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Families: 122
Genera: 469
Species: 1039 (species rank)
Total Taxa: 1098 (including subsp. and var.)

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Monotropa uniflora L. - Indian-pipe
Pyrola elliptica Nutt. - wax-flower shin-leaf
Vaccinium angustifolium Aiton - low sweet blueberry
Vaccinium oxycoccos L. - small cranberry
Euphorbia corollata L. - flowering spurge
Euphorbia cyparissias L. - graveyard spurge
Euphorbia dentata Michx. - toothed spurge
Euphorbia glyptosperma Engelm. - ridge-seeded spurge
Euphorbia marginata Pursh - snow-on-the-mountain
Euphorbia nutans Lag. - nodding spurge
Baptisia lactea (Raf.) Thieret - white wild indigo
Caragana arborescens Lam. - Siberian pea-shrub
Dalea candida var. candida - white prairie-clover
Dalea purpurea var. purpurea - violet prairie-clover
Desmodium canadense (L.) DC. - showy tick-trefoil
Desmodium illinoense A.Gray - prairie tick-trefoil
Lathyrus palustris L. - slender-stem pea-vine
Lespedeza capitata Michx. - round-headed lespedeza
Lotus corniculatus L. - bird's-foot trefoil
Medicago lupulina L. - black medick
Melilotus albus Medik. - white sweet-clover
Melilotus officinalis (L.) Lam. - yellow sweet-clover
Securigera varia (L.) Lassen - purple crown-vetch
Trifolium hybridum L. - alsike clover
Trifolium incarnatum L. - crimson clover
Trifolium repens L. - white clover
Vicia villosa Roth - winter vetch
Quercus alba L. - white oak
Quercus rubra L. - northern red oak
Gentiana andrewsii var. andrewsii - prairie closed gentian
Gentianopsis crinita (Froel.) Ma - greater fringed gentian
Gentianopsis virgata (Raf.) Holub - small fringed gentian
Geranium maculatum L. - wild geranium
Ribes americanum Mill. - wild black currant
Ribes cynosbati L. - prickly wild gooseberry
Ribes hirtellum Michx. - swamp gooseberry
Ribes missouriense Nutt. - wild gooseberry
Ribes rubrum L. - garden red currant
Myriophyllum heterophyllum Michx. - various-leaved water-milfoil
Myriophyllum sibiricum Kom. - short-spike water-milfoil
Myriophyllum spicatum L. - spike water-milfoil
Myriophyllum verticillatum L. - whorled water-milfoil
Hamamelis virginiana L. - American witch-hazel
Elodea canadensis Michx. - common waterweed
Najas marina L. - spiny naiad
Najas minor All. - eutrophic water-nymph
Hypericum kalmianum L. - Kalm's St. John's-wort
Hypericum majus (A.Gray) Britton - larger Canadian St. John's-wort
Hypericum perforatum L. - St. John's-wort
Hypericum punctatum Lam. - spotted St. John's-wort
Triadenum fraseri (Spach) Gleason - Fraser's marsh St. John's-wort
Hypoxis hirsuta (L.) Coville - yellow star-grass
Iris pseudacorus L. - yellow water iris
Sisyrinchium albidum Raf. - white blue-eyed-grass
Sisyrinchium angustifolium Mill. - stout blue-eyed-grass
Sisyrinchium campestre E.P.Bicknell - prairie blue-eyed-grass
Carya ovata var. ovata - shellbark hickory
Juglans nigra L. - black walnut
Juncus alpinoarticulatus Chaix - northern green rush
Juncus bufonius L. - toad rush
Juncus canadensis J.Gay - Canadian rush
Juncus dudleyi Wiegand - Dudley's rush
Juncus gerardii Loisel. - salt-meadow rush
Juncus nodosus L. - knotted rush
Juncus tenuis Willd. - roadside rush
Juncus torreyi Coville - Torrey's rush
Triglochin maritima L. - seaside arrow-grass
Triglochin palustris L. - slender bog arrow-grass
Ajuga reptans L. - common bugle
Dracocephalum parviflorum Nutt. - American dragonhead
Hedeoma hispida Pursh - rough pennyroyal
Hedeoma pulegioides (L.) Pers. - American pennyroyal
Lycopus asper Greene - rough water-horehound
Lycopus uniflorus Michx. - northern water-horehound
Salvia reflexa Hornem. - Rocky Mountain sage
Scutellaria lateriflora L. - mad-dog skullcap
