Authors: Na.J. Pilla
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Families: 146
Genera: 621
Species: 1632 (species rank)
Total Taxa: 1656 (including subsp. and var.)

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Ruellia humilis - Fringe-Leaf Wild Petunia
Acorus americanus - Several-Vein Sweetflag
Acorus calamus - Single-Vein Sweetflag
Viburnum acerifolium - Maple-Leaf Arrow-Wood
Viburnum lentago - Nanny-Berry
Viburnum opulus - Highbush-Cranberry
Viburnum opulus var. americanum - American Cranberrybush
Viburnum prunifolium - Smooth Blackhaw
Viburnum recognitum - Southern Arrow-Wood
Alisma subcordatum - American Water-Plantain
Alisma triviale - Northern Water-Plantain
Sagittaria brevirostra - Short-Beak Arrowhead
Sagittaria graminea - Grass-Leaf Arrowhead
Sagittaria rigida - Sessile-Fruit Arrowhead
Amaranthus albus - Tumbleweed
Amaranthus hybridus - Smooth Amaranth
Amaranthus powellii - Green Amaranth
Amaranthus tuberculatus - Rough-Fruit Amaranth
Atriplex patula - Halberd-Leaf Orache
Chenopodium album - Lamb's-Quarters
Chenopodium desiccatum - Arid-Land Goosefoot
Chenopodium pratericola - Desert Goosefoot
Chenopodium simplex - Giant-Seed Mock Goosefoot
Chenopodium standleyanum - Standley's Goosefoot
Corispermum nitidum - Shiny Bugseed
Dysphania botrys - Jerusalem-Oak
Froelichia gracilis - Slender Snake-Cotton
Kochia scoparia - Mexican-Fireweed
Salsola tragus - Prickly Russian-Thistle
Allium canadense - Meadow Garlic
Allium cernuum - Nodding Onion
Allium tricoccum var. burdickii - Narrowleaf Wild Leek
Allium vineale - Crow Garlic
Leucojum aestivum - Summer Snowflake
Narcissus poeticus - Poet's Narcissus
Cotinus coggygria - European Smoketree
Rhus aromatica - Fragrant Sumac
Rhus glabra - Smooth Sumac
Rhus typhina - Stag-Horn Sumac
Toxicodendron radicans - Eastern Poison Ivy
Toxicodendron rydbergii - Western Poison Ivy
Asimina triloba - Common Pawpaw
Angelica atropurpurea - Purple-Stem Angelica
Anthriscus caucalis - Burr Chervil
Chaerophyllum procumbens - Spreading Chervil
Cicuta bulbifera - Bulblet-Bearing Water-Hemlock
Cicuta maculata - Spotted Water-Hemlock
Cryptotaenia canadensis - Canadian Honewort
Daucus carota - Queen Anne's-Lace
Erigenia bulbosa - Harbinger-of-Spring
Eryngium yuccifolium - Button Eryngo
Osmorhiza claytonii - Hairy Sweet-Cicely
Oxypolis rigidior - Stiff Cowbane
Pastinaca sativa - Wild Parsnip
Polytaenia nuttallii - Nuttall's Prairie-Parsley
Sanicula canadensis - Canadian Black-Snakeroot
Sanicula marilandica - Maryland Black-Snakeroot
Sanicula odorata - Clustered Black-Snakeroot
Sanicula trifoliata - Large-Fruit Black-Snakeroot
Sium suave - Hemlock Water-Parsnip
Taenidia integerrima - Yellow-Pimpernel
Thaspium barbinode - Hairy-Joint Meadow-Parsnip
Thaspium trifoliatum - Purple Meadow-Parsnip
Torilis japonica - Erect Hedge-Parsley
Zizia aurea - Golden Alexanders
Apocynum androsaemifolium - Spreading Dogbane
Asclepias amplexicaulis - Clasping Milkweed
Asclepias exaltata - Poke Milkweed
Asclepias hirtella - Green Milkweed
Asclepias incarnata - Swamp Milkweed
Asclepias purpurascens - Purple Milkweed
Asclepias sullivantii - Prairie Milkweed
Asclepias syriaca - Common Milkweed
Asclepias tuberosa - Butterfly Milkweed
Asclepias verticillata - Whorled Milkweed
Asclepias viridiflora - Green Comet Milkweed
