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Abrus precatorius Critical Precatory Bean, Rosary Pea Absinthe Wormwood Moderate Artemisia spp. Acer rubrum Critical Red Maple, Carolina Red Maple Achillea millefolium Moderate Common Yarrow Complex, Common Yarrow Aconite-Leaved Buttercup Severe Aconitum spp. Aconitum spp. Severe Monkshoods, Baneberries, Cohoshes, and Winter Aconites Actaea rubra Mild Red Baneberry, White-Fruited Red Baneberry Adenium obesum Severe Desert Rose, Impala Lily Aesculus hippocastanum Severe Horse-Chestnut Aesculus spp. Severe Buckeyes, Horse-Chestnut African Asparagus Moderate Asparagus spp. African Box Critical Buxus spp. African Cyclamen Critical Cyclamen spp. African Desert Banana Mild Strelitzia reginae African Potato Critical Hemerocallis spp. African Tulip Tree Severe Tulipa spp. Agave and Allies Severe Dracaena spp. Agave and Allies Moderate Asparagus spp. Agaves, Orchids, Irises, and Allies Mild Iris spp. Agaves, Orchids, Irises, and Allies Moderate Asparagus spp. Ageratina altissima Critical White Snakeroot, White Snakeroot Aglaonema modestum Mild Chinese Evergreen Air Plant Moderate Kalanchoe spp. Alabama Cherry Severe Prunus serotina Alcove Deathcamas Severe Zigadenus spp. Algerian Ivy Moderate Hedera spp. Algerian Oregano Mild Origanum vulgare Alkali Heliotrope Severe Heliotropium spp. Alkali Mallow Moderate Hedera spp. Alligator Plant Moderate Kalanchoe spp. Allium ampeloprasum Critical Wild Leek Complex, Wild Leek Allium cepa Critical Common Onion, Shallot Allium sativum Critical Garlic, Serpent Garlic Allium schoenoprasum Critical Chives, Wild Chives Almond Critical Prunus spp. Alocasia spp. Mild Elephant's-Ears, Asian Taro Aloe barbadensis Mild Aloe vera Aloe vera Mild Aloe Vera, Chinese Aloe Aloe Yucca Critical Yucca spp. Aloysia triphylla Moderate Lemon Verbena Alpine Azalea Critical Kalmia spp. Alpine Clematis Mild Clematis spp. Alpine Cyclamen Critical Cyclamen spp. Alpine False Springparsley Mild Cymopterus spp. Alpine Kelleria Mild Dieffenbachia spp. Alpine Laburnum Severe Laburnum spp. Alpine Larkspur Critical Delphinium spp. Alpine Milkvetch Severe Astragalus spp. Alpine Ragwort Critical Senecio spp. Alpine Ragwort Complex Critical Senecio spp. Alpine Shooting Star Mild Primula spp. Alpine Yarrow Moderate Achillea millefolium Alsike Clover Critical Trifolium hybridum Amaranths Severe Amaranthus spp. Amaranthus spp. Severe Pinks, Cactuses, and Allies, Amaranths Amaryllis Moderate Amaryllis spp. Amaryllis spp. Moderate Amaryllis, Onions, and Allies, Amaryllis Amaryllis, Onions, and Allies Moderate Amaryllis spp. Amaryllis, Onions, and Allies Severe Narcissus spp. Amazonian Taro Mild Alocasia spp. American Bittersweet Severe Celastrus scandens American Bittersweet Moderate Euonymus spp. American Black Nightshade Critical Solanum spp. American Brunfelsia Severe Brunfelsia spp. American Cornmint Mild Mentha spp. American Holly Mild Ilex opaca American Holly Mild Ilex spp. American Lily-Of-The-Valley Severe Convallaria majalis American Lovage Critical Ligustrum spp. American Mistletoe Moderate Phoradendron flavescens American Mistletoe Moderate Phoradendron spp. American Morning Glory Moderate Ipomoea spp. American Plum Critical Prunus spp. American Vetch Critical Vicia spp. American Water-Willow Mild Dianthus spp. American Wisteria Mild Wisteria spp. American Yellowrocket Moderate Barbarea orthoceras Ammi majus Mild Bullwort, False Queen Anne's Lace Amsinckia spp. Critical Fiddlenecks, Common Fiddleneck Amur Day-Lily Critical Hemerocallis spp. Amur Honeysuckle Mild Clematis spp. Anatolian Cyclamen Critical Cyclamen spp. Andean Horsetail Critical Equisetum spp. Andean Walnut Severe Juglans spp. Anemones, Buttercups, Larkspurs and Allies Severe Ranunculus spp. Angel's Trumpet Severe Datura spp. Angel's-Tears Severe Narcissus spp. Antelopehorn Milkweed Critical Asclepias spp. Antelopehorns Critical Asclepias spp. Anthemis cotula Moderate Stinking Chamomile Anthemis nobilis Moderate Chamomile Anthurium scherzerianum Mild Flamingo Flower Anti-Febrile Dichroa (Chinese Quinine) Moderate Hydrangea spp. Apocynum cannabinum Moderate Hemp Dogbane Apocynum spp. Moderate Dogbane Family, Dogbanes Appalachian White Snakeroot Critical Ageratina altissima Apple Severe Malus spp. Apple Severe Malus sylvestrus Apple Mint Mild Mentha spp. Apples Severe Malus spp. Apricot Critical Prunus spp. Apricot Angel's Trumpet Severe Datura spp. April-Fool Parasol Moderate Amaryllis spp. Aquatic Milkweed Critical Asclepias spp. Arabian Dragon Tree Severe Dracaena spp. Aralia spinosa Mild Devil's Walkingstick Arctic Locoweed Critical Oxytropis spp. Arctic Lupine Critical Lupinus spp. Arisaema triphyllum Mild Jack-In-The-Pulpit, Common Jack-In-The-Pulpit Arizona Black Walnut Severe Juglans spp. Arizona Lupine Critical Lupinus spp. Arkansas Yucca Critical Yucca spp. Armstrong's Sago Critical Cycas spp. Arrowhead Rattlebox Severe Crotalaria spp. Arrowleaf Senecio Critical Senecio spp. Arroyo Lupine Critical Lupinus spp. Artemisia dracunculus Mild Tarragon Artemisia spp. Moderate 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 Ashy Hydrangea Moderate Hydrangea spp. Asian Lily-Of-The-Valley Severe Convallaria majalis Asian Taro Mild Alocasia spp. Asparagus Moderate Asparagus spp. Asparagus densiflorus Moderate Sprenger's Asparagus, Emerald Feather Asparagus spp. Moderate Agaves, Orchids, Irises, and Allies, Agave and Allies Asparagus Subfamily Moderate Asparagus spp. Aspen Fleabane Moderate Erigeron speciosus Asphodels Critical Hemerocallis spp. Asthma Plant Moderate Euphorbia spp. Astragalus spp. Severe Milkvetches, Wild Liquorice Atamasco Lily Moderate Amaryllis spp. Atlantic Camas Moderate Hyacinthus spp. Atlantic Ivy Moderate Hedera helix Atlantic Ivy Moderate Hedera spp. Austral Bracken Severe Pteridium aquilinum Austral Stork's-Bill Moderate Pelargonium spp. Australian Clematis Mild Clematis spp. Australian Umbrella Tree Mild Brassaia actinophylla Australian Umbrella Tree Mild Schefflera spp. Australian Umbrella Tree Moderate Brassica spp. Australian Umbrella Tree Mild Schefflera actinophylla Autumn Clematis Mild Clematis spp. Autumn Crocus Critical Colchicum autumnale Autumn Crocus Complex Critical Colchicum autumnale Autumn Narcissus Severe Narcissus spp. Autumn Pypie Mild Gladiolus spp. Autumn Sneezeweed Moderate Helenium autumnale Avocado Critical Persea americana Azores Ivy Moderate Hedera spp.
