Toxic Plants

Alphabetical by common name.

Poison Control Center: Always keep the telephone number of your local Poison Control Center posted by all of your telephones. In California, the number for the California Poison Control System is: 1-800- 876-4766 = (1-800-8-POISON); TTY: 1-800-972-3323

Toxicity Class (third column in table below)

  1. Major Toxicity: These plants may cause serious illness or death. If ingested, immediately call the Poison Control Center or your doctor.
  2. Minor Toxicity: Ingestion of these plants may cause minor illnesses such as vomiting or diarrhea. If ingested, call the Poison Control Center or your doctor.
  3. Oxalates: The juice or sap of these plants contains oxalate crystals. These needle-shaped crystals can irritate the skin, mouth, tongue, and throat, resulting in throat swelling, breathing difficulties, burning pain, and stomach upset. Call the Poison Control Center or your doctor if any of these symptoms appear following ingestion of plants.
  4. Dermatitis: The juice, sap, or thorns of these plants may cause a skin rash or irritation. Wash the affected area of skin with soap and water as soon as possible after contact. The rashes may be very serious and painful. Call the Poison Control Center or your doctor if symptoms appear following contact with the plants.
  5. Animal toxicity: Pets, especially cats and dogs, frequently ingest plants. If a plant is known to be hazardous to humans, it will probably be toxic for animals as well. For a list of plants which are toxic to animals, call your local University of California Cooperative Extension office and ask for Publication 21564.


