A

• Abrus precatorius Critical Precatory Bean, Rosary Pea
• Abutilon spp. Critical Indian Mallows, Velvetleaf
• Acacia berlandieri Critical Guajillo
• Acalypha ostryaefolia Critical Hophornbeam Copperleaf
• Acer rubrum Moderate Red Maple, Carolina Red Maple
• Achillea millefolium Mild Common Yarrow Complex, Common Yarrow
• Acokanthera spp. Moderate Poison Bushes, Bushmans Poison
• Aconitum spp. Moderate Monkshoods, Baneberries, Cohoshes, And Winter Aconites
• Actaea pachypoda Critical White Baneberry, Red-Fruited White Baneberry
• Actaea rubra Moderate Red Baneberry, White-Fruited Red Baneberry
• Actinomeris spp. Critical Crownbeard, Wingstem
• Adenium obesum Critical Desert Rose, Impala Lily
• Aesculus hippocastanum Critical Horse-Chestnut
• Aesculus spp. Severe Buckeyes, Horse-Chestnut
• Aethusa cynapium Critical Fool's Parsley
• Agapanthus praecox Critical Blue Lily, Common Bluelily
• Agave americana Critical American Century Plant, American Century Plant
• Agave lecheguilla Critical Lechuguilla
• Ageratina altissima Critical White Snakeroot, White Snakeroot
• Aglaonema modestum Mild Chinese Evergreen
• Agrostemma githago Critical Corn Cockle
• Aleurites moluccana Critical Candlenut
• Alliaria petiolata, Critical Garlic Mustard
• Allium ampeloprasum Severe Wild Leek Complex, Wild Leek
• Allium cepa Severe Common Onion, Shallot
• Allium sativum Severe Garlic, Serpent Garlic
• Allium schoenoprasum Severe Chives, Wild Chives
• Alocasia spp. Mild Elephant's-Ears, Asian Taro
• Aloe nobilis Critical
• Aloe vera Mild Aloe Vera, Chinese Aloe
• Aloysia triphylla Mild Lemon Verbena
• Amaranthus spp. Critical Pinks, Cactuses, And Allies, Amaranths
• Amaryllis spp. Moderate Amaryllis, Onions, And Allies, Amaryllis
• Ambrosia dumosa Critical Burrobush
• Amianthium muscaetoxicum Critical Fly Poison
• Ammi majus Mild Bullwort, False Queen Anne's Lace
• Amsinckia spp. Severe Fiddlenecks, Common Fiddleneck
• Ananas comosus Critical Pineapple, Red Pineapple
• Anemone coronaria Critical Poppy Anemone
• Anemone spp. Critical Buttercup Family, Anemones, Buttercups, Larkspurs And Allies
• Anthemis cotula Moderate Stinking Chamomile
• Anthemis nobilis Moderate Chamomile
• Anthurium scherzerianum Mild Flamingo Flower
• Antirrhinum majus Critical Snapdragon Complex, Snapdragon
• Apocynum cannabinum Critical Hemp Dogbane
• Apocynum spp. Mild Dogbane Family, Dogbanes
• Aquilegia Critical Columbines, Common Columbine
• Aralia spinosa Mild Devil's Walkingstick
• Araujia sericifera Severe White Bladderflower
• Arctium spp. Moderate Burdocks, Lesser Burdock
• Ardisia crenata Critical Coralberry
• Areca catechu Critical Areca Palm
• Argemone spp. Severe Prickly Poppies, Mexican Poppy
• Argyreia nervosa Critical Elephant Creeper
• Arisaema triphyllum Mild Jack-In-The-Pulpit, Common Jack-In-The-Pulpit
• Aristolochia spp. Critical Pipevines And Birthworts, Pepper Plants, Birthworts, And Allies
• Artemisia dracunculus Mild Tarragon
• Artemisia spp. Critical Wormwoods And Sagebrushes, Common Mugwort
• Arum maculatum Mild Cuckoo-Pint, Lords And Ladies
• Arum Palaestinum Mild Palestine Arum
• Asclepias spp. Critical Milkweeds, Common Milkweed
• Asclepias tuberosa Critical Butterfly Milkweed, Rolfs' Milkweed
• Asparagus densiflorus Moderate Sprenger's Asparagus, Emerald Feather
• Asparagus setaceus Critical Common Asparagus Fern, Asparagus plumosus
• Asparagus spp. Critical Agaves, Orchids, Irises, And Allies, Agave And Allies
• Asplenium bulbiferum Critical Hen And Chicks Fern, Drooping Spleenwort
• Asplenium spp. Critical Spleenworts, Eupolypods II
• Astragalus spp. Moderate Milkvetches, Wild Liquorice
• Atropa belladonna Moderate Deadly Nightshade
• Aucuba japonica Critical Japanese Aucuba