Babington's Leek Critical Allium ampeloprasum Baikal Monkshood Severe Aconitum spp. Bajada Lupine Critical Lupinus spp. Baker's Alpineparsley Mild Cymopterus spp. Balearic Box Critical Buxus spp. Balearic Sowbread Critical Cyclamen spp. Balloon Milkvetch Severe Astragalus spp. Balms, Mints, and Thymes Mild Mentha spp. Balsam Moderate Clusia major Banana Yucca Critical Yucca spp. Baneberries, Cohoshes, and Winter Aconites Severe Aconitum spp. Barbados Lily Moderate Amaryllis spp. Barbados Lily Severe Hippeastrum spp. Barbarea orthoceras Moderate American Yellowrocket Barestem Larkspur Critical Delphinium spp. Bay Laurel Severe Laurus nobilis Bay Lobelia Moderate Lobelia spp. Be-Still Tree Mild Thevetia peruviana Beach Morning Glory Moderate Ipomoea spp. Beach Plum Critical Prunus spp. Beach Sheoak Critical Equisetum spp. Beach Wormwood Moderate Artemisia spp. Beaked Radish Moderate Raphanus raphanistrum Beaked Yucca Critical Yucca spp. Bear's Ear Mild Primula spp. Bear's-Ear Sanicle Mild Primula spp. Bearded Begonia Severe Begonia spp. Bearded Iris Mild Iris spp. Bechtel's Crab Apple Severe Malus spp. Bedding Begonia Severe Begonia spp. Bedding Begonia Severe Begonia semperflorens Bedding Dahlia Moderate Dahlia spp. Beeches, Oaks, Walnuts, and Allies Severe Juglans spp. Beefsteak Begonia Severe Begonia spp. Beefsteak Plant Moderate Perilla frutescens Begonia semperflorens Severe Wax Begonia, Bedding Begonia Begonia spp. Severe Begonias, Bougainvilleas Begonias Severe Begonia spp. Begonias and Allies Severe Begonia spp. Belladonna Lily Moderate Amaryllis spp. Bellflower Family Moderate Lobelia spp. Benediction Lily Severe Clivia spp. Bent-Flowered Fiddleneck Critical Amsinckia spp. Bermuda Buttercup Critical Oxalis spp. Berteroa incana Critical Hoary Alyssum Biennial Wormwood Moderate Artemisia spp. Bietou Mild Chrysanthemum spp. Bietous Mild Chrysanthemum spp. Big Leaf Mistletoe Moderate Phoradendron spp. Big Sagebrush Moderate Artemisia spp. Bigflower Raintree Severe Brunfelsia spp. Bigfruit Raintree Severe Brunfelsia spp. Bigroot Springparsley Mild Cymopterus spp. Bird Cherry Critical Prunus spp. Bird Flower Severe Crotalaria spp. Bird Flower Severe Laburnum spp. Bird's-Beaks Moderate Cordyline spp. Bird's-Eye Primrose Mild Primula spp. Bird's-Nest Orchid Moderate Helleborus spp. Birdflower Severe Crotalaria spp. Bitter Cherry Critical Prunus spp. Bittersweet Nightshade Critical Solanum spp. Bittersweet Nightshade Mild Solanum dulcamara Black Beauty Cestrum Severe Cestrum spp. Black Cherry Critical Prunus spp. Black Cherry Severe Prunus serotina Black Hellebore Moderate Helleborus niger Black Henbane Severe Hyoscyamus niger Black Locust Severe Robinia pseudoacacia Black Locust Severe Robinia spp. Black Mustard Moderate Brassica spp. Black Nightshade Critical Solanum spp. Black Nightshade Critical Solanum nigrum Black Nightshade Complex Critical Solanum spp. Black Nightshade Complex Critical Solanum nigrum Black Oak Critical Quercus spp. Black Sudan Grass Critical Sorghum bicolor Black Sudan Grass Critical Sorghum spp. Black Velvet Alocasia Mild Alocasia spp. Black Wild Sorghum Critical Sorghum spp. Blackberry Lily Mild Iris spp. Blackish Locoweed Critical Oxytropis spp. Blackjack Oak Critical Quercus spp. Blackthorn Critical Prunus spp. Bladder-Dock Critical Rumex spp. Blue Afrikaner Mild Gladiolus spp. Blue Dicks Moderate Hyacinthus spp. Blue Holly Mild Ilex spp. Blue Iris Mild Iris spuria Blue Ladieshand Moderate Hyacinthus spp. Blue Lily Severe Clivia spp. Blue Pypie Mild Gladiolus spp. Blue Rattlepod Severe Crotalaria spp. Blue-Devil Critical Echium vulgare Bluebell Moderate Hyacinthus spp. Bluebells Moderate Hyacinthus spp. Bluebush Pea Severe Crotalaria spp. Bluewitch Nightshade Critical Solanum spp. Blushing Philodendron Mild Philodendron spp. Bog Labrador Tea Critical Rhododendron spp. Bog St. John's-Wort Mild Hypericum spp. Bokkeveld Tree Crassula Mild Crassula arborescens Bolander's Water-Hemlock Critical Cicuta spp. Bolander's Water-Hemlock Critical Cicuta maculata Bollean Mistletoe Moderate Phoradendron spp. Boneseed Daisies Mild Chrysanthemum spp. Bonneville Shooting Star Mild Primula spp. Borage Mild Borago officinalis Borage Family Severe Heliotropium spp. Borago officinalis Mild Borage Border Privet Critical Ligustrum spp. Boreal Locoweed Critical Oxytropis spp. Bottlebrush Asparagus Moderate Asparagus spp. Bottlebrush Buckeye Severe Aesculus spp. Bougainvilleas Severe Begonia spp. Bowltube Iris Mild Iris spp. Boxes Critical Buxus spp. Boxleaf Honeysuckle Critical Ligustrum spp. Bractless Lobelias Moderate Lobelia spp. Branched Horsetail Critical Equisetum spp. Branched Monkshood Severe Aconitum spp. Branched Pencil Cholla Moderate Euphorbia tirucalli Brassaia actinophylla Mild Australian Umbrella Tree Brassica kaber Moderate Charlock Mustard Brassica spp. Moderate Mustards, Capers, and Allies, Mustard Family Braun's Giant Horsetail Critical Equisetum spp. Brazil Raintree Severe Brunfelsia spp. Breede River Yellowwood Critical Taxus spp. Brilliant Raintree Severe Brunfelsia spp. Bristly Bird's Beak Moderate Cordyline spp. Bristly Buttercup Severe Ranunculus spp. Bristly Fiddleneck Critical Amsinckia spp. Bristly Locust Severe Robinia spp. Broad Beech Fern Critical Cicuta spp. Broad Leaved Palm Lily Moderate Cordyline spp. Broad-Leafed Helleborine Moderate Helleborus spp. Broad-Leaved Dock Critical Rumex spp. Broad-Leaved Sweet Pea Critical Lathyrus latifolius Broadleaf Lupine Critical Lupinus spp. Broadleaf Milkweed Critical Asclepias spp. Broadleaf Mistletoe Moderate Phoradendron spp. Broadleaf Wild Leek Critical Allium ampeloprasum Broccoli Moderate Brassica spp. Broom Reed Critical Equisetum spp. Broom-Corn Critical Sorghum bicolor Broom-Corn Critical Sorghum spp. Brooms, Lupines, and Allies Critical Lupinus spp. Brotero's Pink Mild Dianthus spp. Brotero's Pink Mild Dianthus barbatus Brown Mustard Moderate Brassica spp. Brown-Spined Pricklypear Severe Tulipa spp. Brown-Top Stringybark Mild Eucalyptus obliqua Brunfelsia spp. Severe Raintrees, Brazil Raintree Buckeyes Severe Aesculus spp. Buckley's Yucca Critical Yucca spp. Buddha's Hand Taro Mild Alocasia spp. Buffalo-Bur Critical Solanum spp. Bugweed Critical Solanum spp. Bulblet-Bearing Water Hemlock Critical Cicuta spp. Bulbous Buttercup Severe Ranunculus spp. Bull Tacky Mild Crassula arborescens Bullwort Mild Ammi majus Bullwort Critical Cicuta spp. Bunch-Flowered Daffodil Severe Narcissus spp. Bungaruau Mild Schefflera spp. Bur Oak Critical Quercus spp. Burchells Asparagus Moderate Asparagus spp. Bush Asparagus Moderate Asparagus spp. Bush Lilies Severe Clivia spp. Bush Lily Severe Clivia spp. Bush Lupine Complex Critical Lupinus spp. Bush Morning Glory Moderate Ipomoea spp. Bush Nightfighter Severe Dracaena spp. Bush Vetch Critical Vicia spp. Buttercup Family Mild Clematis spp. Buttercup Family Severe Ranunculus spp. Buttercups Severe Ranunculus spp. Buttercups, Poppies, and Allies Severe Ranunculus spp. Butterfly Amaryllis Severe Hippeastrum spp. Butterfly Milkweed Critical Asclepias spp. Butterfly Milkweed Critical Asclepias tuberosa Butterfly Storksbill Moderate Pelargonium spp. Butterflyweed Critical Asclepias tuberosa Butternut Severe Juglans spp. Butterweed Critical Senecio spp. Buxus spp. Critical Boxes, Common Box