Stachys arenicola Britton - marsh hedge-nettle
Utricularia intermedia Hayne - northern bladderwort
Utricularia vulgaris L. - great bladderwort
Erythronium albidum Nutt. - white trout-lily
Lilium michiganense Farw. - Turk's-cap lily
Linum sulcatum Riddell - grooved yellow flax
Lythrum salicaria L. - spiked loosestrife
Hibiscus trionum L. - flower-of-an-hour
Malva neglecta Wallr. - common mallow
Trillium flexipes Raf. - nodding wake-robin
Menispermum canadense L. - Canadian moonseed
Menyanthes trifoliata L. - common buckbean
Mollugo verticillata L. - Indian chickweed
Claytonia virginica L. - Virginia spring-beauty
Morus alba L. - white mulberry
Aletris farinosa L. - white stargrass
Nuphar variegata Durand - bull-head pond-lily
Circaea canadensis subsp. canadensis (L.) Hill - broad-leaf enchanter's-nightshade
Epilobium coloratum Biehler - eastern willow-herb
Epilobium hirsutum L. - hairy willow-herb
Epilobium leptophyllum Raf. - fen willow-herb
Epilobium strictum Muhl. ex Spreng. - northeastern willow-herb
Ludwigia polycarpa Short & R.Peter - top-pod water-primrose
Oenothera biennis L. - common evening-primrose
Oenothera parviflora L. - small-flowered evening-primrose
Oenothera perennis L. - small sundrops
Oenothera villosa subsp. villosa - hairy evening-primrose
Liparis loeselii (L.) Rich. - Loesel's twayblade
Platanthera huronensis (Nutt.) Lindl. - tall nothern bog orchid
Platanthera lacera (Michx.) G.Don - ragged fringed orchid
Spiranthes cernua (L.) Rich. - nodding lady's-tresses
Spiranthes magnicamporum Sheviak - Great Plains lady's-tresses
Agalinis tenuifolia (Vahl) Raf. - common false foxglove
Castilleja coccinea (L.) Spreng. - scarlet painted-cup
Orobanche fasciculata Nutt. - clustered broom-rape
Osmunda cinnamomea L. - cinnamon fern
Oxalis dillenii Jacq. - southern yellow wood-sorrel
Oxalis stricta L. - tall wood-sorrel
Oxalis violacea L. - violet wood-sorrel
Dicentra cucullaria (L.) Bernh. - Dutchman's-breeches
Penthorum sedoides L. - ditch stonecrop
Phryma leptostachya L. - American lop-seed
Pinus strobus L. - eastern white pine
Chelone glabra L. - white turtlehead
Linaria vulgaris Mill. - butter-and-eggs
Penstemon pallidus Small - pale beard-tongue
Plantago arenaria Waldst. & Kit. - leafy-stemmed plantain
Plantago rugelii Decne. - Rugel's plantain
Veronica arvensis L. - corn speedwell
Veronica peregrina L. - purslane speedwell
Veronica serpyllifolia L. - thyme-leaved speedwell
Alopecurus aequalis Sobol. - short-awned foxtail
Aristida oligantha Michx. - plains three-awn grass
Bromus arvensis L. - fringed brome
Bromus ciliatus L. - fringed brome
Bromus inermis Leyss. - smooth brome
Bromus kalmii A.Gray - prairie brome
Bromus squarrosus L. - squarrose brome
Bromus tectorum L. - June grass
Dactylis glomerata L. - orchard grass
Dichanthelium linearifolium (Scribn.) Gould - slender-leaved panic grass
Dichanthelium perlongum (Nash) Freckmann - long-stalked panic grass
Digitaria cognata - fall witch grass
Elymus canadensis L. - Great Plains wild-rye
Elymus curvatus Piper - awnless wild-rye
Elymus hystrix L. - glumeless wild-rye
Eragrostis minor Host - little love grass
Glyceria grandis S.Watson - reed manna grass
Glyceria septentrionalis Hitchc. - northern manna grass
Hordeum jubatum L. - squirrel-tail grass
Hordeum vulgare L. - common barley
Lolium perenne L. - perennial rye grass
Lolium perenne subsp. perenne - perennial rye grass
Panicum miliaceum L. - wild proso millet
Panicum virgatum L. - switch grass
Phalaris arundinacea L. - reed canary grass
Poa annua L. - speargrass
Poa compressa L. - wiregrass
Poa languida Hitchc. - weak bluegrass
Poa palustris L. - marsh bluegrass
Poa pratensis L. - Kentucky bluegrass