B

• Baccharis spp. Critical Coyote Brush, Section Baccharis
• Barbarea orthoceras Severe American Yellowrocket
• Begonia semperflorens Critical Wax Begonia, Bedding Begonia
• Begonia spp. Critical Begonias, Bougainvilleas
• Bellis perennis Critical Common Daisy
• Berteroa incana Severe Hoary Alyssum
• Borago officinalis Mild Borage
• Brassaia actinophylla Mild Australian Umbrella Tree
• Brassica kaber Severe Charlock Mustard
• Brassica spp. Severe Mustards, Capers, And Allies, Mustard Family
• Brunfelsia spp. Severe Raintrees, Brazil Raintree
• Bryonia Critical White Bryony, White Bryony
• Buxus spp. Critical Boxes, Common Box

C

• Caesalpinia pulcherrima Mild Peacock Flower
• Caladium spp. Mild Caladium, Heart Of Jesus
• Calamansi Mild Calamondin, Kumquat
• Calendula officinalis Critical Pot Marigold
• Caltha palustris Critical Marsh Marigold
• Calystegia sepium Critical Hedge Bindweed, American Bindweed
• Campanula spp. Critical Sunflowers, Bellflowers, Fanflowers, And Allies, Bellflowers
• Campsis radicans Critical American Trumpet Vine
• Cannabis sativa Critical Cannabis, Ruderalis Marijuana
• Carum carvi Mild Caraway
• Caulophyllum thalictroides Critical Blue Cohosh
• Celastrus scandens Moderate American Bittersweet
• Centaurea repens Severe Russian Knapweed
• Centaurea solstitialis Critical Yellow Star-Thistle
• Cestrum spp. Severe Cestrums, Night Jessamine
• Chamaedorea spp. Critical Parlour Palm, Pacaya Palm
• Chelidonium majus Critical Greater Celandine, Common Greater Celandine
• Chenopodium ambrosioides Mild Mexican Tea, Wormseed
• Chenopodium botrys Mild Jerusalem Oak, Low Goosefoot
• Chlorophytum comosum Critical Spider Plant
• Chrysanthemum spp. Mild Chamomiles, Yarrows, And Allies, Chrysanthemums
• Cicuta maculata Critical Water Hemlock, Common Water-Hemlock
• Cicuta spp. Critical Water Hemlocks, Water Hemlock
• Cineraria spp. Critical Cinerarias, Dusty Miller
• Citrus aurantifolia Mild Key Lime
• Citrus Aurantium Mild Orange, Key Lime
• Citrus limonia Severe Lemon, Rangpur
• Citrus mitis Severe Kumquat
• Citrus paradisi Mild Orange, Citrus
• Citrus sinensis Mild Orange
• Clematis spp. Mild Clematis And Leatherflowers, Buttercup Family
• Clerodendrum thomsoniae Critical Bleeding Glory-Bower
• Clivia spp. Moderate Bush Lilies, Natal Lily
• Clusia major Mild
• Cnidoscolus texanus Critical Texas Bull Nettle
• Codiaeum variegatum Critical Variegated Croton, Variegated Croton
• Coffea arabica Critical Coffee, Ibo Coffee
• Colchicum autumnale Critical Autumn Crocus Complex, Autumn Crocus
• Coleus amboinicus Mild Indian Borage
• Colocasia esculenta Severe Taro
• Colocasia spp. Mild Elephant Ears, Taro
• Conium maculatum Critical Poison Hemlock
• Convallaria majalis Severe European Lily Of The Valley, American Lily-Of-The-Valley
• Cordyline australis Mild New Zealand Cabbage Tree
• Cordyline spp. Critical Cabbage Trees And Allies, Ti
• Cordyline terminalis Mild Ti
• Cornus canadensis Critical Canadian Bunchberry
• Cornus spp. Critical Dogwoods, Red Osier Dogwood
• Coronilla varia Severe Purple Crownvetch
• Cotyledon orbiculata Severe Pig's Ear, Common Pigs Ear
• Crassula arborescens Moderate Silver Dollar Plant, Bokkeveld Tree Crassula
• Crassula argentea Mild Jade Plant
• Crotalaria spp. Critical Rattlepods, Showy Rattlebox
• Cryptanthus Critical Earth Stars, Annual Cryptanthas
• Cucumis anguria Critical Bur Cucumber
• Cupressocyparis leylandii Critical Leyland Cypress
• Curio rowleyanus Critical String-Of-Beads, String Of Dolphins
• Cycadophyta Critical Cycads
• Cycas revoluta Critical Sago Cycad
• Cycas spp. Critical Sago Cycad, Cycas Family
• Cyclamen spp. Critical Sowbread, Ivy-Leaved Cyclamen
• Cymbopogon citratus Critical Lemon Grass
• Cymopterus spp. Mild Springparsleys, Alpine False Springparsley
• Cynoglossum amabile Severe Chinese Forget-Me-Not
• Cyperus alternifolius Critical Madagascar Umbrella Papyrus, Umbrella Papyrus
• Cypripedium acaule Critical Pink Lady's Slipper, White-Flowered Pink Lady's-Slipper
• Cypripedium spp. Critical Hardy Slipper Orchids, Pink Lady's Slipper
• Cytisus scoparius Critical Scotch Broom, Prostrate Broom