Vinca minor - Lesser Periwinkle
Vincetoxicum nigrum - Black Swallow-Wort
Ilex opaca - American Holly
Ilex verticillata - Common Winterberry
Arisaema triphyllum - Jack-in-the-Pulpit
Calla palustris - Water-Dragon
Lemna gibba - Inflated Duckweed
Lemna minor - Common Duckweed
Lemna minuta - Least Duckweed
Lemna trisulca - Ivy-Leaf Duckweed
Lemna turionifera - Turion Duckweed
Peltandra virginica - Green Arrow-Arum
Spirodela polyrrhiza - Common Duckmeat
Wolffia brasiliensis - Brazilian Watermeal
Wolffia columbiana - Columbian Watermeal
Aralia hispida - Bristly Sarsaparilla
Aralia nudicaulis - Wild Sarsaparilla
Aralia racemosa - American Spikenard
Hedera helix - English Ivy
Hydrocotyle umbellata - Many-Flower Marsh-Pennywort
Panax quinquefolius - American Ginseng
Panax trifolius - Dwarf Ginseng
Aristolochia serpentaria - Virginia snakeroot
Asarum canadense - Canadian Wild Ginger
Camassia scilloides - Atlantic Camas
Convallaria majalis - European Lily-of-the-Valley
Hyacinthoides non-scripta - English-Bluebell
Maianthemum canadense - False Lily-of-the-Valley
Maianthemum racemosum - Feathery False Solomon's-Seal
Maianthemum stellatum - Starry False Solomon's-Seal
Muscari neglectum - Starch Grape-Hyacinth
Polygonatum biflorum - King Solomon's-Seal
Polygonatum pubescens - Hairy Solomon's-Seal
Scilla siberica - Siberian Squill
Yucca flaccida - Weak-Leaf Yucca
Asplenium platyneuron - Ebony Spleenwort
Achillea millefolium - Woolly Yarrow
Achillea ptarmica - Pearl Yarrow
Ambrosia psilostachya - Perennial Ragweed
Ambrosia trifida - Great Ragweed
Antennaria neglecta - Field Pussytoes
Antennaria parlinii - Parlin's Pussytoes
Anthemis cotula - Stinking Chamomile
Arctium lappa - Greater Burrdock
Arctium minus - Lesser Burrdock
Arnoglossum atriplicifolium - Pale Indian-Plantain
Arnoglossum plantagineum - Groove-Stem Indian-Plantain
Artemisia biennis - Biennial Wormwood
Artemisia campestris - Pacific Wormwood
Artemisia ludoviciana - White Sagebrush
Artemisia vulgaris - Common Wormwood
Bidens aristosa - Bearded Beggarticks
Bidens bipinnata - Spanish-Needles
Bidens cernua - Nodding Burr-Marigold
Bidens connata - Purplestem Beggarticks
Bidens discoidea - Small Beggarticks
Bidens frondosa - Devil's-Pitchfork
Bidens polylepis - Bearded Beggarticks
Bidens trichosperma - Crowned Beggarticks
Bidens tripartita - Three-Lobe Beggarticks
Bidens vulgata - Tall Beggarticks
Carduus nutans - Nodding Plumeless-Thistle
Cirsium altissimum - Tall Thistle
Cirsium arvense - Canadian Thistle
Cirsium discolor - Field Thistle
Cirsium muticum - Swamp Thistle
Cirsium pitcheri - Sand-Dune Thistle
Cirsium vulgare - Bull Thistle
Conoclinium coelestinum - Blue Mistflower
Conyza canadensis - Canadian Horseweed
Conyza ramosissima - Dwarf Horseweed
Coreopsis lanceolata - Lance-Leaf Tickseed
Coreopsis palmata - Stiff Tickseed
Coreopsis tripteris - Tall Tickseed
Crepis capillaris - Smooth Hawk's-Beard
Crepis tectorum - Narrow-Leaf Hawk's-Beard
Doellingeria umbellata - Parasol White-Top
Erechtites hieraciifolius - American Burnweed
Erigeron annuus - Eastern Daisy Fleabane
Erigeron philadelphicus - Philadelphia Fleabane
Erigeron pulchellus - Robin's-Plantain
Erigeron strigosus - Prairie Fleabane
Eupatorium altissimum - Tall Thoroughwort
Eupatorium perfoliatum - Common Boneset
