| County | FullName | Family | Status | Source |
|---|---|---|---|---|
| York | Adiantum pedatum L. | Pteridaceae | S3 | UNB |
| York | Agalinis paupercula (Gray) Britt. var. borealis Pennell | Scrophulariaceae | S1 | UNB |
| York | Agalinis tenuifolia (Vahl.) Raf. | Scrophulariaceae | S1SE | UNB |
| York | Agrimonia gryposepala Wallr. | Rosaceae | S2 | UNB |
| York | Alisma subcordatum Raf. | Alismataceae | S1 | UNB |
| York | Allium canadense L. | Liliaceae | S1 | UNB |
| York | Allium tricoccum Solander ex Ait. | Liliaceae | S2 | UNB |
| York | Amaranthus albus L. | Amaranthaceae | S3 | UNB |
| York | Amelanchier canadensis (L.) Medik. | Rosaceae | S3 | UNB |
| York | Amelanchier lucida Fern. | Rosaceae | S2 | UNB |
| York | Anemone americana (DC.) H. Hara | Ranunculaceae | S2 | UNB |
| York | Arabis drummondii Gray | Brassicaceae | S2 | UNB |
| York | Arabis glabra (L.) Bernh. | Brassicaceae | S2 | UNB |
| York | Arabis hirsuta (L.) Scop. var. pycnocarpa (Hopkins) Rollins | Brassicaceae | S2 | UNB |
| York | Arethusa bulbosa L. | Orchidaceae | S3 | UNB |
| York | Arnica lanceolata Nutt. | Asteraceae | S2S3 | UNB |
| YORK | Asplenium trichomanes L. | Aspleniaceae | S1S2 | UNB |
| York | Aster anticostensis Fern. | Asteraceae | S2 | UNB |
| York | Aster borealis (T. & G.) Prov. | Asteraceae | S2 | UNB |
| York | Aster laevis L. | Asteraceae | S1SE | UNB |
| York | Aster novi-belgii L. var. crenifolius (Fern.) Labrecque & Brouillet | Asteraceae | S2? | UNB |
| York | Aster tradescantii L. | Asteraceae | S3? | UNB |
| York | Astragalus alpinus L. var. brunetianus Fern. | Fabaceae | S3 | UNB |
| York | Astragalus eucosmus Robins. | Fabaceae | S2 | UNB |
| York | Betula pumila L. | Betulaceae | S3 | UNB |
| York | Boehmeria cylindrica (L.) Sw. | Urticaceae | S2 | UNB |
| York | Botrychium dissectum Spreng. | Ophioglossaceae | S3 | UNB |
| York | Botrychium lanceolatum (Gmel.) Angstr. ssp. angustisegmentum (Pease & Moore) Clausen | Ophioglossaceae | S3 | UNB |
| York | Botrychium simplex E. Hitch | Ophioglossaceae | S2 | UNB |
| York | Brasenia schreberi Gmel. | Cabombaceae | S3 | UNB |
| York | Bromus latiglumis (Shear) A.S. Hitchc. | Poaceae | S2 | UNB |
| York | Calopogon tuberosus (L.) BSP. | Orchidaceae | S3S4 | UNB |
| York | Calypso bulbosa (L.) Oakes | Orchidaceae | S2 | UNB |
| York | Cardamine concatenata (Michx.) Sw. | Brassicaceae | S2 | UNB |
| York | Cardamine x maxima (Nutt.) Wood | Brassicaceae | S2 | UNB |
| York | Carex arcta Boott | Cyperaceae | S3 | UNB |
| YORK | Carex backii Boott | Cyperaceae | S1 | UNB |
| YORK | Carex cephaloidea (Dewey) Dewey | Cyperaceae | S1 | UNB |
| York | Carex chordorrhiza Ehrh. ex L. f. | Cyperaceae | S2S3 | UNB |
| York | Carex conoidea Schkuhr ex Willd. | Cyperaceae | S2 | UNB |
| York | Carex cryptolepis Mack. | Cyperaceae | S3 | UNB |
| York | Carex diandra Schrank | Cyperaceae | S3 | UNB |
| York | Carex exilis Dewey | Cyperaceae | S2 | UNB |
| York | Carex garberi Fern. | Cyperaceae | S2 | UNB |
| York | Carex grisea Wahl. | Cyperaceae | S1 | UNB |
| York | Carex gynocrates Wormsk. ex Drejer | Cyperaceae | S2 | UNB |