Cabbage Moderate Brassica spp. Cabbage Trees and Allies Moderate Cordyline spp. Cabbage, Broccoli, and Allies Moderate Brassica spp. Cabbage, Broccoli, and Allies Complex Moderate Brassica spp. Cabbages and Mustards Moderate Brassica spp. Caesalpinia pulcherrima Mild Peacock Flower Caladium Mild Caladium spp. Caladium spp. Mild Caladium, Heart of Jesus Calamansi Severe Citrus mitis Calamondin Severe Citrus mitis California Black Oak Critical Quercus spp. California Buckeye Severe Aesculus spp. California Buttercup Severe Ranunculus spp. California Larkspur Critical Delphinium spp. California Mugwort Moderate Artemisia spp. California Sagebrush Moderate Artemisia spp. California Yarrow Moderate Achillea millefolium Calla Lily Mild Zantedeschia aethiopica Calpurnia Severe Laburnum spp. Cambodian Dragon Tree Severe Dracaena spp. Camphor Storksbill Moderate Pelargonium spp. Canada Hawkweed Critical Kalmia spp. Canada Lily Critical Lilium spp. Canada Plum Critical Prunus spp. Canadian Milkvetch Severe Astragalus spp. Canadian Yew Critical Taxus spp. Canaigre Dock Critical Rumex spp. Canary Bird Bush Severe Crotalaria spp. Canary Islands Ivy Moderate Hedera helix Canary Islands Ivy Moderate Hedera spp. Canby's Wild Lovage Critical Ligustrum spp. Candlewood Cestrum Severe Cestrum spp. Cannabis Critical Cannabis sativa Cannabis sativa Critical Cannabis, Ruderalis Marijuana Cape Cowslips Moderate Hyacinthus spp. Cape Fig Mild Ficus spp. Cape Holly Mild Ilex spp. Cape Mint Mild Mentha spp. Cape Rattlepod Severe Crotalaria spp. Cape Smilax Moderate Asparagus spp. Cape Tulips Mild Iris spp. Cape Tulips Severe Tulipa spp. Cape-Ivy Severe Senecio mikanioides Caper Spurge Moderate Euphorbia spp. Caracas Rattlebox Severe Crotalaria spp. Caraway Mild Carum carvi Cardboard Cycad Critical Zamia furfuracea Cardboard Cycad Critical Zamia spp. Cardinal Flower Moderate Lobelia cardinalis Cardinal Flower Moderate Lobelia spp. Carnations Mild Dianthus spp. Carolina Holly Mild Ilex spp. Carolina Horsenettle Critical Solanum carolinense Carolina Horsenettle Critical Solanum spp. Carolina Laurelcherry Critical Prunus spp. Carolina Lily Critical Lilium spp. Carolina Red Maple Critical Acer rubrum Carolina Vetch Critical Vicia spp. Carolina Wicky Critical Kalmia spp. Carrizo Fiddleneck Critical Amsinckia spp. Carthusian Pink Mild Dianthus spp. Carum carvi Mild Caraway Castor Bean Critical Ricinus communis Catalina Cherry Critical Lyonia spp. Catawba Rhododendron Critical Rhododendron spp. Caterpillar Phacelia Critical Cicuta spp. Caterpillar Scorpionweed Critical Cicuta spp. Catnip Moderate Nepeta cataria Catthorn Asparagus Moderate Asparagus spp. Caucasian Wingnut Severe Juglans spp. Caucasus Apple Severe Malus spp. Cauliflower Moderate Brassica spp. Celastrus scandens Severe American Bittersweet Celery Leaf Lovage Critical Ligustrum spp. Centaurea repens Severe Russian Knapweed Centaurea solstitialis Severe Yellow Star-Thistle Centipede Tongavine Mild Monstera spp. Ceriman Mild Monstera deliciosa Cestrum spp. Severe Cestrums, Night Jessamine Cestrums Severe Cestrum spp. Cestrums and Allies Severe Cestrum spp. Chamisso Bush Lupine Critical Lupinus spp. Chamomile Moderate Anthemis nobilis Chamomiles, Yarrows, and Allies Mild Chrysanthemum spp. Chaparral Yucca Critical Yucca spp. Charlock Mustard Moderate Brassica kaber Charlock Mustard Moderate Brassica spp. Charming Clematis Mild Clematis spp. Chatham Islands Hybrid Hebe Mild Dieffenbachia spp. Chenopodium ambrosioides Critical Mexican Tea, Wormseed Chenopodium botrys Critical Jerusalem Oak, Low Goosefoot Cherry Crab Severe Malus spp. Cherry Laurel Critical Prunus spp. Cherry Laurel Severe Prunus laurocerasus Cherry Tomato Moderate Lycopersicon spp. Cherry-Pie Severe Heliotropium spp. Cherry-Plum Critical Prunus spp. Chestnut Oak Critical Quercus spp. Chick Lupine Critical Lupinus spp. Chickasaw Plum Critical Prunus spp. Chickpea Milkvetch Severe Astragalus spp. Chiggery Grapes Severe Heliotropium spp. Chilean Jessamine Severe Cestrum spp. Chilean Potato Vine Critical Ligustrum spp. Chinaberry Critical Melia azedarach Chinese Aloe Mild Aloe vera Chinese Banyan Mild Ficus spp. Chinese Banyan Critical Ficus microcarpa Chinese Boxwood Critical Buxus spp. Chinese Buttercup Severe Ranunculus spp. Chinese Euonymus Moderate Euonymus spp. Chinese Evergreen Mild Aglaonema modestum Chinese Flowering Crabapple Severe Malus spp. Chinese Forget-Me-Not Severe Cynoglossum amabile Chinese Hibiscus Severe Tulipa spp. Chinese Holly Mild Ilex spp. Chinese Horse-Chestnut Severe Aesculus spp. Chinese Hydrangea Moderate Hydrangea spp. Chinese Lantern Plant Severe Physalis alkekengi Chinese Mugwort Moderate Artemisia spp. Chinese Privet Critical Ligustrum spp. Chinese Walnut Severe Juglans spp. Chinese Wisteria Mild Wisteria spp. Chinese Yew Critical Taxus spp. Chinese-Pink Mild Dianthus spp. Chinkapin Oak Critical Quercus spp. Chiricaspi Raintree Severe Brunfelsia spp. Chives Critical Allium schoenoprasum Chokecherry Critical Prunus spp. Christmas Cherry Critical Solanum spp. Christmas Cholla Moderate Euphorbia tirucalli Christmas-Rose Moderate Helleborus niger Christmas-Rose Moderate Helleborus spp. Chrysanthemum spp. Mild Chamomiles, Yarrows, and Allies, Chrysanthemums Chrysanthemums Mild Chrysanthemum spp. Cicuta maculata Critical Water Hemlock, Common Water-Hemlock Cicuta spp. Critical Water Hemlocks, Water Hemlock Citron Day-Lily Critical Hemerocallis spp. Citrus Mild Citrus paradisi Citrus aurantifolia Mild Key Lime Citrus Aurantium Mild Orange, Key Lime Citrus limonia Severe Lemon, Rangpur Citrus mitis Severe Kumquat, Calamondin Citrus paradisi Mild Orange, Citrus Citrus sinensis Mild Orange Clammy Locust Severe Robinia spp. Clasping Milkweed Critical Asclepias spp. Clematis and Leatherflowers Mild Clematis spp. Clematis spp. Mild Clematis and Leatherflowers, Buttercup Family Cleveland's Shooting Star Mild Primula spp. Climbing Asparagus Moderate Asparagus spp. Climbing Dock Critical Rumex spp. Climbing Fig Mild Ficus spp. Climbing Hydrangea Moderate Hydrangea spp. Climbing Nightshade Mild Solanum dulcamara Climbing Sorrel Severe Begonia spp. Clivia spp. Severe Bush Lilies, Natal Lily Clove Pink Mild Dianthus spp. Clusia major Moderate Balsam, Wild Balsam Cluster Fig Mild Ficus spp. Clustered Dock Critical Rumex spp. Clusterleaf Asparagus Moderate Asparagus spp. Coarse Myrrhleaf Storksbill Moderate Pelargonium spp. Coast Lily Critical Lilium spp. Coast Live Oak Critical Quercus spp. Coast Yarrow Moderate Achillea millefolium Coastal Burnweed Critical Senecio spp. Coastal Bush Lupine Critical Lupinus spp. Coastal Plain Rattlebox Severe Crotalaria spp. Coastal Plain Staggerbush Critical Lyonia spp. Coconut Geranium Moderate Pelargonium spp. Colchicum autumnale Critical Autumn Crocus Complex, Autumn Crocus Coleus amboinicus Moderate Indian Borage Collared Annual Lupine Critical Lupinus spp. Colocasia esculenta Mild Taro Colocasia spp. Mild Elephant Ears, Taro Columbia Lily Critical Lilium spp. Columbian Larkspur Critical Delphinium spp. Columbian Monkshood Severe Aconitum spp. Columbus Grass Critical Sorghum bicolor Columbus Grass Severe Sorghum halepense Columbus Grass Critical Sorghum spp. Common Asparagus Fern Moderate Asparagus spp. Common Bird-Of-Paradise Flower Mild Strelitzia reginae Common Box Critical Buxus spp. Common Bracken Severe Pteridium aquilinum Common Buckwheat Mild Fagopyrum spp. Common Cat's-Ear Mild Hypochaeris radicata Common Chrysanthemum Mild Chrysanthemum spp. Common Cowparsnip Mild Heracleum maximum Common Derris Severe Robinia spp. Common Eucrypta Mild Chrysanthemum spp. Common Fiddleneck Critical Amsinckia spp. Common Fig Mild Ficus spp. Common Gardenia Mild Gardenia jasminoides Common Grape Hyacinth Moderate Hyacinthus spp. Common Groundsel Critical Senecio spp. Common Groundsel Severe Senecio vulgaris Common Hibiscus Severe Tulipa spp. Common Hops Critical Humulus lupulus Common Ivy Moderate Hedera helix Common Ivy Moderate Hedera spp. Common Jack-In-The-Pulpit Mild Arisaema triphyllum Common Laburnum Severe Laburnum spp. Common Lantana Critical Lantana camara Common Lavender Moderate Lavendula angustifolia Common Milkweed Critical Asclepias spp. Common Morning-Glory Moderate Ipomoea spp. Common Mugwort Moderate Artemisia spp. Common Onion Critical Allium cepa Common Peony Mild Paeonia officinalis Common Pratia Moderate Lobelia spp. Common Privet Moderate Ligustrum vulgare Common Privet Critical Ligustrum spp. Common Purslane Critical Portulaca oleracea Common Ragweed Moderate Artemisia spp. Common Red-Stem Fig Mild Ficus spp. Common Rhododendron Critical Rhododendron spp. Common Sneezeweed Moderate Helenium autumnale Common Sorrel Critical Rumex spp. Common St. John's-Wort Mild Hypericum perforatum Common St. John's-Wort Mild Hypericum spp. Common Star Lily Severe Zigadenus spp. Common Stork's-Bill Critical Cicuta spp. Common String-Of-Stars Severe Heliotropium spp. Common Sunshine Conebush Severe Tulipa spp. Common Swordlily Mild Gladiolus spp. Common Twayblade Moderate Helleborus spp. Common