Puccinellia distans (Jacq.) Parl. - weeping alkali grass
Setaria faberi R.A.W.Herrm. - nodding foxtail
Sorghastrum nutans (L.) Nash - yellow Indian grass
Phlox paniculata L. - summer phlox
Phlox pilosa L. - prairie phlox
Polemonium reptans var. reptans - spreading Jacob's-ladder
Polygala sanguinea L. - purple milkwort
Polygala senega L. - senega root
Fagopyrum esculentum Moench - common buckwheat
Fallopia scandens (L.) Holub - climbing false buckwheat
Persicaria maculosa Gray - spotted lady's-thumb
Polygonum achoreum S.F.Blake - Blake's knotweed
Polygonum tenue Michx. - slender knotweed
Rumex acetosella L. - sheep sorrel
Rumex britannica L. - British dock
Rumex crispus L. - yellow dock
Rumex obtusifolius L. - bitter dock
Pontederia cordata L. - pickerel-weed
Potamogeton crispus L. - curly pondweed
Potamogeton friesii Rupr. - Fries's pondweed
Potamogeton gramineus L. - variable-leaved pondweed
Potamogeton illinoensis Morong - Illinois pondweed
Potamogeton natans L. - floating-leaf pondweed
Potamogeton praelongus Wulfen - white-stemmed pondweed
Potamogeton strictifolius A.Benn. - straight-leaved pondweed
Potamogeton zosteriformis Fernald - flat-stemmed pondweed
Zannichellia palustris L. - horned-pondweed
Lysimachia ciliata L. - fringed loosestrife
Lysimachia nummularia L. - creeping jenny
Lysimachia quadriflora Sims - smooth loosestrife
Lysimachia thyrsiflora L. - tufted loosestrife
Lysimachia vulgaris L. - garden yellow loosestrife
Trientalis borealis Raf. - American starflower
Adiantum pedatum L. - northern maidenhair fern
Actaea pachypoda Elliott - white baneberry
Anemone acutiloba (DC.) G.Lawson - sharp-lobed hepatica
Anemone americana (DC.) H.Hara - round-lobed hepatica
Anemone canadensis L. - meadow anemone
Anemone virginiana L. - tall thimbleweed
Aquilegia canadensis L. - wild columbine
Caltha palustris L. - yellow marsh-marigold
Clematis virginiana L. - devil's-darning-needle
Enemion biternatum Raf. - false rue anemone
Ranunculus abortivus L. - small-flowered buttercup
Ranunculus acris L. - tall buttercup
Ranunculus cymbalaria Pursh - seaside crowfoot
Ranunculus flabellaris Raf. - yellow water crowfoot
Ranunculus pensylvanicus L.f. - Pennsylvania buttercup
Ranunculus sceleratus L. - cursed crowfoot
Thalictrum dioicum L. - quicksilver-weed
Thalictrum revolutum DC. - waxy meadow-rue
Frangula alnus Mill. - glossy buckthorn
Rhamnus alnifolia L'Hér. - alder-leaf buckthorn
Rhamnus cathartica L. - European buckthorn
Agrimonia gryposepala Wallr. - tall hairy agrimony
Amelanchier laevis Wiegand - smooth serviceberry
Comarum palustre L. - purple marshlocks
Crataegus chrysocarpa Ashe - round-leaved hawthorn
Crataegus crus-galli L. - cockspur hawthorn
Crataegus holmesiana Ashe - Holmes' hawthorn
Crataegus scabrida Sarg. - rough hawthorn
Crataegus X lucorum Sarg. - grove hawthorn
Dasiphora fruticosa (L.) Rydb. - shrubby five-fingers
Drymocallis arguta (Pursh) Rydb. - prairie cinquefoil tall cinquefoil tall potentilla
Geum aleppicum Jacq. - yellow avens
Geum canadense Jacq. - white avens
Geum urbanum L. - wood avens
Malus coronaria (L.) Mill. - wild sweet crabapple
Malus pumila Mill. - orchard apple
Potentilla argentea L. - silvery five-fingers
Potentilla norvegica L. - strawberry-weed
Potentilla recta L. - sulphur five-fingers
Potentilla simplex Michx. - old-field cinquefoil
Prunus nigra Aiton - Canadian plum
Rosa arkansana Porter - wild prairie rose
Rosa blanda Aiton - meadow roae
Rosa carolina L. - pasture rose
Rubus flagellaris Willd. - rambling dewberry
Rubus occidentalis L. - black raspberry
Rubus pensilvanicus Poir. - Vicksburg blackberry
Rubus pubescens Raf. - dwarf red blackberry
Spiraea alba var. alba - white meadowsweet
Galium album Mill. - wild madder