| York | Carex haydenii Dewey | Cyperaceae | S2 | UNB |
| York | Carex hirtifolia Mack. | Cyperaceae | S1 | UNB |
| York | Carex lupulina Muhl. ex Willd. | Cyperaceae | S2 | UNB |
| York | Carex ormostachya Wieg. | Cyperaceae | S2S3 | UNB |
| York | Carex plantaginea Lam. | Cyperaceae | S2 | UNB |
| York | Carex prairea Dewey | Cyperaceae | S2 | UNB |
| York | Carex rosea Schkuhr ex Willd. | Cyperaceae | S3 | UNB |
| York | Carex sprengelii Dewey ex Spreng. | Cyperaceae | S2 | UNB |
| York | Carex sterilis Willd. | Cyperaceae | S1 | UNB |
| York | Carex tenera Dewey | Cyperaceae | S3 | UNB |
| York | Carex tuckermanii Dewey | Cyperaceae | S3 | UNB |
| York | Carex vaginata Tausch | Cyperaceae | S2S3 | UNB |
| York | Caulophyllum thalictroides (L.) Michx. | Berberidaceae | S3 | UNB |
| York | Ceratophyllum echinatum Gray | Ceratophyllaceae | S1S2 | UNB |
| York | Chamaesyce glyptosperma (Engelm.) Small | Euphorbiaceae | S1SE | UNB |
| York | Chenopodium simplex (Torr.) Raf. | Chenopodiaceae | S1 | UNB |
| York | Cladium mariscoides (Muhl.) Torr. | Cyperaceae | S2 | UNB |
| York | Clematis occidentalis (Hornem.) DC. | Ranunculaceae | S3 | UNB |
| York | Coeloglossum viride (L.) Hartman var. virescens (Muhl.) Luer. | Orchidaceae | S2 | UNB |
| York | Collomia linearis Nutt. | Polemoniaceae | S2SE | UNB |
| York | Corallorhiza maculata Raf. var. maculata | Orchidaceae | S2S3 | UNB |
| York | Corallorhiza maculata Raf. var. occidentalis (Lindley) Ames | Orchidaceae | S2S3 | UNB |
| York | Cornus amomum Mill. | Cornaceae | S2 | UNB |
| York | Crataegus jonesiae Sarg. | Rosaceae | S1 | UNB |
| York | Crataegus scabrida Sarg. | Rosaceae | S2 | UNB |
| York | Crataegus submollis Sarg. | Rosaceae | S2 | UNB |
| York | Cyperus dentatus Torr. | Cyperaceae | S3 | UNB |
| York | Cyperus diandrus Torr. | Cyperaceae | S1 | UNB |
| York | Cyperus esculentus L. | Cyperaceae | S3 | UNB |
| York | Cyperus squarrosus L. | Cyperaceae | S2 | UNB |
| York | Cypripedium parviflorum Salisb. var. makasin (Farwell) Sheviak | Orchidaceae | S2 | UNB |
| York | Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight | Orchidaceae | S3 | UNB |
| York | Cystopteris fragilis (L.) Bernh. | Dryopteridaceae | S3? | UNB |
| York | Cystopteris tenuis (Michx.) Desv. | Dryopteridaceae | S3S4 | UNB |
| York | Decodon verticillatus (L.) Ell. | Lythraceae | S1 | UNB |
| York | Diphasiastrum x sabinifolium (Willd.) Holub | Lycopodiaceae | S2S3 | UNB |
| York | Dirca palustris L. | Thymelaeaceae | S1S2 | UNB |
| York | Draba cana Rydb. | Brassicaceae | S1 | UNB |
| York | Drosera anglica Huds. | Droseraceae | S1 | UNB |
| York | Drosera linearis Goldie | Droseraceae | S1 | UNB |
| York | Dryopteris fragrans (L.) Schott | Dryopteridaceae | S3 | UNB |
| York | Dryopteris goldiana (Hooker ex Goldie) A. Gray | Dryopteridaceae | S2 | UNB |
| York | Elatine minima (Nutt.) Fisch. & Mey | Elatinaceae | S2 | UNB |
| York | Eleocharis quinqueflora (Hartm.) Schwarz. | Cyperaceae | S2S3 | UNB |
| York | Eleocharis robbinsii Oakes | Cyperaceae | S2 | UNB |
| York | Elodea nuttallii (Planch.) St. John | Hydrocharitaceae | S2 | UNB |