Vetch Critical Vicia spp. Common Water Hyacinth Moderate Hyacinthus spp. Common Water-Crowfoot Severe Ranunculus spp. Common Water-Hemlock Critical Cicuta spp. Common Water-Hemlock Critical Cicuta maculata Common Yarrow Moderate Achillea millefolium Common Yarrow Complex Moderate Achillea millefolium Common Yellow-Stem Fig Mild Ficus spp. Common Yew Mild Iris spp. Common Yew Critical Taxus spp. Common Yucca Critical Yucca spp. Compact Dock Critical Rumex spp. Conium maculatum Critical Poison Hemlock Convallaria majalis Severe European Lily of the Valley, American Lily-Of-The-Valley Coontie Critical Zamia integrifolia Coontie Critical Zamia spp. Coral Lily Critical Lilium spp. Coral Pea Critical Abrus precatorius Cordyline australis Moderate New Zealand Cabbage Tree Cordyline spp. Moderate Cabbage Trees and Allies, Ti Cordyline terminalis Moderate Ti Corianderleaf Storksbill Moderate Pelargonium spp. Corn Lily Moderate Helleborus spp. Corn Marigold Mild Chrysanthemum spp. Corn Mint Mild Mentha spp. Cornstalk Dracaena Severe Dracaena spp. Cornstalk Dracaena Severe Dracaena deremensis Corrugated Wavewing Mild Cymopterus spp. Corsican Hellebore Moderate Helleborus spp. Cory's Mistletoe Moderate Phoradendron spp. Cotton Burnweed Critical Senecio spp. Coulter's Lupine Critical Lupinus spp. Cowbane Critical Cicuta spp. Cowslip Mild Primula spp. Coxella Mild Dieffenbachia spp. Crane Flower Mild Strelitzia reginae Crassula arborescens Mild Silver Dollar Plant, Bokkeveld Tree Crassula Crassula argentea Mild Jade Plant Creek Sandpaper Fig Mild Ficus spp. Creeping Buttercup Severe Ranunculus spp. Creeping Groundsel Critical Senecio spp. Creeping Woodsorrel Critical Oxalis spp. Cretan Sowbread Critical Cyclamen spp. Crotalaria spp. Severe Rattlepods, Showy Rattlebox Crown-Of-Thorns Moderate Euphorbia spp. Crownleaf Lobelia Moderate Lobelia spp. Cuban Raintree Severe Brunfelsia spp. Cuban Zephyrlily Moderate Amaryllis spp. Cuckoo-Pint Mild Arum maculatum Cup-Seed Critical Lyonia spp. Curled Dock Critical Rumex spp. Currant Tomato Moderate Lycopersicon spp. Cursed Crowfoot Severe Ranunculus spp. Cut-Leaf Philodendron Mild Philodendron spp. Cut-Leaved Begonia Severe Begonia spp. Cutleaf Burnweed Critical Senecio spp. Cycas Family Critical Cycas spp. Cycas revoluta Critical Sago Cycad Cycas spp. Critical Sago Cycad, Cycas Family Cyclamen spp. Critical Sowbread, Ivy-Leaved Cyclamen Cyclamen-Leaf Violet Critical Cyclamen spp. Cyclanthus Family Critical Cyclamen spp. Cymbopogon citratus Severe Lemon Grass Cymopterus spp. Mild Springparsleys, Alpine False Springparsley Cynoglossum amabile Severe Chinese Forget-Me-Not Cypress Spurge Moderate Euphorbia spp. Cypress Vine Moderate Ipomoea spp. Cyprus Cyclamen Critical Cyclamen spp. Cytisus scoparius Moderate Scotch Broom, Prostrate Broom
Daffodils Severe Narcissus spp. Daffodils Severe Narcissus jonquilla Dahlia Hedgehog Cactus Moderate Dahlia spp. Dahlia spp. Moderate Dahlias, Garden Dahlia Dahlia-Root Cereus Moderate Dahlia spp. Dahlias Moderate Dahlia spp. Dahoon Holly Mild Ilex spp. Dark-Red Helleborine Moderate Helleborus spp. Dark-Throated Shooting Star Mild Primula spp. Datilillo Yucca Critical Yucca spp. Datura spp. Severe Devil's and Angel's Trumpets, Devil's Trumpets Datura stramonium Severe Jimsonweed, Purple Thorn-Apple Daurian Rhododendron Critical Rhododendron spp. Dawson Crabapple Severe Malus spp. Day Jessamine Severe Cestrum spp. Daylilies Critical Hemerocallis spp. Daylilies and Allies Critical Hemerocallis spp. Delphinium spp. Critical Larkspurs, Larkspurs and Monkshoods Deptford Pink Mild Dianthus spp. Desert Deathcamas Severe Zigadenus spp. Desert Fiddleneck Critical Amsinckia spp. Desert Larkspur Critical Delphinium spp. Desert Rose Severe Adenium obesum Desert Thorn-Apple Severe Datura spp. Devil's and Angel's Trumpets Severe Datura spp. Devil's Thorn Critical Rumex spp. Devil's Trumpets Severe Datura spp. Devil's Walkingstick Mild Aralia spinosa Devil's-Apple Moderate Solanum linnaeanum Dianthus barbatus Mild Sweet-William, Brotero's Pink Dianthus spp. Mild Pinks, Carnations Dieffenbach's Koromiko Mild Dieffenbachia spp. Dieffenbachia amoena Mild Dumb Canes Dieffenbachia picta Mild Tuftroot Dieffenbachia spp. Mild Dumb Canes, Tuftroot Digitalis purpurea Critical Purple Foxglove Docks Critical Rumex spp. Dogbane Family Moderate Apocynum spp. Dogbanes Moderate Apocynum spp. Doghobble Critical Leucothoe spp. Dogwoods, Hydrangeas, and Allies Moderate Hydrangea spp. Dominican Staggerbush Critical Lyonia spp. Donkey Ears Moderate Kalanchoe spp. Douglas Iris Mild Iris spp. Douglas' Fiddleneck Critical Amsinckia spp. Douglas' Milkvetch Severe Astragalus spp. Downy Holly Mild Ilex spp. Downy Lobelia Moderate Lobelia spp. Downy Mistletoe Moderate Phoradendron spp. Downy Thorn-Apple Severe Datura spp. Dracaena deremensis Severe Cornstalk Dracaena Dracaena draco Moderate Dragon-Tree Dracaena godseffiana Moderate Dracaena marginata Severe Madagascar Dragon-Tree Dracaena sanderiana Moderate Lucky Bamboo Dracaena spp. Severe Agave and Allies, Dragon Trees Dragon Blood Tree Severe Dracaena spp. Dragon Trees Severe Dracaena spp. Dragon-Tree Severe Dracaena spp. Dragon-Tree Moderate Dracaena draco Dragon's-Head Lily Mild Gladiolus spp. Drill Grass Critical Equisetum spp. Drummond's Maple Critical Acer rubrum Drummond's Milkvetch Severe Astragalus spp. Drummond's Woodsorrel Critical Oxalis spp. Drumstick Primrose Mild Primula spp. Duc van Thol-Tulip Severe Tulipa spp. Dumb Canes Mild Dieffenbachia amoena Dumb Canes Mild Dieffenbachia spp. Dumortier's Daylily Critical Hemerocallis spp. Dune Celery Critical Cicuta spp. Dwarf Alpine Hawk's-Beard Severe Clivia spp. Dwarf Bristly Locust Severe Robinia spp. Dwarf Cabbage Tree Moderate Cordyline spp. Dwarf Caladium Mild Caladium spp. Dwarf Crested Iris Mild Iris spp. Dwarf Heliotrope Severe Heliotropium spp. Dwarf Horsetail Critical Equisetum spp. Dwarf Iris Mild Iris spp. Dwarf Larkspur Critical Delphinium spp. Dwarf Lupine Critical Lupinus spp. Dwarf Milkroof Moderate Apocynum spp. Dwarf St. John's Wort Mild Hypericum spp. Dwarf Strawberry Bush Moderate Euonymus spp. Dwarf Yucca Critical Yucca spp.
Hairy Afrikaner Mild Gladiolus spp. Hairy Alpenrose Critical Rhododendron spp. Hairy Black Nightshade Critical Solanum nigrum Hairy Brackenfern Severe Pteridium aquilinum Hairy Buttercup Severe Ranunculus spp. Hairy Chervil Critical Cicuta spp. Hairy Chervil Critical Ligustrum spp. Hairy Clematis Mild Clematis spp. Hairy Heliotrope Severe Heliotropium spp. Hairy Oxytrope Critical Oxytropis spp. Hairy Primrose Mild Primula spp. Hairy St John's-Wort Mild Hypericum spp. Hairy Tare Critical Vicia spp. Hairy Vetch Critical Vicia spp. Hairy Yellow-Vetch Critical Vicia spp. Hairypink Mild Dianthus spp. Hall's Crab Severe Malus spp. Hananoki Maple Critical Acer rubrum Hangehange Critical Ligustrum spp. Haplopappus heterophyllus Severe Southern Goldenbush Hardleaf Asparagus Severe Dracaena spp. Hardleaf Asparagus Moderate Asparagus spp. Hardy Begonia Severe Begonia spp. Harkness Popcorn Flower Critical Amsinckia spp. Harland's Box Critical Buxus spp. Hastate-Leaved Dock Critical Rumex spp. Hauli Tree Mild Ficus spp. Hawaiian Bracken Fern Severe Pteridium aquilinum Hawksworth's Mistletoe Moderate Phoradendron spp. He-Huckleberry Critical Lyonia spp. He-Huckleberry Critical Ligustrum spp. Heart of Jesus Mild Caladium spp. Heart-Leaf Milkweed Critical Asclepias spp. Heart-Leaf Philodendron Moderate Hedera spp. Heart-Leaf Philodendron Mild Philodendron spp. Heart-Leaf Philodendron Mild Philodendron cordatum Heartleaf Storksbill Moderate Pelargonium spp. Heartleaf Twayblade Moderate Helleborus spp. Heath Groundsel Critical Senecio spp. Heathers, Balsams, Primroses, and Allies Mild Primula spp. Heavenly Bamboo Critical Nandina domestica Hedera helix Moderate Common Ivy, English Ivy Hedera spp. Moderate Ivies, Common Ivy Helenium autumnale Moderate Common Sneezeweed, Autumn Sneezeweed Heliotropes Severe Heliotropium spp. Heliotropium spp. Severe Borage Family, Heliotropes Hellebores Moderate Helleborus spp. Hellebores and Lenten Roses Moderate Helleborus spp. Helleborines Moderate Helleborus spp. Helleborus