D

• Dahlia spp. Mild Dahlias, Garden Dahlia
• Daphne mezerum Moderate Mezereon, Daphne
• Daphne spp. Critical Daphnes, Mezereon
• Datura spp. Severe Devil's And Angel's Trumpets, Devil's Trumpets
• Datura stramonium Critical Jimsonweed, Purple Thorn-Apple
• Daucus carota Critical Wild Carrot, Domestic Carrot
• Delphinium spp. Critical Larkspurs, Larkspurs And Monkshoods
• Dianthus barbatus Critical Sweet-William, Brotero's Pink
• Dianthus spp. Mild Pinks, Carnations
• Dicentra canadensis Critical Squirrel Corn
• Dicentra cucullaria Critical Dutchman's Breeches
• Dichelostemma ida-maia Critical Firecracker Flower
• Dieffenbachia amoena Mild Dumb Canes
• Dieffenbachia picta Mild Tuftroot
• Dieffenbachia spp. Severe Dumb Canes, Tuftroot
• Digitalis purpurea Critical Purple Foxglove
• Dionaea muscipula Critical Venus Flytrap
• Dracaena deremensis Critical Cornstalk Dracaena
• Dracaena draco Critical Dragon-Tree
• Dracaena godseffiana Critical
• Dracaena marginata Severe Madagascar Dragon-Tree
• Dracaena sanderiana Critical Lucky Bamboo
• Dracaena spp. Moderate Agave And Allies, Dragon Trees
• Duranta erecta Critical Skyflower

