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Families: 115
Genera: 401
Species: 768 (species rank)
Total Taxa: 821 (including subsp. and var.)

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Cypripedium acaule Aiton - small pink lady's-slipper
Cypripedium parviflorum Salisb. - yellow lady's-slipper
Goodyera pubescens (Willd.) R.Br. - downy rattlesnake-plantain
Malaxis unifolia Michx. - green adder's-mouth
Platanthera lacera (Michx.) G.Don - ragged fringed orchid
Platanthera psycodes (L.) Lindl. - lesser purple fringed orchid
Spiranthes lacera var. lacera - northern slender lady's-tresses
Agalinis tenuifolia (Vahl) Raf. - common false foxglove
Castilleja coccinea (L.) Spreng. - scarlet painted-cup
Osmunda claytoniana L. - interrupted fern
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
Callitriche palustris L. - vernal water-starwort
Chelone glabra L. - white turtlehead
Gratiola neglecta Torr. - clammy hedge-hyssop
Linaria vulgaris Mill. - butter-and-eggs
Plantago patagonica Jacq. - woolly plantain
Plantago rugelii Decne. - Rugel's plantain
Alopecurus aequalis Sobol. - short-awned foxtail
Alopecurus pratensis L. - meadow foxtail
Aristida basiramea Engelm. ex Vasey - fork-tip three-awn grass
Aristida tuberculosa Nutt. - seaside three-awn
Bouteloua curtipendula - side-oats grama
Bromus arvensis L. - fringed brome
Bromus inermis Leyss. - smooth brome
Bromus kalmii A.Gray - prairie brome
Bromus squarrosus L. - squarrose brome
Bromus tectorum L. - June grass
Cinna arundinacea L. - stout wood-reed
Dactylis glomerata L. - orchard grass
Dichanthelium latifolium (L.) Harvill - broad-leaved panic grass
Digitaria cognata - fall witch grass
Elymus canadensis L. - Great Plains wild-rye
Elymus hystrix var. hystrix - glumeless wild-rye
Elymus riparius Wiegand - eastern riverbank wild-rye
Elymus wiegandii Fernald - Wiegand's wild-rye
Glyceria borealis (Nash) Batch. - boreal manna grass
Glyceria grandis S.Watson - reed manna grass
Holcus lanatus L. - velvet grass
Hordeum jubatum L. - squirrel-tail grass
Lolium perenne subsp. perenne - perennial rye grass
Panicum virgatum L. - switch grass
Phalaris arundinacea L. - reed canary grass
Poa alsodes A.Gray - woodland bluegrass
Poa annua L. - speargrass
Poa compressa L. - wiregrass
Poa palustris L. - marsh bluegrass
Poa pratensis L. - Kentucky bluegrass
Setaria faberi R.A.W.Herrm. - nodding foxtail
Sorghastrum nutans (L.) Nash - yellow Indian grass
Polemonium reptans var. reptans - spreading Jacob's-ladder
Fallopia cilinodis (Michx.) Holub - fringed black bindweed
Persicaria maculosa Gray - spotted lady's-thumb
Polygonum tenue Michx. - slender knotweed
Rumex acetosella L. - sheep sorrel
Rumex crispus L. - curly dock
Rumex patientia L. - patience dock
Pontederia cordata L. - pickerel-weed
Potamogeton amplifolius Tuck. - large-leaved pondweed
Potamogeton crispus L. - curly pondweed
Potamogeton epihydrus Raf. - ribbon-leaved pondweed
Potamogeton foliosus - leafy pondweed
Potamogeton natans L. - floating-leaf pondweed
Potamogeton nodosus Poir. - long-leaved pondweed
Potamogeton pusillus L. - small pondweed
Potamogeton robbinsii Oakes - Robbins' pondweed
Potamogeton spirillus Tuck. - spiral-fruited pondweed
Potamogeton zosteriformis Fernald - flat-stemmed pondweed
Lysimachia ciliata L. - fringed loosestrife
Lysimachia hybrida Michx. - river loosestrife
Lysimachia lanceolata Walter - lance-leaved loosestrife