| York | Elymus canadensis L. | Poaceae | S2 | UNB |
| York | Epilobium coloratum Biehler | Onagraceae | S2? | UNB |
| York | Epilobium strictum Muhl. | Onagraceae | S2 | UNB |
| York | Equisetum palustre L. | Equisetaceae | S3 | UNB |
| York | Equisetum variegatum Schleich. ex Weber & Mohr | Equisetaceae | S3 | UNB |
| York | Eragrostis pectinacea (Michx.) Nees | Poaceae | S2? | UNB |
| York | Fallopia scandens (L.) Holub | Polygonaceae | S2S3 | UNB |
| York | Galium brevipes Fern. & Wieg. | Rubiaceae | S1 | UNB |
| York | Galium kamtschaticum Steller | Rubiaceae | S2 | UNB |
| York | Galium labradoricum Wieg. | Rubiaceae | S2 | UNB |
| York | Galium obtusum Bigel. | Rubiaceae | S2? | UNB |
| York | Goodyera repens (L.) R. Br. var. ophioides Fern. | Orchidaceae | S3 | UNB |
| York | Goodyera tesselata Lodd. | Orchidaceae | S3S4 | UNB |
| York | Gratiola neglecta Torr. | Scrophulariaceae | S3 | UNB |
| York | Hedeoma pulegioides (L.) Pers. | Lamiaceae | S2 | UNB |
| YORK | Helianthus decapetalus L. | Asteraceae | S1 | UNB |
| York | Heteranthera dubia (Jacq.) MacM. | Pontederiaceae | S1 | UNB |
| York | Hieracium paniculatum L. | Asteraceae | S1 | UNB |
| York | Humulus lupulus L. var. lupuloides E. Small | Cannabaceae | S1 | UNB |
| York | Hypericum majus (Gray) Britt. | Clusiaceae | S3 | UNB |
| York | Ionactis linariifolius (L.) Greene | Asteraceae | S2 | UNB |
| York | Isoetes acadiensis Kott | Isoetaceae | S1S2 | UNB |
| York | Isoetes prototypus D.M. Britton | Isoetaceae | S1 | UNB |
| York | Isoetes tuckermanii A. Braun ex Engelm. | Isoetaceae | S2S3 | UNB |
| YORK? | Juglans cinerea L. | Juglandaceae | S3 | UNB |
| York | Juncus militaris Bigel. | Juncaceae | S3 | UNB |
| York | Juncus torreyi Coville | Juncaceae | S1 | UNB |
| York | Lechea intermedia Leggett ex Britt. | Cistaceae | S3 | UNB |
| York | Leersia virginica Willd. | Poaceae | S2 | UNB |
| York | Lindernia dubia (L.) Pennell var. inundata Pennell | Scrophulariaceae | S3S4 | UNB |
| York | Liparis loeselii (L.) Richard | Orchidaceae | S3 | UNB |
| York | Listera auriculata Wieg. | Orchidaceae | S2S3 | UNB |
| YORK | Listera australis Lindl. | Orchidaceae | S1 | UNB |
| York | Listera convallarioides (Sw.) Nutt | Orchidaceae | S3S4 | UNB |
| York | Listera cordata (L.) R. Br. | Orchidaceae | S3S4 | UNB |
| York | Littorella uniflora (L.) Aschers. | Plantaginaceae | S2 | UNB |
| York | Lobelia cardinalis L. | Campanulaceae | S3 | UNB |
| York | Lobelia kalmii L. | Campanulaceae | S3S4 | UNB |
| York | Lonicera oblongifolia (Goldie) Hook. | Caprifoliaceae | S2 | UNB |
| York | Lysimachia thyrsiflora L. | Primulaceae | S3S4 | UNB |
| YORK | Malaxis monophylla (L.) Sw. var. brachypoda (Gray) Morris & Eames | Orchidaceae | S1 | UNB |
| York | Megalodonta beckii (Torr. ex. Spreng.) Greene | Asteraceae | S3 | UNB |
| York | Muhlenbergia frondosa (Poir.) Fern. | Poaceae | S3 | UNB |
| York | Muhlenbergia richardsonis (Trin.) Rydb. | Poaceae | S3 | UNB |
| York | Myriophyllum farwellii Morong | Haloragaceae | S2 | UNB |
| York | Myriophyllum humile (Raf.) Morong | Haloragaceae | S1 | UNB |