E

• Echinacea Critical Coneflowers, Purple Coneflower
• Echinopsis multiplex Critical Easter Lily Cactus
• Echium plantagineum Severe Purple Viper's-Bugloss
• Echium vulgare Severe Viper's-Bugloss, Blue-Devil
• Enchylaena tomentosa Severe Barrier Saltbush
• Epilobium angustifolium Critical Fireweed
• Epilobium spp. Critical Willowherbs, Great Willowherb
• Epipremnum aureum Mild Golden Pothos, Marble Queen
• Equisetum arvense Severe Field Horsetail
• Equisetum spp. Critical Horsetails, Horsetails
• Erigeron speciosus Mild Aspen Fleabane
• Erysimum cheiranthoides Severe Wormseed Wallflower
• Erythrostemon gilliesii Mild Yellow Bird-Of-Paradise Shrub
• Eucalyptus obliqua Mild Brown-Top Stringybark
• Euonymus atropurpurea Moderate Wahoo
• Euonymus europaeus Critical Spindle
• Euonymus japonicus Critical Japanese Spindle Tree
• Euonymus occidentalis Moderate Western Burning Bush, Parish's Burning Bush
• Euonymus spp. Moderate Spindles, Winged Euonymus
• Eupatorium capillifolium Mild Dogfennel
• Euphorbia caput-medusae Critical Medusa's-Head
• Euphorbia marginata Critical Snow-On-The-Mountain
• Euphorbia milii Critical Crown-Of-Thorns
• Euphorbia nutans Critical Nodding Spurge
• Euphorbia pulcherrima Mild Poinsettia
• Euphorbia spp. Severe Spurges, Nances, Willows, And Allies
• Euphorbia tirucalli Critical Fire Stick, Pencil Cactus

F

• Fagopyrum spp. Mild Common Buckwheat, Tuber Fleeceflower
• Ficus benjamina Mild Weeping Fig
• Ficus cordata Critical Namaqua Fig, Namaqua Fig
• Ficus elastica Critical Rubber Plant
• Ficus lyrata Critical Fiddle-Leaf Fig
• Ficus microcarpa Critical Chinese Banyan, Malay Banyan
• Ficus spp. Mild Figs, Common Fig

G

• Galanthus nivalis Moderate Common Snowdrop, Queen Olga's Snowdrop
• Galanthus spp. Critical Snowdrops, Common Snowdrop
• Gardenia jasminoides Mild Common Gardenia, Fortune's Cape Jasmine
• Gelsemium sempervirens Critical Yellow Jessamine
• Gladiolus spp. Mild Irises And Allies, Gladioli
• Glechoma hederacea Critical Ground-Ivy
• Gloriosa superba Critical Flame Lily
• Gomphocarpus spp. Severe Balloonplant, Narrow-Leaf Cotton Bush
• Gutierrezia sarothrae Critical Broom Snakeweed
• Gypsophila elegans Mild Showy Baby's-Breath

H

• Halogeton glomeratus Critical Saltlover
• Halogeton sativus Critical Halogeton
• Haplopappus heterophyllus Severe Southern Goldenbush
• Hedera helix Moderate Common Ivy, English Ivy
• Hedera spp. Moderate Ivies, Common Ivy
• Helenium autumnale Critical Common Sneezeweed, Autumn Sneezeweed
• Heliotropium spp. Moderate Borage Family, Heliotropes
• Helleborus niger Moderate Christmas-Rose, Black Hellebore
• Helleborus spp. Critical Hellebores And Lenten Roses, Hellebores
• Hemerocallis spp. Critical Daylilies, Asphodels
• Heracleum maximum Mild Common Cowparsnip, Tube Clematis
• Heteromeles arbutifolia Critical Toyon, Island Toyon
• Hippeastrum spp. Moderate South American Amaryllis, Swamplilies
• Hippomane mancinella Critical Manchineel
• Hippophae rhamnoides Critical Sea-Buckthorn
• Homalanthus populifolius Critical Bleeding Heart
• Hosta plantaginea Mild Scented Hosta
• Humulus lupulus Critical Common Hops, Western Hop
• Hyacinthoides non-scripta Critical Bluebell, Spanish Bluebell
• Hyacinthus orientalis Moderate Hyacinth
• Hyacinthus spp. Critical Hyacinth Subfamily, Hyacinth Tribe
• Hydrangea arborescens Mild Wild Hydrangea, Hortensia
• Hydrangea spp. Critical Hydrangeas, Dogwoods, Hydrangeas, And Allies
• Hymenoxys odorata Critical Bitter Hymenoxys
• Hymenoxys spp. Critical Rubberweeds, Owlsclaws
• Hyoscyamus niger Moderate Black Henbane
• Hypericum perforatum Mild Common St. John's-Wort
• Hypericum spp. Critical St. John's Worts Tribe, St. John's Worts
• Hypochaeris radicata Severe Common Cat's-Ear

