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Families: 126
Genera: 559
Species: 1296 (species rank)
Total Taxa: 1326 (including subsp. and var.)

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Acorus calamus L. - sweet-flag
Viburnum acerifolium L. - maple-leaved viburnum
Viburnum dentatum L. - southern arrow-wood
Viburnum lantana L. - wayfaring-tree
Viburnum lentago L. - sheepberry
Viburnum opulus L. - high-bush cranberry
Viburnum prunifolium L. - smooth black-haw
Viburnum trilobum Marshall - high-bush cranberry
Alisma sp. L. - Water-plantain
Alisma triviale Pursh - northern water-plantain
Sagittaria sp. L. - Arrowhead
Sagittaria rigida Pursh - stiff arrow-head
Amaranthus albus L. - white amaranth
Amaranthus blitoides S.Watson - prostrate pigweed
Amaranthus hybridus L. - smooth pigweed
Amaranthus retroflexus L. - wild-beet amaranth
Atriplex hortensis L. - garden orache
Atriplex patula L. - spear saltbush
Atriplex rosea L. - tumbling saltweed
Celosia argentea L. - silver cock's-comb
Chenopodium glaucum var. glaucum - oak-leaved goosefoot
Chenopodium pratericola Rydb. - narrow-leaf goosefoot
Chenopodium simplex (Torr.) Raf. - maple-leaved goosefoot
Chenopodium strictum Roth - late-flowering goosefoot
Corispermum pallasii Steven - Siberian bugseed
Salsola tragus L. - tumbleweed
Allium cernuum Roth - nodding wild onion
Rhus glabra L. - smooth sumac
Rhus typhina L. - staghorn sumac
Angelica atropurpurea L. - purple-stem angelica
Cicuta bulbifera L. - bulblet water-hemlock
Cicuta maculata L. - spotted water-hemlock
Conium maculatum L. - poison-hemlock
Daucus carota L. - wild carrot
Eryngium yuccifolium Michx. - rattlesnake-master
Heracleum maximum W.Bartram - American cow-parsnip
Osmorhiza longistylis (Torr.) DC. - smooth sweet cicely
Pastinaca sativa L. - wild parsnip
Polytaenia nuttallii DC. - prairie-parsley
Sanicula marilandica L. - Maryland sanicle
Sanicula trifoliata E.P.Bicknell - large-fruited black snakeroot
Sium suave Walter - water-parsnip
Zizia aptera (A.Gray) Fernald - heart-leaved meadow-parsnip
Apocynum androsaemifolium L. - spreading dogbane
Asclepias sp. - Milkweed
Asclepias exaltata L. - tall milkweed
Asclepias ovalifolia Decne. - oval-leaved milkweed
Asclepias verticillata L. - whorled milkweed
Asclepias viridiflora Raf. - short green milkweed
Vinca minor L. - running-myrtle
Ilex verticillata (L.) A.Gray - common winterberry
Calla palustris L. - wild calla
Lemna trisulca L. - star duckweed
Lemna turionifera Landolt - Turion duckweed
Aralia hispida Vent. - bristly sarsaparilla
Aralia nudicaulis L. - wild sarsaparilla
Aralia racemosa L. - life-of-man
Panax trifolius L. - groundnut
Asarum canadense L. - wild-ginger
Asparagus officinalis L. - garden asparagus
Maianthemum canadense Desf. - wild lily-of-the-valley
Maianthemum stellatum (L.) Link - starry false Solomon's-seal
Maianthemum trifolium (L.) Sloboda - three-leaf Solomon's-plume
Ambrosia psilostachya DC. - western ragweed
Ambrosia trifida L. - horse-cane
Antennaria neglecta Greene - field pussy-toes
Anthemis arvensis L. - corn chamomile
Anthemis cotula L. - stinking-cotula
Arctium lappa L. - great burdock
Arnoglossum plantagineum Raf. - prairie Indian-plantain
Artemisia annua L. - sweet wormwood
Artemisia biennis Willd. - biennial wormwood
Bidens sp. L. - Beggarticks
Bidens cernua L. - nodding bur-marigold
Bidens frondosa L. - devil's beggar-ticks
Bidens tripartita L. - swamp tickseed
Bidens vulgata Greene - tall beggar-ticks
Carduus nutans L. - nodding thistle
Centaurea cyanus L. - cornflower
Centaurea melitensis L. - Maltese star-thistle
Centaurea nigrescens Willd. - Vochin knapweed
Cirsium muticum Michx. - swamp thistle
Coreopsis lanceolata L. - sand tickseed
Coreopsis tinctoria Nutt. - plains tickseed
Cosmos bipinnatus Cav. - common garden cosmos
Doellingeria umbellata (Mill.) Nees - tall flat-topped white aster
Echinacea purpurea (L.) Moench - eastern purple coneflower
Echinops sphaerocephalus L. - great globe-thistle
Erigeron annuus (L.) Pers. - eastern daisy fleabane