Common Name Scientific Name Toxicity Class
Achillea Achillea millefolium 2,4
Aconite Aconitum spp. 1
African boxwood Myrsine africana 2
African lily Agapanthus spp. 2,4
Agapanthus Agapanthus spp. 2,4
Agave Agave spp. 2,3,4
Aglaonema Aglaonema spp. 3,4
Ailanthus Ailanthus altissima 2,4
Alder Alnus spp. 4
Allium Allium spp. 2
Almond (seeds) Prunus spp. 1
Alocasia Alocasia spp. 3,4
Alstroemeria Alstroemeria spp. 2,4
Amaryllis Amaryllis belladonna 2,4
Amaryllis Hippeastrum spp. 2
Anemone Anemone spp. 2,4
Angel's trumpet Brugmansia spp. 1
Anthurium Anthurium spp. 3,4
Apple (seeds) Malus spp. 1
Apricot (seeds) Prunus spp. 1
Aralia, Ming Polyscias spp. 2,4
Arborvitae Thuja spp. 2,4
Arrowhead plant Syngonium podophyllum 3
Arum Arum spp. 3,4
Ash Fraxinus spp. 4
Asparagus, Garden Asparagus officinalis 4
Asparagus, Sprenger Asparagus densiflorus 4
Aster Aster spp. 4
Aucuba, Japanese Aucuba japonica 2
Autumn crocus Colchicum autumnale 1,4
Azalea Rhododendron spp. 1
Baby's breath Gypsophila paniculata 4
Balsam fir Abies balsamea 4
Barberry Berberis spp. 2,4
Begonia Begonia spp. (some spp.) 2,3
Belladonna Atropa belladonna 1
Belladonna lily Amaryllis belladonna 2,4
Bermudagrass Cynodon dactylon 4
Birch tree Betula spp. 2,4
Bird-of-paradise shrub Caesalpina gilliesii 2
Bishop's weed Ammi majus 4
Bittersweet Celastrus scandens 2
Black calla Arum spp. 3,4
Black cherry (seeds) Prunus spp. 1
Black henbane Hyoscyamus niger 1
Black locust (seeds) Robinia pseudoacacia 1
Black nightshade Solanum spp. 1
Blanket flower Gaillardia spp. 4
Bleeding heart Dicentra spp. 4
Blood lily Haemanthus spp. 2,4
Blue gum Eucalyptus spp. 2,4
Boston ivy Parthenocissus spp. 3,4
Bottle tree Brachychiton populneus 4
Bougainvillea (thorns) Bougainvillea spp. 4
Boxwood Buxus sempervirens 2,4
Brazilian pepper tree Schinus terebinthifolius 2,4
Broom Cytisus spp. 2
Buckeye Aesculus spp. 2
Buckthorn Rhamnus spp. 2,4
Burning bush Euonymus spp. 2
Bushman's poison Acokanthera spp. 1
Buttercup Ranunculus spp. 2,4
Butterfly weed Asclepias spp. 2,4
Cactus (thorns and sap) Cactus spp. 4
Cajeput tree Melaleuca quinquenervia 4
Caladium Caladium bicolor 3,4
California bay Umbellularia californica 4
California buckeye Aesculus spp. 2
California laurel Umbellularia californica 4
California pepper tree Schinus molle 4
Calla, Black Arum spp. 3,4
Calla lily Zantedeschia aethiopica 3,4
Camphor tree Cinnamomum camphora 2
Candytuft, Evergreen Iberis sempervirens 4
Cape plumbago Plumbago auriculata 4
Cardinal flower Lobelia spp. 1,4
Carnation Dianthus caryophyllus 2,4
Carolina jessamine Gelsemium sempervirens 1,4
Carolina laurel cherry Prunus caroliniana 1
Castor bean Ricinus communis 1
Century plant Agave spp. 2,3,4
Cestrum Cestrum spp. 1
Chamomile Chamaemelum nobile 4
Checkered lily Fritillaria meleagris 1
Chenille plant Acalypha spp. 2,4
Cherry (seeds) Prunus spp. 1
Chinaberry Melia azedarach 1
Chinese evergreen Aglaonema spp. 3,4
Chinese lantern Physalis spp. 1
Chinese tallow tree Sapium sebiferum 4
Chokecherry Prunus virginiana 1
Christmas rose Helleborus spp. 1,4
Chrysanthemum Chrysanthemum spp. 2,4
Cineraria Senecio hybridus 2,4
Clematis Clematis spp. 2,4
Climbing lily Gloriosa spp. 1
Clivia Clivia spp. 2,4
Coast redwood Sequoia sempervirens 2,4
Coffee plant Coffea arabica 2
Coffeeberry Rhamnus spp. 2,4
Columbine Aquilegia spp. 2
Copperleaf Acalypha spp. 2,4
Coral plant Jatropha spp. 2,4
Coral tree Erythrina spp. 1
Coralberry Symphoricarpos spp. 2
Cotoneaster Cotoneaster spp. 2
Crabapple (seeds) Malus spp. 1
Creeping Charlie Glechoma hederacea 2
Crinum lily Crinum spp. 2,4
Crocus, Autumn Colchicum autumnale 1,4
Croton Codiaeum variegatum 2,4
Crown of thorns Euphorbia spp. 2,4
Cyclamen Cyclamen spp. 2,4
Daffodil (bulb) Narcissus spp. 2,4
Daisy Chrysanthemum spp. 2,4
Daphne Daphne spp. 1
Deadly nightshade Atropa belladonna 1
Deadly nightshade Hyoscyamus niger 1
Deadly nightshade Solanum spp. 1
Death camas Zigadenus spp. 1
Delphinium Delphinium spp. 1
Desert bluebells Phacelia spp. 4
Dichondra Dichondra micrantha 4
Dieffenbachia Dieffenbachia spp. 3
Dogwood Cornus spp. 4
Dumb cane Dieffenbachia spp. 3
Dusty miller Senecio spp. (some spp.) 2,4
Dutch iris Iris spp. 2,4
Echium Echium vulgare 1,4
Elderberry (ripe fruit is nontoxic) Sambucus spp. 1
