica Retz. (Anchusa)
- italica (Moench) ( Populusnigra)
- italicum (Helichrysum)
- italicum (Moretti) ( Xanthiumstrumarium)
- italicum L. (Echium)
- italicum A. Br. (Lolium), see Lolium multiflorum
- italicus Miller (Gladiolus)
- Iteaceae (Magnoliopsida), see Escalloniaceae
- Iteaceae J. Agardh., 1858 (Magnoliopsida), see Escalloniaceae
- ithacanus Bailey (Rubus)
- ithyphylla Brid. (Bartramia)
- Iva L. (Asteraceae)
- Ivesia Torr. & Gray, 1857 (Rosaceae)
- ivesiana Torr. (Phacelia)
- ivesii Britton (Acerates viridiflora var. ), see Acerates viridiflora var. lanceolata
- ixocarpa Brotero (Physalis)
- ixoderme Quick ( Ribesmenziesii)
- ixodes Kellogg (Phacelia)
- Ixonanthaceae (Magnoliopsida)
- Ixonanthes (Ixonanthaceae)
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