Eupatorium altissimum L. - tall thoroughwort
Eupatorium serotinum Michx. - late-flowering thoroughwort
Eurybia furcata (E.S.Burgess) G.L.Nesom - midwestern white heart-leaved aster
Eurybia macrophylla (L.) Cass. - large-leaved aster
Euthamia graminifolia (L.) Nutt. - grass-leaved goldenrod
Eutrochium maculatum L. - spotted Joe-Pye-weed
Hasteola suaveolens (L.) Pojark. - sweet Indian-plantain
Helenium autumnale L. - common sneezeweed
Helianthus sp. L. - Sunflower
Helianthus annuus L. - garden sunflower
Helianthus decapetalus L. - thin-leaved sunflower
Helianthus giganteus L. - tall sunflower
Helianthus hirsutus Raf. - rough sunflower
Helianthus maximiliani Schrad. - Maximilian's sunflower
Helianthus strumosus L. - rough-leaved sunflower
Helianthus tuberosus L. - woodland sunflower
Heliopsis helianthoides (L.) Sweet - sunflower-everlasting
Hieracium scabrum Michx. - sticky hawkweed
Hieracium umbellatum L. - northern hawkweed
Hypochaeris radicata L. - spotted cat's-ear
Inula helenium L. - elecampane
Lactuca canadensis L. - wild lettuce
Lactuca serriola L. - prickly lettuce
Lapsana communis L. - nipplewort
Liatris aspera Michx. - rough gayfeather
Liatris pycnostachya (L.) Willd. - thick-spike gay-feather
Liatris spicata var. spicata - sessile-headed blazing-star
Packera aurea (L.) A.Löve & D.Löve - heart-leaved groundsel
Polymnia canadensis L. - white-flowered leaf-cup
Prenanthes alba L. - white rattlesnakeroot
Ratibida pinnata (Vent.) Barnhart - pinnate prairie coneflower
Rudbeckia laciniata L. - wild golden-glow
Rudbeckia triloba - three-lobed coneflower
Rudbeckia triloba var. triloba - three-lobed coneflower
Senecio vulgaris L. - common groundsel
Silphium laciniatum L. - compass-plant
Solidago canadensis L. - common goldenrod
Solidago flexicaulis L. - zigzag goldenrod
Solidago gigantea Aiton - smooth goldenrod
Solidago juncea Aiton - early goldenrod
Solidago nemoralis Aiton - old-field goldenrod
Solidago riddellii Frank - Riddell's goldenrod
Solidago rigida L. - stiff goldenrod
Solidago uliginosa Nutt. - northern bog goldenrod
Sonchus sp. L. - Sow-Thistle
Sonchus arvensis L. - perennial sow-thistle
Sonchus asper (L.) Hill - spiny-leaf sow-thistle
Sonchus oleraceus L. - field sow-thistle
Tagetes erecta L. - French marigold
Tanacetum balsamita L. - mint-geranium
Tragopogon dubius Scop. - yellow salsify
Tragopogon porrifolius L. - vegetable-oyster
Tragopogon pratensis L. - yellow goat's-beard
Vernonia fasciculata Michx. - smooth ironweed
Xanthium strumarium L. - rough cocklebur
Impatiens balsamina L. - spotted snap-weed
Impatiens capensis Meerb. - spotted touch-me-not
Berberis thunbergii DC. - Japanese barberry
Berberis vulgaris L. - European barberry
Podophyllum peltatum L. - wild mandrake
Betula cordifolia Regel - mountain white birch
Betula nigra L. - river birch
Betula pendula Roth - weeping birch
Betula pumila L. - swamp birch
Corylus americana Walter - American hazelnut
Catalpa ovata G.Don - Chinese catalpa
Amsinckia lycopsoides Lehm. - tarweed fiddle-neck
Cynoglossum boreale Fernald - northern wild comfrey
Echium vulgare L. - viper's-bugloss
Hydrophyllum virginianum L. - Virginia waterleaf
Lithospermum latifolium Michx. - broad-leaved gromwell
Lithospermum officinale L. - European gromwell
Myosotis scorpioides L. - water scorpion-grass
Symphytum officinale L. - common comfrey
Arabis caucasica Willd. - garden rock-cress
Arabis pycnocarpa M.Hopkins - hairy rock-cress
Berteroa incana (L.) DC. - hoary-alyssum
Brassica sp. L. - Mustard
Camelina microcarpa Andrz. ex DC. - small-fruited false flax
Camelina sativa (L.) Crantz - large-seed false flax
Cardamine douglassii Britton - purple spring-cress
Cardamine flexuosa With. - bending bitter-cress
Cardamine parviflora L. - small-flowered bitter-cress
Cardamine pensylvanica Muhl. ex Willd. - Pennsylvania bitter-cress
Diplotaxis sp. DC. - Wallrocket
Diplotaxis muralis (L.) DC. - stinking wall-rocket
Erysimum cheiranthoides L. - worm-seed wallflower
Hesperis matronalis L. - dame's rocket
Iberis umbellata L. - globe candytuft