Eupatorium serotinum - Late-Flowering Thoroughwort
Eurybia furcata - Forked Wood-Aster
Eurybia macrophylla - Large-Leaf Wood-Aster
Euthamia graminifolia - Flat-Top Goldentop
Eutrochium maculatum - Spotted Trumpetweed
Eutrochium purpureum - Sweet-Scented Joe-Pye-Weed
Helenium autumnale - Autumn Sneezeweed
Helenium flexuosum - Purple-Head Sneezeweed
Helianthus annuus - Common Sunflower
Helianthus decapetalus - Thin-Leaf Sunflower
Helianthus divaricatus - Woodland Sunflower
Helianthus giganteus - Giant Sunflower
Helianthus grosseserratus - Saw-Tooth Sunflower
Helianthus hirsutus - Whiskered Sunflower
Helianthus mollis - Ashy Sunflower
Helianthus occidentalis - Few-Leaf Sunflower
Helianthus petiolaris - Prairie Sunflower
Helianthus strumosus - Pale-Leaf Woodland Sunflower
Helianthus tuberosus - Jerusalem-Artichoke
Hieracium aurantiacum - Orange Hawkweed
Hieracium caespitosum - Gronovis Hawkweed
Hieracium longipilum - Hairy Hawkweed
Hieracium scabrum - Rough Hawkweed
Hieracium umbellatum - Narrow-Leaf Hawkweed
Hypochaeris radicata - Hairy Cat's-Ear
Inula helenium - Elecampane
Ionactis linariifolia - Flax-Leaf Ankle-Aster
Krigia biflora - Two-Flower Dwarf-Dandelion
Krigia virginica - Virginia Dwarf-Dandelion
Lactuca biennis - Wild Blue Lettuce
Lactuca canadensis - Canadian Blue Lettuce
Lactuca floridana - Woodland Lettuce
Lactuca hirsuta - Hairy Lettuce
Lactuca serriola - Prickly Lettuce
Liatris aspera - Tall Gayfeather
Liatris cylindracea - Ontario Gayfeather
Liatris scariosa var. nieuwlandii - Nieuwland's Gayfeather
Liatris spicata - Dense Gayfeather
Madia sativa - Chilean Tarplant
Matricaria discoidea - Pineapple-Weed
Packera aurea - Golden Groundsel
Packera glabella - Cress-Leaf Groundsel
Packera paupercula - Balsam Groundsel
Packera plattensis - Prairie Groundsel
Prenanthes alba - White Rattlesnake-Root
Prenanthes altissima - Tall Rattlesnake-Root
Prenanthes aspera - rough rattlesnakeroot
Prenanthes crepidinea - nodding rattlesnakeroot
Prenanthes racemosa - purple rattlesnakeroot
Pseudognaphalium obtusifolium - Blunt-Leaf Rabbit-Tobacco
Ratibida pinnata - Gray-Head Mexican-Hat
Rudbeckia hirta - Black-Eyed-Susan
Rudbeckia laciniata - Green-Head Coneflower
Rudbeckia subtomentosa - Sweet Coneflower
Rudbeckia triloba - Brown-Eyed-Susan
Senecio suaveolens - False Indian-Plantain
Silphium laciniatum - Compassplant
Silphium terebinthinaceum - Prairie Rosinweed
Solidago altissima - Tall Goldenrod
Solidago caesia - Wreath Goldenrod
Solidago canadensis - Canadian Goldenrod
Solidago flexicaulis - Zigzag Goldenrod
Solidago gigantea - Late Goldenrod
Solidago juncea - Early Goldenrod
Solidago missouriensis - Missouri Goldenrod
Solidago nemoralis - Gray Goldenrod
Solidago ohioensis - Ohio Goldenrod
Solidago patula - Round-Leaf Goldenrod
Solidago ptarmicoides - Prairie Flat-Top-Goldenrod
Solidago riddellii - Riddell's Goldenrod
Solidago rigida - Hard-Leaf Flat-Top-Goldenrod
Solidago rugosa - Wrinkle-Leaf Goldenrod
Solidago sempervirens - Seaside Goldenrod
Solidago simplex - Sticky Goldenrod
Solidago speciosa - Showy Goldenrod
Solidago uliginosa - Bog Goldenrod
Solidago ulmifolia - Elm-Leaf Goldenrod
Sonchus asper - Spiny-Leaf Sow-Thistle
Sonchus oleraceus - Common Sow-Thistle
Symphyotrichum boreale - Boreal American-Aster