niger Moderate Christmas-Rose, Black Hellebore Helleborus spp. Moderate Hellebores and Lenten Roses, Hellebores Hemerocallis spp. Critical Daylilies, Asphodels Hemp Dogbane Moderate Apocynum spp. Hemp Dogbane Moderate Apocynum cannabinum Henderson's Shooting Star Mild Primula spp. Henderson's Wavewing Mild Cymopterus spp. Heracleum maximum Mild Common Cowparsnip, Tube Clematis Herbaceous Periwinkle Critical Vinca spp. Herzog Cestrum Severe Cestrum spp. Hibiscuses Severe Tulipa spp. High-Latitude Oaks Critical Quercus spp. Highclere Holly Mild Ilex spp. Highlands Locust Severe Robinia spp. Hill Country Yellow Buckeye Severe Aesculus spp. Himalayan Clematis Mild Clematis spp. Himalayan Ivy Moderate Hedera spp. Himalayan Pea Severe Laburnum spp. Himalayan Yew Critical Taxus spp. Hioi Mild Mentha spp. Hippeastrum spp. Severe South American Amaryllis, Swamplilies Hoary Alyssum Critical Berteroa incana Hoary Mugwort Moderate Artemisia spp. Hollies Mild Ilex spp. Hollyhock Begonia Severe Begonia spp. Hollyleaf Cherry Critical Prunus spp. Holm Oak Critical Quercus spp. Holm Oak Mild Ilex spp. Hooked Buttercup Severe Ranunculus spp. Hoop-Petticoat Daffodil Severe Narcissus spp. Horned Dock Critical Rumex spp. Horse Mint Mild Mentha spp. Horse-Chestnut Severe Aesculus spp. Horse-Chestnut Severe Aesculus hippocastanum Horseshoe Geranium Moderate Pelargonium spp. Horsetail Family Critical Equisetum spp. Horsetail Milkweed Critical Asclepias spp. Horsetails Critical Equisetum spp. Hortensia Moderate Hydrangea arborescens Hosta plantaginea Mild Scented Hosta Humboldt's Lily Critical Lilium spp. Humulus lupulus Critical Common Hops, Western Hop Hungarian Vetch Critical Vicia spp. Hupeh Crabapple Severe Malus spp. Hyacinth Moderate Hyacinthus orientalis Hyacinth Moderate Hyacinthus spp. Hyacinth Bean Moderate Hyacinthus spp. Hyacinth Orchids Moderate Hyacinthus spp. Hyacinth Subfamily Moderate Hyacinthus spp. Hyacinth Tribe Moderate Hyacinthus spp. Hyacinthus orientalis Moderate Hyacinth Hyacinthus spp. Moderate Hyacinth Subfamily, Hyacinth Tribe Hybrid Bluebell Moderate Hyacinthus spp. Hybrid Laburnum Severe Laburnum spp. Hybrid Monkshood Severe Aconitum spp. Hybrid Rhododendron Critical Rhododendron spp. Hydrangea arborescens Moderate Wild Hydrangea, Hortensia Hydrangea Family Moderate Hydrangea spp. Hydrangea spp. Moderate Hydrangeas, Dogwoods, Hydrangeas, and Allies Hydrangeas Moderate Hydrangea spp. Hyoscyamus niger Severe Black Henbane Hypericum perforatum Mild Common St. John's-Wort Hypericum Sect. Myriandra Mild Hypericum spp. Hypericum spp. Mild St. John's Worts Tribe, St. John's Worts Hypericum Subsect. Centrosperma Mild Hypericum spp. Hypochaeris radicata Mild Common Cat's-Ear
Jack-In-The-Pulpit Mild Arisaema triphyllum Jade Plant Mild Crassula argentea Jamaican Raintree Severe Brunfelsia spp. Japanese Andromeda Critical Pieris japonica Japanese Cherry Critical Prunus spp. Japanese Crabapple Severe Malus spp. Japanese Holly Mild Ilex spp. Japanese Honeysuckle Mild Clematis spp. Japanese Horse-Chestnut Severe Aesculus spp. Japanese Ivy Moderate Hedera spp. Japanese Morning Glory Moderate Ipomoea spp. Japanese Plum Critical Prunus spp. Japanese Skunk Cabbage Mild Symplocarpus foetidus Japanese Spindle Tree Moderate Euonymus spp. Japanese Superb Fig Mild Ficus spp. Japanese Tree Lilac Critical Ligustrum japonicum Japanese Tree Lilac Critical Ligustrum spp. Japanese Walnut Severe Juglans spp. Japanese Wisteria Mild Wisteria spp. Japanese Yew Critical Taxus spp. Japanese Yew Critical Taxus cuspidata Japanese-Lantern Severe Physalis alkekengi Jequirity Bean Critical Abrus precatorius Jerusalem Cherry Critical Solanum spp. Jerusalem Cherry Severe Solanum pseudocapsicum Jerusalem Oak Critical Chenopodium botrys Jewels of Opar Mild Chrysanthemum spp. Jimsonweed Severe Datura spp. Jimsonweed Severe Datura stramonium Johnson Grass Severe Sorghum halepense Johnson Grass Critical Sorghum spp. Johnsongrasses, Milos, Sudangrasses, and Allies Critical Sorghum spp. Johnsongrasses, Milos, Sudangrasses, Indiangrasses, and Allies Critical Sorghum spp. Jointed Charlock Moderate Raphanus raphanistrum Jojoba Critical Buxus spp. Jonquil Severe Narcissus spp. Jonquil Severe Narcissus jonquilla Joseph's Coat Severe Amaranthus spp. Joshua Tree Critical Yucca spp. Juglans nigra Severe Eastern Black Walnut Juglans spp. Severe Beeches, Oaks, Walnuts, and Allies, Walnuts Juniper Mistletoe Moderate Phoradendron spp.
Laburnum Severe Laburnum spp. Laburnum spp. Severe Laburnum, Common Laburnum Lace Aralia Moderate Polyscias guilfoylei Lambert's Locoweed Critical Oxytropis spp. Lance Dracaena Severe Dracaena spp. Lanceleaf Rattlebox Severe Crotalaria spp. Lancewood Moderate Hedera spp. Lantana camara Critical Common Lantana, New Gold Lantana Lapland Azalea Critical Rhododendron spp. Large Brown-Afrikaner Mild Gladiolus spp. Large Gallberry Mild Ilex spp. Large Rattlepod Severe Laburnum spp. Large Yellow Vetch Critical Vicia spp. Large-Flowered Fiddleneck Critical Amsinckia spp. Large-Flowered Gladiolus Mild Gladiolus spp. Large-Headed Woolly Yarrow Moderate Achillea millefolium Large-Leaved Box Critical Buxus spp. Large-Leaved Dragon Tree Severe Dracaena spp. Large-Leaved Lupine Critical Lupinus spp. Large-Leaved Spindle Moderate Euonymus spp. Largeflower Pink-Sorrel Critical Oxalis spp. Larkspurleaf Monkshood Severe Aconitum spp. Larkspurs Critical Delphinium spp. Larkspurs and Monkshoods Critical Delphinium spp. Lash String-Of-Stars Severe Heliotropium spp. Late Tulip Severe Tulipa spp. Lathyrus latifolius Critical Broad-Leaved Sweet Pea Lathyrus odoratus Critical Sweet Pea Latin Thorn-Apple Severe Datura spp. Laurus nobilis Severe Bay Laurel Lavender Sorrel Critical Oxalis spp. Lavendula angustifolia Moderate Common Lavender Laxmann's Milkvetch Severe Astragalus spp. Leafy Mistletoes Moderate Phoradendron spp. Least Yellow-Sorrel Critical Oxalis spp. Leichhardt's Datura Severe Datura spp. Lemon Severe Citrus limonia Lemon Grass Severe Cymbopogon citratus Lemon Lily Critical Lilium spp. Lemon Verbena Moderate Aloysia triphylla Lenten-Rose Moderate Helleborus spp. Leopard Lily Critical Lilium spp. Lesser Branched Horsetail Critical Equisetum spp. Lesser Celandine Severe Ranunculus spp. Lesser Periwinkle Critical Vinca spp. Lesser Spearwort Severe Ranunculus spp. 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 Lilies Severe Tulipa spp. Lilium longiflorum Critical Easter Lily Lilium occidentale Severe Western Lily Lilium philadelphicum Severe Wood Lily Lilium rubrum Critical Lilium speciosum Lilium speciosum Critical Showy Japanese Lily, Lilium rubrum Lilium spp. Critical True Lilies, Martagon Lily Lilium tigrinum Critical Tiger Lily Little Walnut Severe Juglans spp. Littlebell Moderate Ipomoea spp. Lobelia cardinalis Moderate Cardinal Flower Lobelia spp. Moderate Lobelias, Typical Lobelias Lobelia Subfamily Moderate Lobelia spp. Lobelias Moderate Lobelia spp. Loco Indigo Critical Oxytropis spp. Locoweed Critical Oxytropis spp. Locust Trees Severe Robinia spp. Long Storksbill Moderate Pelargonium spp. Long-Spined Thorn-Apple Severe Datura spp. Long-Stalked Rape Moderate Brassica spp. Longbract Wild Indigo Critical Leucothoe spp. Longstalk Springparsley Mild Cymopterus spp. Longstem Bushlily Severe Clivia spp. Loose-Flowered Euonymus Moderate Euonymus spp. Lopsided Indiangrass Critical Sorghum spp. Lords and Ladies Mild Arum maculatum Lovage Mild Levisticum officinale Love-Lies-Bleeding Severe Amaranthus spp. Lovely Azalea Critical Rhododendron spp. Low Goosefoot Critical Chenopodium botrys Low Larkspur Critical Delphinium spp. Low Rattlebox Severe Crotalaria spp. Low St. John's Wort Mild Hypericum spp. Lower California Buckeye Severe Aesculus spp. Lozenge-Guide Gladioli Mild Gladiolus spp. Lucky Bamboo Severe Dracaena spp. Lucky Bamboo Moderate Dracaena sanderiana Lupines Critical Lupinus spp. Lupinus spp. Critical Lupines, Brooms, Lupines, and Allies Lurid Storksbill Moderate Pelargonium spp. Lycopersicon spp. Moderate Nightshades, Tomato Lyon's Pentachaeta Critical Lyonia spp. Lyon's Phacelia Critical Lyonia spp. Lyonia spp. Critical Lyonias, Fetterbush Lyonia Lyonias Critical Lyonia spp.