Lepidium sp. L. - Pepperwort
Lepidium densiflorum Schrad. - small peppergrass
Lepidium ruderale L. - stinking pepper-weed
Lepidium virginicum - Virginia pepper-weed
Rorippa sp. Scop. - Yellowcress
Rorippa palustris (L.) Besser - common yellow-cress
Rorippa sylvestris (L.) Besser - creeping yellow-cress
Sinapis arvensis L. - charlock mustard
Sisymbrium altissimum L. - tall tumble mustard
Sisymbrium loeselii L. - tall hedge-mustard
Thlaspi arvense L. - field pennycress
Turritis glabra L. - tower rock-cress
Campanula rapunculoides L. - rover bellflower
Lobelia cardinalis - cardinal-flower
Lobelia inflata L. - Indian-tobacco
Lobelia kalmii L. - Ontario lobelia
Lobelia siphilitica L. - great blue lobelia
Lobelia spicata Lam. - spiked lobelia
Cannabis sativa L. - marijuana
Celtis occidentalis L. - northern hackberry
Diervilla lonicera Mill. - northern bush-honeysuckle
Dipsacus laciniatus L. - cut-leaved teasel
Lonicera dioica L. - red honeysuckle
Lonicera japonica Thunb. - Japanese honeysuckle
Lonicera maackii (Rupr.) Maxim. - Maack's honeysuckle
Lonicera morrowii A.Gray - Morrow's honeysuckle
Lonicera oblongifolia (Goldie) Hook. - swamp fly honeysuckle
Lonicera reticulata Raf. - yellow honeysuckle
Lonicera tatarica L. - Tartarian honeysuckle
Lonicera villosa (Michx.) Schult. - mountain fly honeysuckle
Lonicera X bella Zabel - white-bell honeysuckle
Lonicera xylosteum L. - European fly honeysuckle
Triosteum aurantiacum E.P.Bicknell - orange-fruit horse-gentian
Triosteum aurantiacum var. aurantiacum - orange-fruit horse-gentian
Valeriana officinalis L. - garden valerian
Arenaria serpyllifolia - thyme-leaved sandwort
Atocion armeria (L.) Raf. - sweet-William silene
Cerastium nutans - nodding mouse-ear chickweed
Cerastium tomentosum L. - snow-in-summer
Dianthus armeria - Deptford pink
Dianthus plumarius - garden pink
Petrorhagia saxifraga - saxifrage pink
Silene antirrhina L. - sleepy silene
Silene csereii Baumg. - glaucous campion
Silene dichotoma - forked catchfly
Silene latifolia Poir. - white cockle
Silene noctiflora L. - sticky cockle
Stellaria holostea L. - greater stichwort
Stellaria longifolia Muhl. ex Willd. - long-leaved stitchwort
Stellaria media (L.) Vill. - common chickweed
Celastrus orbiculatus Thunb. - Oriental bittersweet
Celastrus scandens L. - climbing bittersweet
Euonymus alatus (Thunb.) Siebold - winged spindle-tree
Euonymus europaeus L. - European spindle-tree
Euonymus obovatus Nutt. - running strawberry-bush
Parnassia glauca Raf. - fen grass-of-Parnassus
Crocanthemum canadense (L.) Britton - long-branch frostweed
Polanisia dodecandra (L.) DC. - rough-seed clammy-weed
Uvularia grandiflora Sm. - large-flowered bellwort
Commelina communis L. - common dayflower
Tradescantia bracteata Small - sticky spiderwort
Tradescantia ohiensis Raf. - smooth spiderwort
Calystegia sepium (L.) R.Br. - hedge false bindweed
Convolvulus arvensis L. - field bindweed
Cuscuta cephalanthi Engelm. - buttonbush dodder
Cuscuta polygonorum Engelm. - smartweed dodder
Ipomoea purpurea (L.) Roth - tall morning-glory
Cornus alternifolia L.f. - pagoda dogwood
Cornus canadensis L. - dwarf cornel
Cornus drummondii C.A.Mey. - northern roughleaf dogwood
Cornus rugosa Lam. - round-leaved dogwood
Cornus sericea L. - red osier dogwood
Sedum acre L. - yellow sedum
Cucumis melo L. - muskmelon
Thuja occidentalis L. - northern white-cedar
Carex albursina E.Sheld. - white bear sedge
Carex aurea Nutt. - golden-fruited sedge
Carex bicknellii Britton - Bicknell's sedge
Carex blanda Dewey - wood sedge
Carex buxbaumii Wahlenb. - Buxbaum's sedge
Carex communis var. communis - fibrous-root sedge
Carex comosa Boott - bristly sedge
Carex diandra Schrank - lesser panicled sedge
Carex digitalis var. digitalis - slender woodland sedge
Carex disperma Dewey - two-seeded bog sedge
Carex eburnea Boott - bristle-leaf sedge
Carex formosa Dewey - handsome sedge
Carex gracilescens Steud. - slender wood sedge
Carex gracillima Schwein. - graceful sedge
Carex granularis Muhl. ex Willd. - limestone meadow sedge