Symphyotrichum cordifolium - Common Blue American-Aster
Symphyotrichum dumosum - Rice Button American-Aster
Symphyotrichum firmum - glossy-leaved aster
Symphyotrichum lanceolatum - White Panicled American-Aster
Symphyotrichum novae-angliae - New England American-Aster
Symphyotrichum oolentangiense - Sky-Blue American-Aster
Symphyotrichum pilosum var. pilosum - White Oldfield American-Aster
Symphyotrichum puniceum - Purple-Stem American-Aster
Symphyotrichum racemosum - Fragile-Stem American-Aster
Symphyotrichum sericeum - Western Silver American-Aster
Symphyotrichum shortii - Short's American-Aster
Tanacetum vulgare - Common Tansy
Taraxacum erythrospermum - Red-Seed Dandelion
Taraxacum officinale - Common Dandelion
Tragopogon dubius - Meadow Goat's-Beard
Tragopogon pratensis - Jack-Go-To-Bed-At-Noon
Vernonia fasciculata - Prairie Ironweed
Vernonia gigantea - Giant Ironweed
Vernonia missurica - Missouri Ironweed
Xanthium strumarium - Rough Cockleburr
Impatiens capensis - Spotted Touch-Me-Not
Impatiens pallida - Pale Touch-Me-Not
Berberis aquifolium - Holly-Leaf Oregon-Grape
Berberis repens - Creeping Oregon-Grape
Berberis thunbergii - Japanese Barberry
Alnus glutinosa - European Alder
Betula nigra - River Birch
Betula papyrifera - Paper Birch
Betula pendula - European Weeping Birch
Betula pumila - Bog Birch
Corylus americana - American Hazelnut
Ostrya virginiana - Eastern Hop-Hornbeam
Campsis radicans - Trumpet-Creeper
Catalpa speciosa - Northern Catalpa
Woodwardia areolata - Netted Chain Fern
Woodwardia virginica - Virginia Chain Fern
Echium vulgare - Common Viper's-Bugloss
Hackelia virginiana - Beggar's-Lice
Mertensia virginica - Virginia Bluebells
Myosotis laxa - Bay Forget-Me-Not
Myosotis scorpioides - True Forget-Me-Not
Myosotis stricta - Blue Scorpion-Grass
Myosotis verna - Spring Forget-Me-Not
Alliaria petiolata - Garlic-Mustard
Arabidopsis lyrata - Lyre-Leaf Thalecress
Barbarea vulgaris - Garden Yellow-Rocket
Berteroa incana - Hoary False Madwort
Boechera laevigata - Smooth Rockcress
Brassica nigra - Black Mustard
Cakile edentula - American Searocket
Capsella bursa-pastoris - Shepherd's-Purse
Cardamine bulbosa - Bulbous Bittercress
Cardamine concatenata - Cut-Leaf Toothwort
Cardamine douglassii - Limestone Bittercress
Cardamine hirsuta - Hairy Bittercress
Cardamine impatiens - Narrow-Leaf Bittercress
Cardamine parviflora - Sand Bittercress
Cardamine pensylvanica - Quaker Bittercress
Diplotaxis muralis - Annual Wallrocket
Draba reptans - Carolina draba
Draba verna - Spring Whitlow-Grass
Erysimum cheiranthoides - Worm-Seed Wallflower
Erysimum repandum - Spreading Wallflower
Hesperis matronalis - Dame's Rocket
Lepidium campestre - Cream-Anther Field Pepperwort
Lepidium densiflorum - Miner's Pepperwort
Lepidium draba - Heart-Pod Pepperwort
Lepidium virginicum - Poorman's-Pepperwort
Lunaria annua - Annual Honesty
Rorippa islandica - Northern Marsh Yellowcress
Rorippa sessiliflora - Stalkless Yellowcress
Sinapis arvensis - Corn-Mustard
Sisymbrium altissimum - Tall Hedge-Mustard
Teesdalia nudicaulis - Common Shepherd's-Cress
Thlaspi arvense - Field Pennycress
Turritis glabra - Tower-Mustard
Pachysandra terminalis - Japanese Moutain-Spurge
Opuntia humifusa - Eastern Prickly-Pear
Campanula americana - American-Bellflower