I

• Ilex aquifolium Mild European Holly
• Ilex cassine Critical Dahoon Holly
• Ilex glabra Critical Gallberry
• Ilex opaca Mild American Holly, Scrub Holly
• Ilex spp. Critical Hollies, American Holly
• Ilex vomitoria Critical Yaupon Holly, Chiapas Yaupon
• Impatiens balsamina Critical Garden Balsam
• Impatiens spp. Critical Touch-Me-Nots, Subgenus Impatiens
• Indigofera spp. Critical Indigos, Scarlet Pea
• Ipomoea alba Critical Moonflower
• Ipomoea batatas Critical Sweet Potato
• Ipomoea spp. Moderate Morning-Glories, Common Morning-Glory
• Iris spp. Mild Agaves, Orchids, Irises, And Allies, Irises
• Iris spuria Severe Blue Iris, Turkish Iris
• Isomeris arborea Critical Bladderpod

J

• Jasminum officinale Critical Common Jasmine
• Jasminum spp. Critical Jasmine, Pink Jasmine
• Jatropha curcas Critical Barbados Nut
• Jatropha podagrica Critical Gout Stalk
• Jatropha spp. Critical Physic Nuts, Peregrina
• Juglans nigra Severe Eastern Black Walnut
• Juglans spp. Critical Beeches, Oaks, Walnuts, And Allies, Walnuts
• Juniperus spp. Moderate Junipers, Eastern Redcedar

K

• Kalanchoe spp. Moderate Kalanchoes, Stonecrop Family
• Kalmia angustifolia Critical Sheep Laurel
• Kalmia latifolia Critical Mountain Laurel
• Kalmia polifolia Critical Swamp Laurel
• Kalmia spp. Moderate Mountain-Laurels, Mountain Laurel
• Karwinskia spp. Moderate Coyotillo, Mexican Fleabane

L

• Laburnum alpinum Critical Alpine Laburnum
• Laburnum anagyroides Critical Common Laburnum
• Laburnum spp. Critical Laburnum, Common Laburnum
• Lantana camara Critical Common Lantana, New Gold Lantana
• Lathyrus japonicus Critical Seaside Pea, Downy Beach Pea
• Lathyrus latifolius Critical Broad-Leaved Sweet Pea
• Lathyrus odoratus Moderate Sweet Pea
• Lathyrus vestitus Critical Pacific Pea, San Diego Pea
• Laurus nobilis Severe Bay Laurel
• Lavendula angustifolia Mild Common Lavender
• Leptandra virginica Critical Culver's Root
• Leucothoe spp. Critical Doghobble, Mountain Doghobble
• Levisticum officinale Mild Lovage
• Ligustrum japonicum Critical Wax-Leaf Ligustrum, Japanese Tree Lilac
• Ligustrum spp. Critical Privets, Chinese Privet
• Ligustrum vulgare Moderate Common Privet
• Lilium longiflorum Critical Easter Lily
• Lilium occidentale Critical Western Lily
• Lilium philadelphicum Critical Wood Lily
• Lilium speciosum Critical Showy Japanese Lily, Lilium rubrum
• Lilium spp. Critical True Lilies, Martagon Lily
• Lilium tigrinum Critical Tiger Lily
• Linum usitatissimum Severe Common Flax
• Lobelia cardinalis Moderate Cardinal Flower
• Lobelia inflata Critical Indian Tobacco
• Lobelia spp. Moderate Lobelias, Typical Lobelias
• Lonicera spp. Critical Honeysuckles, Japanese Honeysuckle
• Lophophora williamsii Moderate Peyote
• Lupinus spp. Severe Lupines, Brooms, Lupines, And Allies
• Lycopersicon spp. Mild Nightshades, Tomato
• Lyonia spp. Critical Lyonias, Fetterbush Lyonia
• Lysichiton americanus Critical Western Skunk Cabbage