Lysimachia quadrifolia L. - whorled 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. - virgin's-bower
Coptis trifolia (L.) Salisb. - three-leaved gold-thread
Enemion biternatum Raf. - false rue anemone
Ranunculus abortivus L. - small-flowered buttercup
Ranunculus acris L. - tall buttercup
Ranunculus hispidus Michx. - rough buttercup
Ranunculus pensylvanicus L.f. - Pennsylvania buttercup
Thalictrum dioicum L. - quicksilver-weed
Ceanothus herbaceus Raf. - prairie red-root
Agrimonia gryposepala Wallr. - tall hairy agrimony
Agrimonia striata Michx. - roadside agrimony
Amelanchier sanguinea - round-leaved serviceberry
Comarum palustre L. - purple marshlocks
Crataegus macrosperma Ashe - eastern hawthorn
Drymocallis arguta (Pursh) Rydb. - prairie cinquefoil tall cinquefoil tall potentilla
Geum canadense Jacq. - white avens
Potentilla norvegica L. - strawberry-weed
Potentilla simplex Michx. - old-field cinquefoil
Prunus nigra Aiton - Canadian plum
Prunus pumila L. - sand cherry
Prunus serotina Ehrh. - wild black cherry
Prunus virginiana L. - chokecherry
Rosa blanda Aiton - meadow roae
Rosa carolina L. - pasture rose
Rubus flagellaris Willd. - rambling dewberry
Rubus hispidus L. - swamp dewberry
Rubus occidentalis L. - black raspberry
Rubus pubescens Raf. - dwarf red blackberry
Rubus setosus Bigelow - Wheeler's blackberry
Spiraea alba var. alba - white meadowsweet
Galium aparine L. - sticky-willy
Galium boreale L. - northern bedstraw
Galium triflorum Michx. - sweet-scented bedstraw
Houstonia longifolia Gaertn. - long-leaved bluets
Mitchella repens L. - partridgeberry
Zanthoxylum americanum Mill. - northern prickly-ash
Populus grandidentata Michx. - large-toothed aspen
Populus tremuloides Michx. - trembling aspen
Salix humilis Marshall - upland willow
Salix interior Rowlee - sandbar willow
Acer ginnala Maxim. - Amur maple
Acer negundo L. - box elder
Acer saccharinum L. - soft maple
Aesculus glabra - Ohio buckeye
Heuchera richardsonii R.Br. - Richardson's alumroot
Mitella diphylla L. - two-leaf miterwort
Scrophularia lanceolata Pursh - lance-leaf figwort
Verbascum thapsus L. - giant mullein
Smilax ecirrhata S.Watson - upright carrion-flower
Smilax illinoensis Mangaly - Illinois greenbrier
Smilax lasioneura Hook. - hairy carrion-flower
Smilax tamnoides L. - hellfetter
Physalis virginiana var. virginiana - Virginia ground-cherry
Solanum ptychanthum Dunal - West Indian nightshade
Staphylea trifolia L. - American bladdernut
Sparganium emersum Rehmann - narrow-leaved bur-reed
Typha angustifolia L. - narrow-leaved cat-tail
Typha latifolia L. - common cat-tail
Typha X glauca Godr. - white cat-tail
Ulmus americana L. - white elm
Ulmus pumila L. - Siberian elm
Ulmus rubra Muhl. - slippery elm
Boehmeria cylindrica (L.) Sw. - small-spike false nettle
Laportea canadensis (L.) Wedd. - Canadian wood-nettle
Parietaria pensylvanica Muhl. ex Willd. - Pennsylvanian pellitory
Pilea fontana (Lunell) Rydb. - lesser clearweed
Pilea pumila (L.) A.Gray - Canadian clearweed
Verbena hastata L. - swamp verbena
Verbena urticifolia L. - white vervain
Viola canadensis L. - tall white violet
Viola cucullata Aiton - marsh blue violet
Viola novae-angliae House - New England blue violet
Viola pedata f. rosea Sanders - bird's-foot violet
Viola sagittata Aiton - arrow-leaved violet
Viola sagittata var. sagittata - arrow-leaved violet
Viola tricolor L. - pansy violet
Vitis riparia Michx. - river bank grape