| York | Myriophyllum tenellum Bigel. | Haloragaceae | S3 | UNB |
| York | Myriophyllum verticillatum L. | Haloragaceae | S2 | UNB |
| York | Osmorhiza longistylis (Torr.) DC. | Apiaceae | S2? | UNB |
| York | Oxytropis campestris (L.) DC var. johannensis Fern. | Fabaceae | S2 | UNB |
| York | Panex trifolius L. | Araliaceae | S2 | UNB |
| York | Panicum linearifolium Scribn. ex Nash | Poaceae | S1S2 | UNB |
| York | Parnassia glauca Raf. | Saxifragaceae | S3 | UNB |
| York | Penthorum sedoides L. | Saxifragaceae | S2 | UNB |
| York | Persicaria amphibia (L.) S.F. Gray var. emersa (Michx.) Hickman | Polygonaceae | S2 | UNB |
| York | Persicaria arifolia (L.) Harolds. | Polygonaceae | S3 | UNB |
| York | Persicaria careyi (Olney) E.L. Greene | Polygonaceae | S2 | UNB |
| York | Persicaria hydropiperoides (Michx.) J.K. Small | Polygonaceae | S2 | UNB |
| York | Persicaria punctata (Ell.) Small | Polygonaceae | S2 | UNB |
| York | Phryma leptostachya L. | Verbenaceae | S2 | UNB |
| York | Pilea pumila (L.) Gray | Urticaceae | S2 | UNB |
| York | Plantago rugelii Dcne. | Plantaginaceae | S3 | UNB |
| York | Platanthera blephariglottis (Willd.) Lindl. | Orchidaceae | S3 | UNB |
| York | Platanthera grandiflora (Bigel.) Lindl. | Orchidaceae | S2 | UNB |
| York | Platanthera hookeri (Torr.) Lindl. | Orchidaceae | S3 | UNB |
| York | Platanthera huronensis (Nutt.) Lindl. | Orchidaceae | S2? | UNB |
| York | Platanthera orbiculata (Pursh) Lindl. | Orchidaceae | S3 | NBnat30(4) |
| York | Poa glauca Vahl. ssp. glauca | Poaceae | S2 | UNB |
| York | Podostemum ceratophyllum Michx. | Podostemaceae | S1 | UNB |
| York | Polygala sanguinea L. | Polygalaceae | S2 | UNB |
| York | Polygala senega L. | Polygalaceae | S2 | UNB |
| York | Polygonella articulata (L.) Meisn. | Polygonaceae | S2SE | UNB |
| York | Polygonum neglectum Besser | Polygonaceae | S1? | UNB |
| York | Polypodium appalachianum Haufler & Windham | Polypodiaceae | S3S4 | UNB |
| York | Polystichum braunii (Spenner) Fée | Dryopteridaceae | S3 | UNB |
| York | Potamogeton oakesianus Robbins | Potamogetonaceae | S2 | UNB |
| York | Potamogeton richardsonii (Benn.) Rydb. | Potamogetonaceae | S2 | UNB |
| York | Potentilla arguta Pursh | Rosaceae | S3 | UNB |
| York | Prenanthes racemosa Michx. | Asteraceae | S3 | UNB |
| York | Primula mistassinica Michx. | Primulaceae | S3 | UNB |
| York | Proserpinaca palustris L. | Haloragaceae | S2 | UNB |
| York | Pseudognaphalium macounii (Greene) Kartesz | Asteraceae | S2 | UNB |
| YORK | Pterospora andromedea Nutt. | Monotropaceae | S1 | UNB |
| York | Pyrola americana Sweet | Pyrolaceae | S3S4 | UNB |
| York | Ranunculus aquatilis L. var. diffusus Withering | Ranunculaceae | S1? | UNB |
| York | Ranunculus sceleratus L. | Ranunculaceae | S1 | UNB |
| YORK | Rhynchospora capillacea Torr. | Cyperaceae | S1 | UNB |
| York | Rhynchospora fusca (L.) Ait. f. | Cyperaceae | S2 | UNB |
| York | Rosa palustris Marsh. | Rosaceae | S2 | UNB |
| York | Rubus occidentalis L. | Rosaceae | S2 | UNB |
| York | Rumex salicifolius Weinm. var. mexicanus (Meisn.) C.L. Hitchc. | Polygonaceae | S2? | UNB |
| York | Salix myricoides Muhl. | Salicaceae | S3 | UNB |