M

• Macadamia integrifolia Severe Macadamia Tree, Nelmac II
• Maclura pomifera Critical Osage-Orange
• Malus spp. Moderate Apples, Apple
• Malus sylvestrus Severe Apple, European Wild Apple
• Mandragora spp. Critical Mandrakes, Mandrakes
• Manihot esculenta Critical Cassava
• Medicago lupulina Moderate Black Medick
• Melia azedarach Severe Chinaberry
• Menispermum canadense Moderate Moonseed
• Mentha pulegium Moderate Pennyroyal
• Mentha spp. Mild Mints, Balms, Mints, And Thymes
• Mercurialis perennis Critical Dog's Mercury
• Merremia tuberosa Critical Brazilian Jalap
• Mirabilis jalapa Moderate Marvel Of Peru, Four O'clock Plant
• Momordica charantia Moderate Bitter Melon
• Monstera deliciosa Mild Swiss Cheese Plant, Ceriman
• Monstera spp. Moderate Swiss Cheese Plant, Shingles Plant
• Myristica fragrans Critical Nutmeg

N

• Nandina domestica Critical Heavenly Bamboo
• Narcissus jonquilla Critical Jonquil, Daffodils
• Narcissus spp. Moderate Daffodils, Amaryllis, Onions, And Allies
• Nasturtium officinale Mild Watercress
• Nepeta cataria Moderate Catnip
• Nephthytis Critical
• Nerium oleander Critical Oleander
• Nicotiana glauca Critical Tree Tobacco
• Nicotiana obtusifolia Critical Desert Tobacco
• Nicotiana tabacum Severe Cultivated Tobacco
• Nicotiania spp. Moderate Tobaccos, Tree Tobacco
• Nolina microcarpa Critical Sacahuista
• Notholaena spp. Critical Star Cloak Fern, Coffee Fern

O

• Origanum majorana Mild Sweet Marjoram, Italian Oregano
• Origanum vulgare Mild Oregano, Greek Oregano
• Ornithogalum spp. Critical Star-Of-Bethlehem Tribe, Star-Of-Bethlehem
• Ornithogalum umbellatum Moderate Common Star-Of-Bethlehem
• Oxalis spp. Critical Woodsorrels, Palmate-Leaved Oxalis
• Oxytropis spp. Moderate Locoweed, Lambert's Locoweed