Macadamia integrifolia Severe Macadamia Tree, Nelmac II Macadamia Tree Severe Macadamia integrifolia Madagascar Cycad Critical Cycas spp. Madagascar Dragon-Tree Severe Dracaena spp. Madagascar Dragon-Tree Severe Dracaena marginata Madagascar Periwinkle Critical Vinca rosea Madagascar Periwinkle Critical Vinca spp. Madagascar Ragwort Critical Senecio spp. Madeiran Ivy Moderate Hedera spp. Magenta Stork's-Bill Moderate Pelargonium spp. Magnificent Brunfelsia Severe Brunfelsia spp. Magnolias Severe Tulipa spp. Mahogany Mistletoe Moderate Phoradendron spp. Maiden Pink Mild Dianthus spp. Maire's Yew Critical Taxus spp. Majorcan Hellebore Moderate Helleborus spp. Malay Banyan Critical Ficus microcarpa Malheur Valley Fiddleneck Critical Amsinckia spp. Malus spp. Severe Apples, Apple Malus sylvestrus Severe Apple, European Wild Apple Manac Raintree Severe Brunfelsia spp. Manchurian Crabapple Severe Malus spp. Manchurian Monkshood Severe Aconitum spp. Manchurian Walnut Severe Juglans spp. Mangrove Fern Severe Citrus mitis Mantle Storksbill Moderate Pelargonium spp. Manyleaf Sorrel Critical Oxalis spp. Marble Queen Mild Epipremnum aureum Marchlily Subtribe Moderate Amaryllis spp. Marguerite Daisy Mild Chrysanthemum spp. Mariposa Lilies Severe Tulipa spp. Marsh Gladiolus Mild Gladiolus spp. Marsh Helleborine Moderate Helleborus spp. Marsh Horsetail Critical Equisetum spp. Marsh Labrador Tea Critical Rhododendron spp. Martagon Lily Critical Lilium spp. Matchwood Mild Schefflera spp. Matted Pratia Moderate Lobelia spp. Max Chrysanthemum Mild Chrysanthemum spp. May Lily Moderate Lobelia spp. Mayapple Critical Podophyllum peltatum Maydell's Point-Vetch Critical Oxytropis spp. Meadow Buttercup Severe Ranunculus spp. Meadow Deathcamas Severe Zigadenus spp. Meadow Horsetail Critical Equisetum spp. Mediterranean Asparagus Moderate Asparagus spp. Mediterranean Marigold Mild Chrysanthemum spp. Mediterranean Radish Moderate Raphanus raphanistrum Mediterranean Spurge Moderate Euphorbia spp. Melia azedarach Critical Chinaberry Mentha pulegium Mild Pennyroyal Mentha spp. Mild Mints, Balms, Mints, and Thymes Menzies' Larkspur Critical Delphinium spp. Mesa Fiddleneck Critical Amsinckia spp. Mesquite Mistletoe Moderate Phoradendron spp. Metel Devil's Trumpet Severe Datura spp. Mexican Breadfruit Mild Monstera deliciosa Mexican Giant Horsetail Critical Equisetum spp. Mexican Lily Severe Hippeastrum spp. Mexican Plum Critical Prunus spp. Mexican Primrose-Willow Critical Ligustrum spp. Mexican Tea Critical Chenopodium ambrosioides Mexican Walnut Severe Juglans spp. Mexican Yew Critical Taxus spp. Michigan Lily Critical Lilium spp. Micronesian Cycad Critical Cycas spp. Mile-A-Minute Vine Moderate Ipomoea spp. Milkvetches Severe Astragalus spp. Milkweeds Critical Asclepias spp. Miniature Lupine Critical Lupinus spp. Miniature Umbrella Tree Mild Schefflera spp. Mints Mild Mentha spp. Missouri Milkvetch Severe Astragalus spp. Mistassini Primrose Mild Primula spp. Mock Azalea Critical Rhododendron spp. Mogoll Deathcamas Severe Zigadenus spp. Mojave Yucca Critical Yucca spp. Monk's-Hood Severe Aconitum spp. Monk's-Rhubarb Critical Rumex spp. Monkshoods Severe Aconitum spp. Monstera deliciosa Mild Swiss Cheese Plant, Ceriman Monstera spp. Mild Swiss Cheese Plant, Shingles Plant Montpelier Milkvetch Severe Astragalus spp. Moonflower Moderate Ipomoea spp. Moonflower Moderate Ipomoea alba Moore's Horsetail Critical Equisetum spp. Mophead Hydrangea Moderate Hydrangea spp. Moreton Bay Fig Mild Ficus spp. Morning-Glories Moderate Ipomoea spp. Mother of Thousands Moderate Kalanchoe spp. Mother-In-Law's Tongue Severe Dracaena spp. Mother-In-Law's Tongue Moderate Hyacinthus spp. Moundlily Yucca Critical Yucca spp. Mountain Azalea Critical Rhododendron spp. Mountain Cabbage Tree Severe Dracaena spp. Mountain Cabbage Tree Moderate Cordyline spp. Mountain Deathcamas Severe Zigadenus spp. Mountain Doghobble Critical Leucothoe spp. Mountain Holly Mild Ilex spp. Mountain Hydrangea Moderate Hydrangea spp. Mountain Laurel Critical Kalmia latifolia Mountain Laurel Critical Kalmia spp. Mountain Milkvetch Critical Oxytropis spp. Mountain Oxytrope Critical Oxytropis spp. Mountain Springparsley Mild Cymopterus spp. Mountain Wild-Laburnum Severe Laburnum spp. Mountain Winterberry Mild Ilex spp. Mountain Woodsorrel Critical Oxalis spp. Mountain Yarrow Moderate Achillea millefolium Mountain Yucca Critical Yucca spp. Mountain-Laurels Critical Kalmia spp. Mugwort Moderate Artemisia spp. Multi-Flowered Buttercup Severe Ranunculus spp. Musk Stork's-Bill Critical Cicuta spp. Mustard Family Moderate Brassica spp. Mustards, Capers, and Allies Moderate Brassica spp. Myrrhleaf Storksbill Moderate Pelargonium spp. Myrtle Dahoon Mild Ilex spp. Mzimvubu Craneflower Mild Strelitzia reginae
Pacific Crab Apple Severe Malus spp. Pacific Glasswort Moderate Asparagus spp. Pacific Mistletoe Moderate Phoradendron spp. Pacific Ponderosa Pine Critical Pinus ponderosa Pacific Rhododendron Critical Rhododendron spp. Pacific Yew Critical Taxus spp. Paddle Plant Moderate Kalanchoe spp. Padre's Shooting Star Mild Primula spp. Paeonia officinalis Mild Common Peony Painted Buckeye Severe Aesculus spp. Painted Lady Mild Gladiolus spp. Painted Leaf Moderate Euphorbia spp. Pale Pink-Sorrel Critical Oxalis spp. Pale Yucca Critical Yucca spp. Pale-Flowered Vetch Critical Vicia spp. Pale-Spiked Lobelia Moderate Lobelia spp. Palestine Arum Mild Arum Palaestinum Palmate-Leaved Oxalis Critical Oxalis spp. Palmer's Amaranth Severe Amaranthus spp. Palmer's Milkvetch Severe Astragalus spp. Pānakenake Moderate Lobelia spp. Panamint Springparsley Mild Cymopterus spp. Panda Plant Moderate Kalanchoe spp. Pandan Moderate Amaryllis spp. Panicle Hydrangea Moderate Hydrangea spp. Paperwhite Severe Narcissus spp. Paradise Apple Severe Malus spp. Paris Daisy Mild Chrysanthemum spp. Parish's Burning Bush Moderate Euonymus occidentalis Parish's Nightshade Critical Solanum spp. Parry's Primrose Mild Primula spp. Partridge Pypie Mild Gladiolus spp. Pasture Heliotrope Severe Heliotropium spp. Patē Mild Schefflera spp. Patience Dock Critical Rumex spp. Peace Lily Mild Spathiphyllum spp. Peach Critical Prunus spp. Peach Severe Prunus persica Peacock Flower Mild Caesalpinia pulcherrima Peacock-Eye Pink Mild Dianthus spp. Pear-Leaf Crabapple Severe Malus spp. Peelbark St. John's Wort Mild Hypericum spp. Pelargonium spp. Moderate Geraniums and Storksbills, True Storksbills Pelargonium x hortorum Moderate Garden Geranium Pencil Cactus Moderate Euphorbia tirucalli Peninsula Hooded Storksbill Moderate Pelargonium spp. Pennyroyal Mild Mentha pulegium Pennyroyal Mild Mentha spp. Penwiper Moderate Kalanchoe spp. Peppermint Mild Mentha spp. Perilla frutescens Moderate Beefsteak Plant, Shiso Periwinkle Critical Vinca rosea Periwinkles Critical Vinca spp. Persea americana Critical Avocado Persian Cyclamen Critical Cyclamen spp. Persian Ivy Moderate Hedera spp. Persian Walnut Severe Juglans spp. Peruvian Tomato Moderate Lycopersicon spp. Petiolate Fig Mild Ficus spp. Petroselinum crispum Mild Garden Parsley Petty Spurge Moderate Euphorbia spp. Philadelphia Fleabane Severe Robinia spp. Philodendron bipinnatifidum Mild Tree Philodendron, Philodendron Selloum Philodendron cordatum Mild Heart-Leaf Philodendron Philodendron Selloum Mild Philodendron bipinnatifidum Philodendron spp. Mild Philodendrons, Red Princess Philodendrons Mild Philodendron spp. Phoradendron flavescens Moderate American Mistletoe Phoradendron spp. Moderate Leafy Mistletoes, American Mistletoe Physalis alkekengi Severe Japanese-Lantern, Chinese Lantern Plant Pickleweeds Moderate Asparagus spp. Pieris japonica Critical Japanese