| York | Salix nigra Marsh. | Salicaceae | S2 | UNB |
| York | Salix pedicellaris Pursh | Salicaceae | S3 | UNB |
| YORK | Saxifraga virginiensis Michx. | Saxifragaceae | S1 | UNB |
| York | Schizachyrium scoparium (Michx.) Nash | Poaceae | S2 | UNB |
| York | Scirpus pedicellatus Fern. | Cyperaceae | S2S3 | UNB |
| York | Scrophularia lanceolata Pursh | Scrophulariaceae | S2 | UNB |
| York | Selaginella rupestris (L.) Spring | Selaginellaceae | S1S2 | UNB |
| York | Solidago canadensis L. var. scabra Torr. & Gray | Asteraceae | S2 | UNB |
| York | Solidago simplex Kunth. ssp. randii (Porter) Ringius var. racemosa (Greene) Ringius | Asteraceae | S1 | UNB |
| York | Sparganium natans L. | Sparganiaceae | S2S3 | UNB |
| York | Spiranthes casei Catling & Cruise | Orchidaceae | S1 | UNB |
| York | Spiranthes cernua (L.) Richard | Orchidaceae | S2 | UNB |
| York | Spirodela polyrrhiza (L.) Schleid. | Lemnaceae | S2 | UNB |
| York | Sporobolus compositus (Poir.) Merr. | Poaceae | S1 | UNB |
| York | Stachys hispida Pursh. | Lamiaceae | S1S2 | UNB |
| York | Subularia aquatica L. | Brassicaceae | S1 | UNB |
| York | Tanacetum bipinnatum (L.) Schultz-Bip. ssp. huronense (Nutt.) Breitung | Asteraceae | S3 | UNB |
| York | Thalictrum confine Fern. | Ranunculaceae | S3 | UNB |
| York | Tilia americana L. | Tiliaceae | S3S4 | UNB |
| York | Tofieldia glutinosa (Michx.) Pers. | Liliaceae | S3 | UNB |
| York | Trichophorum clintonii (Gray) S.G. Smith | Cyperaceae | S3 | UNB |
| York | Triosteum aurantiacum Bickn. | Caprifoliaceae | S2 | UNB |
| York | Trisetum melicoides (Michx.) Scribn. | Poaceae | S3 | UNB |
| York | Utricularia geminiscapa Benj. | Lentibulariaceae | S2 | UNB |
| YORK | Utricularia gibba L. | Lentibulariaceae | S1 | UNB |
| York | Utricularia purpurea Walt. | Lentibulariaceae | S2S3 | UNB |
| York | Utricularia radiata Small | Lentibulariaceae | S1 | UNB |
| York | Vaccinium caespitosum Michx. | Ericaceae | S3 | UNB |
| York | Vaccinium corymbosum L. | Ericaceae | S1 | UNB |
| York | Valeriana uliginosa (T. & G.) Rydb. | Valerianaceae | S2 | UNB |
| York | Verbena urticifolia L. | Verbenaceae | S2 | UNB |
| York | Veronica peregrina L. ssp. xalapensis (Kunth) Pennell | Scrophulariaceae | S2? | UNB |
| York | Veronica serpyllifolia L. ssp. humifusa (Dickson) Syme | Scrophulariaceae | S2S3 | UNB |
| York | Viburnum dentatum L. var. lucidum Ait. | Caprifoliaceae | S2 | UNB |
| York | Viburnum lentago L. | Caprifoliaceae | S1 | UNB |
| York | Viola adunca Sm. | Violaceae | S3 | UNB |
| York | Viola labradorica Schrank | Violaceae | S2 | UNB |
| York | Viola nephrophylla Greene | Violaceae | S3 | UNB |
| York | Viola sagittata Ait. | Violaceae | S1 | UNB |
| York | Viola selkirkii Pursh | Violaceae | S3 | UNB |
| York | Waldsteinia fragarioides (Michx.) Tratt. | Rosaceae | S1 | UNB |
| York | Wolffia columbiana H. Karst. | Lemnaceae | S1? | UNB |
| YORK | Woodsia alpina (Bolton) S.F. Gray | Dryopteridaceae | S2 | UNB |
| York | Woodwardia virginica (L.) Sm. | Blechnaceae | S1 | UNB |
| York | Zizania palustris L. var. palustris | Poaceae | S3 | UNB |