P

• Pachyrhizus erosus Critical Jicama
• Paeonia officinalis Mild Common Peony
• Paeonia spp. Critical Peonies, Common Peony
• Panicum capillare Critical Witch Grass
• Papaver spp. Moderate Buttercups, Poppies, And Allies, Poppies
• Parthenocissus quinquefolia Severe Virginia Creeper
• Parthenocissus tricuspidata Critical Japanese Creeper
• Pastinaca sativa Critical Wild Parsnip, Eastern Parsnip
• Peganum harmala Critical Harmel
• Pelargonium spp. Mild Geraniums And Storksbills, True Storksbills
• Pelargonium x hortorum Critical Garden Geranium
• Pellaea andromedifolia Critical Coffee Fern
• Perilla frutescens Critical Beefsteak Plant, Shiso
• Persea americana Severe Avocado
• Petroselinum crispum Mild Garden Parsley
• Phaseolus vulgaris Critical Common Bean, Pole Bean
• Philadelphus spp. Moderate Mock Oranges, Sweet Mock Orange
• Philodendron bipinnatifidum Critical Tree Philodendron
• Philodendron cordatum Critical
• Philodendron selloum Critical Tree Philodendron
• Philodendron spp. Mild Philodendrons, Red Princess
• Phoradendron flavescens Moderate American Mistletoe
• Phoradendron spp. Critical Leafy Mistletoes, American Mistletoe
• Phoradendron villosum Moderate Oak Mistletoe, Cory's Mistletoe
• Physalis alkekengi Critical Japanese-Lantern, Chinese Lantern Plant
• Phytolacca Americana Moderate American Pokeweed, Common American Pokeweed
• Pieris japonica Critical Japanese Andromeda
• Pinus ponderosa Severe Ponderosa Pine, Southwestern Ponderosa Pine
• Podocarpus macrophyllus Mild Kusamaki, Yew Plum Pine
• Podophyllum peltatum Severe Mayapple
• Polygonatum spp. Critical Solomon's Seals, Alternate-Leaved Solomon's Seals
• Polyscias guilfoylei Mild Lace Aralia
• Portulaca oleracea Critical Common Purslane, Pigweed
• Primula spp. Moderate Heathers, Balsams, Primroses, And Allies, Primroses
• Primula vulgaris Mild Primrose
• Prosopis spp. Critical Mesquites, Honey Mesquite
• Prunus laurocerasus Critical Cherry Laurel
• Prunus persica Critical Peach, Nectarine
• Prunus serotina Critical Black Cherry, Escarpment Black Cherry
• Prunus spp. Severe Plums, Cherries, And Allies, Black Cherry
• Pteridium aquilinum Moderate Common Bracken, Eagle Fern
• Pyracantha spp. Critical Firethorns, Firethorn
• Pyrus communis Critical Common Pear, Wild Pear
• Pyrus spp. Moderate Pears, Callery Pear

Q

• Quercus spp. Moderate Oaks, High-Latitude Oaks

R

• Radermachera sinica Critical Emerald Tree
• Ranunculus spp. Moderate Buttercups, Poppies, And Allies, Buttercups
• Raphanus raphanistrum Severe Jointed Charlock, Wild Radish
• Rheum rhabarbarium Critical Rhubarb
• Rhododendron spp. Critical Rhododendrons And Azaleas, Bog Labrador Tea
• Ricinus communis Critical Castor Bean
• Robinia pseudoacacia Critical Black Locust
• Robinia spp. Severe Locust Trees, Black Locust
• Rumex spp. Critical Docks, Curled Dock
• Russelia equisetiformis Critical Firecracker Plant

S

• Salvia officinalis Moderate Garden Sage
• Salvia spp. Critical Sages, Melissas And Sages
• Sambucus mexicana Moderate Blue Elder, Elder
• Sambucus spp. Critical Elders, Red-Berried Elder
• Sanguinaria canadensis Critical Bloodroot
• Sansevieria trifasciata Mild Snake Plant
• Sarcobatus vermiculatus Critical Greasewood, Bailey's Greasewood
• Schefflera actinophylla Critical Australian Umbrella Tree
• Schefflera spp. Mild Umbrella Trees, Patē
• Schinus spp. Severe Peppertrees, Brazilian Pepper
• Scilla spp. Critical Squills, Hyacinth Subfamily
• Scindapsus aureus Mild Golden Pothos
• Scindapsus pictus Mild Satin Pothos
• Scrophularia spp. Critical Mints, Plantains, Olives, And Allies, Figworts
• Senecio mikanioides Critical Cape-Ivy
• Senecio spp. Critical Groundsels, Groundsels And Allies
• Senecio vulgaris Critical Common Groundsel
• Senna occidentalis Severe Coffee Senna
• Senna spp. Critical Sennas, Candelabra Bush
• Sesbania punicea Critical Scarlet Sesbane
• Sesbania spp. Critical Riverhemps, Bigpod Sesbania
• Simmondsia chinensis Critical Jojoba
• Solanum carolinense Moderate Carolina Horsenettle
• Solanum dulcamara Severe Bittersweet Nightshade, Climbing Nightshade
• Solanum linnaeanum Critical Devil's-Apple
• Solanum melongena Moderate Eggplant, Wild Eggplant
• Solanum nigrum Severe Black Nightshade Complex, Black Nightshade
• Solanum pseudocapsicum Severe Jerusalem Cherry
• Solanum spp. Severe Nightshades, Nightshades, Bindweeds, Gooseweeds, And Allies
• Solanum tuberosum Moderate Potato
• Solidago spp. Critical Goldenrods, Solidago Sect. Solidago
• Sophora secundiflora Critical Texas Mountain Laurel
• Sorghum bicolor Critical Sorghum, Broom-Corn
• Sorghum halepense Critical Johnson Grass, Columbus Grass
• Sorghum spp. Critical Johnsongrasses, Milos, Sudangrasses, And Allies, Johnson Grass
• Sorghum sudanense Critical Sudan Grass
• Spathiphyllum spp. Mild Peace Lily, Spathe Flower
• Sphenosciadium capitellatum Mild Ranger Buttons
• Strelitzia reginae Moderate Common Bird-Of-Paradise Flower, Crane Flower
• Symphoricarpos albus Moderate Common Snowberry, Garden Snowberry
• Symphytum Critical Comfrey, Common Comfrey
• Symphytum x uplandicum Critical Russian Comfrey
• Symplocarpus foetidus Mild Eastern Skunk Cabbage, Japanese Skunk Cabbage
• Syngonium podophyllum Mild Goosefoot-Plant, Fivefingers