Andromeda Pig's Ears, Flaming Katies, Butterbushes, and Allies Moderate Kalanchoe spp. Pigweed Critical Portulaca oleracea Pikes Peak Springparsley Mild Cymopterus spp. Pilgrim Iris Mild Iris spp. Pin Oak Critical Quercus spp. Pine Lily Critical Lilium spp. Pineapple Zamia Critical Zamia spp. Pinebarrens Death-Camas Severe Zigadenus spp. Pineland Heliotrope Severe Heliotropium spp. Pineleaf Lobelia Moderate Lobelia spp. Pineneedle Milkweed Critical Asclepias spp. Pineweed Mild Hypericum spp. Pinewood Bracken Severe Pteridium aquilinum Pink Ivy-Leaved Speedwell Moderate Hedera spp. Pink Turtlehead Critical Lyonia spp. Pink-Sorrel Critical Oxalis spp. Pinks Mild Dianthus spp. Pinks, Cactuses, and Allies Severe Amaranthus spp. Pinus ponderosa Critical Ponderosa Pine, Southwestern Ponderosa Pine Pinxter Flower Critical Rhododendron spp. Piper Mistletoe Moderate Phoradendron spp. Pipestem Clematis Mild Clematis spp. Pitcher's Leatherflower Mild Clematis spp. Plains Cymopterus Mild Cymopterus spp. Plains Yucca Critical Yucca spp. Plum Critical Prunus spp. Plums, Cherries, and Allies Critical Prunus spp. Pochote Severe Aesculus spp. Podocarpus macrophyllus Mild Kusamaki, Yew Plum Pine Podophyllum peltatum Critical Mayapple Poet's Ivy Moderate Hedera helix Poet's Narcissus Severe Narcissus spp. Poinsettia Moderate Euphorbia pulcherrima Poinsettia Moderate Euphorbia spp. Poison Hemlock Critical Cicuta spp. Poison Hemlock Critical Conium maculatum Poke Milkweed Critical Asclepias spp. Polka Dot Begonia Severe Begonia spp. Polyanthus Mild Primula spp. Polynesian Heliotrope Severe Heliotropium spp. Polyscias guilfoylei Moderate Lace Aralia Ponderosa Pine Critical Pinus ponderosa Pondo Bushlily Severe Clivia spp. Poor Man's Cycad Critical Zamia spp. Port Jackson Fig Mild Ficus spp. Portuguese Laurel Critical Prunus spp. Portulaca oleracea Critical Common Purslane, Pigweed Possum Grape Moderate Phoradendron spp. Possumhaw Mild Ilex spp. Post Oak Critical Quercus spp. Potato Critical Solanum spp. Potato Moderate Solanum tuberosum Potato Vine Critical Solanum spp. Powell's Amaranth Severe Amaranthus spp. Prairie Brome Critical Kalmia spp. Prairie Crab Apple Severe Malus spp. Prairie Larkspur Critical Delphinium spp. Precatory Bean Critical Abrus precatorius Primrose Mild Primula spp. Primrose Mild Primula vulgaris Primrose-Peerless Severe Narcissus spp. Primroses Mild Primula spp. Primula spp. Mild Heathers, Balsams, Primroses, and Allies, Primroses Primula vulgaris Mild Primrose Privets Critical Ligustrum spp. Proctor's Staggerbush Critical Lyonia spp. Procumbent Pigweed Severe Amaranthus spp. Prostrate Amaranth Severe Amaranthus spp. Prostrate Broom Moderate Cytisus scoparius Prostrate Globe-Amaranth Severe Amaranthus spp. Prostrate Pigweed Severe Amaranthus spp. Prostrate Sandmat Moderate Euphorbia spp. Pruinose Thorn-Apple Severe Datura spp. Prunus laurocerasus Severe Cherry Laurel Prunus persica Severe Peach, Nectarine Prunus serotina Severe Black Cherry, Escarpment Black Cherry Prunus spp. Critical Plums, Cherries, and Allies, Black Cherry Pteridium aquilinum Severe Common Bracken, Eagle Fern Puawhananga Mild Clematis spp. Puerto Rican Raintree Severe Brunfelsia spp. Punakuru Moderate Lobelia spp. Purple Amaranth Severe Amaranthus spp. Purple Cestrum Severe Cestrum spp. Purple Clematis Mild Clematis spp. Purple Crab Severe Malus spp. Purple Foxglove Critical Digitalis purpurea Purple Milk-Vetch Severe Astragalus spp. Purple Milkweed Critical Asclepias spp. Purple Nightshade Critical Solanum spp. Purple Springparsley Mild Cymopterus spp. Purple Thorn-Apple Severe Datura spp. Purple Thorn-Apple Severe Datura stramonium Purple Viper's-Bugloss Severe Echium plantagineum Purple Woodsorrel Critical Oxalis spp. Purple Woodsorrel Severe Laburnum spp. Purple-Flowered Washington Lily Critical Lilium spp. Purple-Nerve Cymopterus Mild Cymopterus spp. Pyrenean Squill Moderate Hyacinthus spp.
Sacramento Waxydogbane Critical Cyclamen spp. Sacred Datura Severe Datura spp. Sacred Fig Mild Ficus spp. Sagebrush Buttercup Severe Ranunculus spp. Sago Cycad Critical Cycas spp. Sago Cycad Critical Cycas revoluta Saharan Mustard Moderate Brassica spp. Saintfoin Milk Vetch Severe Astragalus spp. Salt Marsh Bird's Beak Moderate Cordyline spp. Saltmarsh Morning-Glory Moderate Ipomoea spp. Salton Milkvetch Severe Crotalaria spp. San Bernardino Larkspur Critical Delphinium spp. San Diego Sagewort Moderate Artemisia spp. Sand Cherry Critical Prunus spp. Sand Myrtle Critical Kalmia spp. Sand Pink Mild Dianthus spp. Sand Sagebrush Moderate Artemisia spp. Sand Thorn-Apple Severe Datura spp. Sandbog Death Camas Severe Zigadenus spp. Sandhill Laurel Critical Kalmia spp. Sandhill Milkweed Critical Asclepias spp. Sandhill St. John's-Wort Mild Hypericum spp. Sandmats Moderate Euphorbia spp. Sandveld Ragwort Critical Senecio spp. Sansevieria trifasciata Mild Snake Plant Santa Barbara Milkvetch Severe Astragalus spp. Sargent Crabapple Severe Malus spp. Satin Pothos Mild Scindapsus pictus Sativa Marijuana Critical Cannabis sativa Scaly-Bulbed Oxalis Critical Oxalis spp. Scarlet Afrikaner Mild Gladiolus spp. Scarlet Begonia Severe Begonia spp. Scarlet Creeper Moderate Hedera spp. Scarlet Creeper Moderate Ipomoea spp. Scarlet Gilia Moderate Ipomoea spp. Scarlet Larkspur Critical Delphinium spp. Scarlet Leather Flower Mild Clematis spp. Scented Hosta Mild Hosta plantaginea Scented Storksbill Moderate Pelargonium spp. Scentless Feverfew Mild Chrysanthemum spp. Scentless Mayweed Mild Chrysanthemum spp. Schefflera actinophylla Mild Australian Umbrella Tree Schefflera spp. Mild Umbrella Trees, Patē Scindapsus aureus Mild Golden Pothos Scindapsus pictus Mild Satin Pothos Scorpion's-Tail Severe Heliotropium spp. Scotch Broom Moderate Cytisus scoparius Scots Lovage Critical Ligustrum spp. Scottish Dock Critical Rumex spp. Scrub Holly Mild Ilex opaca Sea Almond Severe Juglans spp. Sea Dahlia Moderate Dahlia spp. Sea Lavender Severe Heliotropium spp. Sea Mayweed Mild Chrysanthemum spp. Sea Wormwood Moderate Artemisia spp. Seabeach Amaranth Severe Amaranthus spp. Seaside Fiddleneck Critical Amsinckia spp. Section Begonia Severe Begonia spp. Section Iris Mild Iris spp. Section Primula Mild Primula spp. Senecio mikanioides Severe Cape-Ivy Senecio spp. Critical Groundsels, Groundsels and Allies Senecio vulgaris Severe Common Groundsel Senita Cactus Mild Monstera spp. Sepentine Hill Raintree Severe Brunfelsia spp. Serpent Garlic Critical Allium sativum Shakeshake Severe Crotalaria spp. Shallot Critical Allium cepa Shasta Lily Critical Lilium spp. Sheep Laurel Critical Kalmia angustifolia Sheep Laurel Critical Kalmia spp. Sheep's Sorrel Critical Rumex spp. Shingles Plant Mild Monstera spp. Shiso Moderate Perilla frutescens Shoddy Ragwort Critical Senecio spp. Shortpod Mustard Moderate Brassica spp. Showy Japanese Lily Critical Lilium speciosum Showy Locoweed Critical Oxytropis spp. Showy Milkweed Critical Asclepias spp. Showy Rattlebox Severe Crotalaria spp. Shrubby Milkwort Critical Buxus spp. Shrubby St. John's-Wort Mild Hypericum spp. Shumard Oak Critical Quercus spp. Siberian Crabapple Severe Malus spp. Siberian Iris Mild Iris spp. Siberian Larkspur Critical Delphinium spp. Siberian Lily Critical Lilium spp. Sicklethorn Moderate Asparagus spp. Siebold's Spindle Moderate Euonymus spp. Sierra Larkspur Critical Delphinium spp. Sierra Laurel Critical Leucothoe spp. Sierra Madre Lobelia Moderate Lobelia spp. Sierra Primrose Mild Primula spp. Sierra Shooting Star Mild Primula spp. Sierra Tiger Lily Critical Lilium spp. Silky Lupine Critical Lupinus spp. Silky Wisteria Mild Wisteria spp. Silver Bush Lupine Critical Lupinus spp. Silver Dollar