Campanula aparinoides - Marsh Bellflower
Campanula rapunculoides - Creeping Bellflower
Campanula rotundifolia - Bluebell-of-Scotland
Lobelia cardinalis - Cardinal-Flower
Lobelia inflata - Indian-Tobacco
Lobelia kalmii - Brook Lobelia
Lobelia siphilitica - Great Blue Lobelia
Lobelia spicata - Pale-Spike Lobelia
Triodanis perfoliata - Clasping-Leaf Venus'-Looking-Glass
Celtis occidentalis - Common Hackberry
Celtis tenuifolia - Dwarf Hackberry
Humulus japonicus - Japanese Hop
Humulus lupulus - Common Hop
Dipsacus fullonum - Fuller's Teasel
Lonicera bella - Bell's honeysuckle
Lonicera dioica - Limber Honeysuckle
Lonicera japonica - Japanese Honeysuckle
Lonicera maackii - Amur Honeysuckle
Lonicera reticulata - Grape Honeysuckle
Lonicera ruprechtiana - Manchurian Honeysuckle
Lonicera tatarica - Twinsisters
Lonicera x bella - Bell's honeysuckle
Lonicera x minutiflora - smallflower honeysuckle
Lonicera x xylosteoides - fly honeysuckle
Triosteum aurantiacum - Orange-Fruit Horse-Gentian
Valerianella chenopodiifolia - Goose-Foot Cornsalad
Arenaria serpyllifolia - Thyme-Leaf Sandwort
Cerastium brachypodum - Short-Stalk Mouse-Ear Chickweed
Cerastium pumilum - European Mouse-Ear Chickweed
Cerastium semidecandrum - Five-Stamen Mouse-Ear Chickweed
Dianthus armeria - Deptford Pink
Dianthus barbatus - Sweetwilliam
Gypsophila scorzonerifolia - Garden Baby's-Breath
Holosteum umbellatum - Jagged-Chickweed
Minuartia tenella - slender stitchwort
Moehringia lateriflora - bluntleaf sandwort
Myosoton aquaticum - Giant-Chickweed
Scleranthus annuus - Annual Knawel
Silene antirrhina - Sleepy Catchfly
Silene armeria - Sweet-William catchfly
Silene coronaria - Rose Catchfly
Silene csereii - Balkan Catchfly
Silene dioica - Red Catchfly
Silene latifolia - Bladder-Campion
Silene noctiflora - Night-Flowering Catchfly
Silene stellata - Widow's-Frill
Silene vulgaris - Maiden's-Tears
Spergularia media - Satin-Flower
Stellaria graminea - Grass-Leaf Starwort
Stellaria longifolia - Long-Leaf Starwort
Stellaria media - Common Chickweed
Celastrus orbiculatus - Asian Bittersweet
Celastrus scandens - American Bittersweet
Euonymus alatus - Winged Spindletree
Euonymus europaeus - European Spindletree
Euonymus fortunei - Winter-Creeper
Euonymus hamiltonianus - Hamilton's Strawberry-Bush
Euonymus obovatus - Running Strawberry-Bush
Parnassia glauca - Fen Grass-of-Parnassus
Ceratophyllum echinatum - Spineless Hornwort
Helianthemum bicknellii - hoary frostweed
Helianthemum canadense - Canada frostweed
Hudsonia tomentosa - Sand Golden-Heather
Lechea minor - Thyme-Leaf Pinweed
Lechea mucronata - Hairy Pinweed
Lechea pulchella - Leggett's Pinweed
Lechea stricta - Prairie Pinweed
Lechea tenuifolia - Narrow-Leaf Pinweed
Lechea villosa - Hairy Pinweed
Uvularia grandiflora - Large-Flower Bellwort
Uvularia sessilifolia - Sessile-Leaf Bellwort
Commelina communis - Asiatic Dayflower
Commelina erecta - White-Mouth Dayflower
Tradescantia subaspera - Zigzag Spiderwort
Calystegia sepium subsp. sepium - hedge false bindweed
Calystegia spithamaea - Low False Bindweed
Convolvulus arvensis - Field Bindweed
Cuscuta cephalanthi - Buttonbush Dodder
Cuscuta coryli - Hazel Dodder
Cuscuta glomerata - Rope Dodder
Cuscuta pentagona - Bush-Clover Dodder
Cuscuta polygonorum - Smartweed Dodder