T

• Tanacetum vulgare Critical Tansy
• Taxus cuspidata Critical Japanese Yew
• Taxus spp. Critical Yews, Common Yew
• Thevetia peruviana Mild Be-Still Tree
• Thymophylla spp. Critical Pricklyleaves, Parralena
• Toxicodendron pubescens Critical Atlantic Poison Oak, Rhus toxicodendron
• Toxicodendron radicans Moderate Eastern Poison Ivy, Western Poison Ivy
• Toxicodendron vernix Critical Poison Sumac, Varnish Tree
• Tradescantia fluminensis Severe Small-Leaf Spiderwort
• Tradescantia virginiana Mild Virginia Spiderwort
• Trichostema lanatum Critical Woolly Bluecurls
• Trifolium hybridum Critical Alsike Clover
• Trifolium pratense Critical Red Clover
• Trifolium repens Moderate White Clover, Giant Clover
• Triglochin maritima Critical Common Arrowgrass
• Tulip spp. Mild Lilies, Hibiscuses
• Tulipa spp. Critical Lilies, Tulips
• Tullidora spp. Critical Coyotillo

V

• Veratrum spp. Critical False Hellebores, Green False Hellebore
• Veratrum viride Critical Green False Hellebore, Western Green False Hellebore
• Vicia sativa Severe Common Vetch, Narrow-Leaved Vetch
• Vicia spp. Moderate Vetches, Tufted Vetch
• Victoria amazonica Critical Amazon Giant Waterlily
• Vinca rosea Critical Madagascar Periwinkle, Periwinkle
• Vinca spp. Critical Periwinkles, Lesser Periwinkle
• Viola spp. Critical Violets, Pansies And Violets

W

• Wisteria spp. Mild Wisterias, Chinese Wisteria

X

• Xanthium strumarium Critical Rough Cocklebur, Italian Cocklebur
• Xanthosma spp. Severe Spiny Goldenweed, Sleepy Daisy
• Xerophyllum tenax Critical Common Beargrass

Y

• Yucca spp. Mild Yuccas, Joshua Tree

Z

• Zamia furfuracea Critical Cardboard Cycad
• Zamia integrifolia Critical Coontie
• Zamia spp. Severe Coontie, Cardboard Cycad
• Zantedeschia aethiopica Mild Calla Lily
• Zea mays Critical Maize, Sweet Corns
• Zigadenus spp. Critical Common Star Lily, Mountain Deathcamas
• Zigadenus venenosus Moderate Meadow Deathcamas, Grassy Meadow Deathcamas