Plant Mild Crassula arborescens Silver Sagebrush Moderate Artemisia spp. Silver Wormwood Moderate Artemisia spp. Silverleaf Nightshade Critical Solanum spp. Silvery Lupine Critical Lupinus spp. Simpson's Zephyr Lily Severe Hippeastrum spp. Sky Lupine Critical Lupinus spp. Skyblue Lupine Critical Lupinus spp. Sleeping Hibiscus Severe Tulipa spp. Slender Corn-Flag Mild Gladiolus spp. Slender Hyacinth-Orchid Moderate Hyacinthus spp. Slender Indiangrass Critical Sorghum spp. Slender Leafy Spurge Moderate Euphorbia spp. Slender Palm Lily Moderate Cordyline spp. Slender St John's-Wort Mild Hypericum spp. Slender Vetch Critical Vicia spp. Slender Yellow Woodsorrel Critical Oxalis spp. Slenderleaf Monkshood Severe Aconitum spp. Small Daylily Critical Hemerocallis spp. Small Jack-In-The-Pulpit Mild Arisaema triphyllum Small Pheasant´S Eye Severe Narcissus spp. Small St John's Wort Mild Hypericum spp. Small-Flowered Buttercup Severe Ranunculus spp. Small-Flowered Daffodil Severe Narcissus spp. Small-Flowered Fiddleneck Critical Amsinckia spp. Small-Flowered Milkvetch Severe Astragalus spp. Small-Fruited Crab Apple Severe Malus spp. Small-Leaf Spiderwort Mild Tradescantia fluminensis Small-Leaved Box Critical Buxus spp. Small-Leaved Clematis Mild Clematis spp. Small-Leaved Holly Mild Ilex spp. Smallflower Deathcamas Severe Zigadenus spp. Smallseed Sandmat Moderate Euphorbia spp. Smooth Crotalaria Severe Crotalaria spp. Smooth Horsetail Critical Equisetum spp. Smooth Pigweed Severe Amaranthus spp. Smooth Tare Critical Vicia spp. Snake Plant Severe Dracaena spp. Snake Plant Mild Sansevieria trifasciata Snake's-Head Fritillary Severe Tulipa spp. Sneeze Plant Moderate Kalanchoe spp. Snow Flower (Peace Lily) Mild Spathiphyllum spp. Snow-On-The-Mountain Moderate Euphorbia spp. Snowy Hydrangea Moderate Hydrangea spp. Soaptree Yucca Critical Yucca spp. Socotran Desert Rose Severe Adenium obesum Softneck Garlic Critical Allium sativum Solanum carolinense Critical Carolina Horsenettle Solanum dulcamara Mild Bittersweet Nightshade, Climbing Nightshade Solanum linnaeanum Moderate Devil's-Apple Solanum melongena Moderate Eggplant, Wild Eggplant Solanum nigrum Critical Black Nightshade Complex, Black Nightshade Solanum pseudocapsicum Severe Jerusalem Cherry Solanum spp. Critical Nightshades, Nightshades, Bindweeds, Gooseweeds, and Allies Solanum tuberosum Moderate Potato Song of India Severe Dracaena spp. Sorghum Critical Sorghum bicolor Sorghum Critical Sorghum spp. Sorghum bicolor Critical Sorghum, Broom-Corn Sorghum halepense Severe Johnson Grass, Columbus Grass Sorghum spp. Critical Johnsongrasses, Milos, Sudangrasses, and Allies, Johnson Grass Sorghum sudanense Critical Sudan Grass Sour Cherry Critical Prunus spp. South American Amaryllis Moderate Amaryllis spp. South American Amaryllis Severe Hippeastrum spp. Southern Amaranth Severe Amaranthus spp. Southern Blue Flag Mild Iris spp. Southern Blue Monkshood Severe Aconitum spp. Southern Bracken Severe Pteridium aquilinum Southern Brackenfern Severe Pteridium aquilinum Southern California Clematis Mild Clematis spp. Southern California Milkvetch Severe Astragalus spp. Southern California Walnut Severe Juglans spp. Southern Crabapple Severe Malus spp. Southern Giant Horsetail Critical Equisetum spp. Southern Goldenbush Severe Haplopappus heterophyllus Southern Great Basin Popcornflower Critical Amsinckia spp. Southern Live Oak Critical Quercus spp. Southern Magnolia Severe Tulipa spp. Southern Milkvetch Severe Astragalus spp. Southern Raintree Severe Brunfelsia spp. Southern Red Oak Critical Quercus spp. Southern Water Hemlock Critical Cicuta spp. Southernwood Moderate Artemisia spp. Southwestern Ponderosa Pine Critical Pinus ponderosa Sowbread Critical Cyclamen spp. Spanish Bluebell Moderate Hyacinthus spp. Spanish Dagger Critical Yucca spp. Spathe Flower Mild Spathiphyllum spp. Spathiphyllum spp. Mild Peace Lily, Spathe Flower Spear Mint Mild Mentha spp. Spear-Leaved Dogbane Moderate Apocynum spp. Spearmint Mild Mentha spp. Speckle-Brown Afrikaner Mild Gladiolus spp. Sphenosciadium capitellatum Mild Ranger Buttons Spindle Moderate Euonymus spp. Spindles Moderate Euonymus spp. Spineless Yucca Critical Yucca spp. Spiny Amaranth Severe Amaranthus spp. Spiny Asparagus Moderate Asparagus spp. Spiny Solanums Critical Solanum spp. Spleen Amaranth Severe Amaranthus spp. Split Leaf Climber Mild Philodendron spp. Split-Leaf Cyclanthus Critical Cyclamen spp. Spotted Spurge Moderate Euphorbia spp. Spotted St. John's Wort Mild Hypericum spp. Spotted Water-Hemlock Critical Cicuta spp. Spotted Water-Hemlock Critical Cicuta maculata Spreading Dogbane Moderate Apocynum spp. Sprenger's Asparagus Moderate Asparagus densiflorus Sprenger's Asparagus Moderate Asparagus spp. Spring Coralroot Mild Wisteria spp. Spring Sandwort Severe Citrus mitis Spring Sowbread Critical Cyclamen spp. Spring Vetch Critical Vicia spp. Springparsleys Mild Cymopterus spp. Spurge Family Moderate Euphorbia spp. Spurges Moderate Euphorbia spp. St Joseph's Lily Severe Hippeastrum spp. St Lucie Cherry Critical Prunus spp. St. Andrew's Cross Mild Hypericum spp. St. John's Wort Family Mild Hypericum spp. St. John's Worts Mild Hypericum spp. St. John's Worts Tribe Mild Hypericum spp. St. Peter's-Wort Mild Hypericum spp. Staggerbush Critical Lyonia spp. Staghorn Sumac Severe Amaranthus spp. Star Begonia Severe Begonia spp. Stemless Indian Parsley Mild Cymopterus spp. Sticky Groundsel Critical Senecio spp. Sticky Locoweed Critical Oxytropis spp. Sticky Storksbill Moderate Pelargonium spp. Stiffbranch Bird's Beak Moderate Cordyline spp. Stinging Lupine Critical Lupinus spp. Stinking Chamomile Moderate Anthemis cotula Stinking Hellebore Moderate Helleborus spp. Stinking Iris Mild Iris spp. Stonecrop Family Moderate Kalanchoe spp. Strawberry Bush Moderate Euonymus spp. Streaked Rattlepod Severe Crotalaria spp. Streaky-Guide Gladioli Mild Gladiolus spp. Strelitzia reginae Mild Common Bird-Of-Paradise Flower, Crane Flower Strigilate Cestrum Severe Cestrum spp. Striped Barbados Lily Severe Hippeastrum spp. Striped Squill Moderate Hyacinthus spp. Subalpine Larkspur Critical Delphinium spp. Subgenus Ranunculus Severe Ranunculus spp. Sudan Grass Critical Sorghum bicolor Sudan Grass Critical Sorghum spp. Sudan Grass Critical Sorghum sudanense Suji Severe Dracaena spp. Suji Moderate Cordyline spp. Summer Lupine Critical Lupinus spp. Sun Spurge Moderate Euphorbia spp. Sundial Lupine Critical Lupinus spp. Sunn Hemp Severe Crotalaria spp. Swamp Azalea Critical Rhododendron spp. Swamp Dock Critical Rumex spp. Swamp Dog-Laurel Critical Leucothoe spp. Swamp Jack-In-The-Pulpit Mild Arisaema triphyllum Swamp Laurel Critical Kalmia polifolia Swamp Laurel Critical Kalmia spp. Swamp Leatherflower Mild Clematis spp. Swamp Milkweed Critical Asclepias spp. Swamp White Oak Critical Quercus spp. Swamplilies Severe Hippeastrum spp. Swazi Calpurnia Severe Laburnum spp. Sweet Acorn Oak Critical Quercus spp. Sweet Acorn Oak Mild Ilex spp. Sweet Annie Moderate Artemisia spp. Sweet Crabapple Severe Malus spp. Sweet Marjoram Mild Origanum majorana Sweet Pea Critical Lathyrus odoratus Sweet Potato Moderate Ipomoea spp. Sweet-Scented Hellebore Moderate Helleborus spp. Sweet-William Mild Dianthus spp. Sweet-William Mild Dianthus barbatus Sweetheart Plant Mild Philodendron spp. Sweetroot Springparsley Mild Cymopterus spp. Swiss Cheese Plant Mild Monstera deliciosa Swiss Cheese Plant Mild Monstera spp. Swiss Cheese Plant Mild Philodendron spp. Symplocarpus foetidus Mild Eastern Skunk Cabbage, Japanese Skunk Cabbage Syngonium podophyllum Mild Goosefoot-Plant, Fivefingers
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