Elephant's ear Alocasia spp. 3,4
Elephant's ear Colocasia spp. 3,4
Elephant's ear Xanthosoma spp. 3,4
Elm tree Ulmus spp. 4
English daisy Bellis perennis 4
English ivy Hedera spp. 2,4
English laurel Prunus laurocerasus 1
English yew (seeds) Taxus baccata 1
Eucalyptus Eucalyptus spp. 2,4
Euonymus Euonymus spp. 2
Euphorbia Euphorbia spp. 2,4
European mistletoe Viscum album 1
Evergreen candytuft Iberis sempervirens 4
False heather Cuphea hyssopifolia 4
False Queen Anne's lace Ammi majus 4
Fescue (grass) Festuca spp. 4
Fig Ficus carica and Ficus spp. 4
Fig, Weeping Ficus spp. 4
Fig, Fiddle-leaf Ficus lyrata 4
Fiddle-leaf fig Ficus lyrata 4
Fir, Balsam Abies balsamea 4
Firetail Acalypha spp. 2,4
Firethorn Pyracantha spp. 2,4
Fishtail palm Caryota spp. 3,4
Flax Linum usitatissimum 4
Fleabane Erigeron spp. 4
Flowering tobacco Nicotiana glauca 1
Four-o'clock Mirabilis jalapa 2,4
Foxglove Digitalis purpurea 1
Frangipani Plumeria rubra 4
Garden asparagus Asparagus officinalis 4
Ginkgo Ginkgo biloba 4
Gladiolus Gladiolus spp. 2,4
Glory lily Gloriosa spp. 1
Goldenchain tree Laburnum anagyroides 2
Gopher plant Euphorbia spp. 2,4
Grape ivy Cissus rhombifolia 4
Grevillea Grevillea spp. 4
Groundcherry Physalis spp. 1
Ground ivy Glechoma hederacea 2
Guernsey lily Nerine spp. 2,4
Gum, Blue Eucalyptus spp. 2,4
Heart leaf Philodendron spp. 3,4
Heather Calluna vulgaris 1
Heliotrope Heliotropum arborescens 1
Hellebore Helleborus spp. 1,4
Hemlock, Poison Conium maculatum 1
Hemlock, Water Cicuta spp. 1
Henbane, Black Hyoscyamus niger 1
Holly (berries) Ilex spp. 2
Hollyhock Alcea rosea 4
Honey bush Melianthus spp. 1
Horsechestnut Aesculus spp. 2
Hyacinth Hyacinthus orientalis 2,4
Hydrangea Hydrangea spp. 1,4
Iceland poppy Papaver nudicaule 3,4
Indian currant Symphoricarpos spp. 2
Indian turnip Arisaema triphyllum 3,4
Iris Iris spp. 2,4
Italian arum Arum spp. 3,4
Ivy Hedera spp. 2,4
Ivy, Boston Parthenocissus spp. 3,4
Ivy, English Hedera spp. 2,4
Ivy, Grape Cissus rhombifolia 4
Ivy, Ground Glechoma hederacea 2
Jack-in-the-pulpit Arisaema triphyllum 3,4
Jade plant Crassula argentea 2,4
Japanese aucuba Aucuba japonica 2
Japanese pieris Pieris japonica 1
Japanese yew (seeds) Taxus spp. 1
Jatropha Jatropha spp. 2,4
Jequirity bean Abrus precatorius 1
Jerusalem cherry Solanum pseudocapsicum 1
Jessamine Cestrum spp. 1
Jessamine, Carolina Gelsemium sempervirens 1,4
Jimson weed Brugmansia spp. 1
Jonquil (bulb) Narcissus spp. 2,4
Juniper Juniperus spp. 2
Kaffir lily Clivia spp. 2,4
Laburnum Laburnum anagyroides 2
Lady slipper orchid Cypripedium spp. 4
Lantana Lantana camara 1
Larkspur Delphinium spp. 1
Laurel, California Umbellularia californica 4
Laurel cherry Prunus caroliniana 1
Laurel, English Prunus laurocerasus 1
Laurel, Mountain Kalmia latifolia 2
Laurel, New Zealand Corynocarpus laevigata 2
Lenten rose Helleborus spp. 1,4
Ligustrum Ligustrum spp. 2,4
Lily Lilium spp. (some spp.) 2,4
Lily, African Agapanthus spp. 2,4
Lily, Belladonna Amaryllis belladonna 2,4
Lily, Blood Haemanthus spp. 2,4
Lily, Calla Zantedeschia aethiopica 3,4
Lily, Checkered Fritillaria meleagris 1
Lily, Climbing Gloriosa spp. 1
Lily, Crinum Crinum spp. 2,4
Lily, Glory Gloriosa spp. 1
Lily, Guernsey Nerine spp. 2,4
Lily, Kaffir Clivia spp. 2,4
Lily, Peruvian Alstroemeria spp. 2,4
Lily, Spider Lycoris spp. 2
Lily, Spider Hymenocallis spp. 2,4
Lily-of-the-Nile Agapanthus spp. 2,4
Lily-of-the-valley Convallaria majalis 1,4
Lobelia Lobelia spp. 1,4
Locust, Black (seeds) Robinia pseudoacacia 1
Loquat (seeds) Eriobotrya japonica 1
Love-in-a-mist Nigella damascena 2
Love-lies-bleeding Amaranthus caudatus 1
Lupine Lupinus spp. 1
Maidenhair tree Ginkgo biloba 4
Maple Acer spp. 4
Marguerite daisy Chrysanthemum spp. 2,4
Marigold Tagetes spp. 4
Marsh marigold Caltha palustris 2
May apple Podophyllum peltatum 1
Meadow saffron Colchicum autumnale 1,4
Milkweed Asclepias spp. 2,4
Ming aralia Polyscias spp. 2,4
Mistletoe Phoradendron spp. 2,4
Mistletoe, European Viscum album 1
Monkshood Aconitum spp. 1
Morning glory (seeds) Ipomoea spp. 1
Moses-in-the-cradle Rhoeo spathacea 4
Mountain laurel Kalmia latifolia 2
Myoporum Myoporum laetum 1
Myrtle Myrtus communis 2
Myrtle Vinca spp. 1
Naked lady Amaryllis belladonna 2,4
Narcissus (bulb) Narcissus spp. 2,4
Natal plum Carissa macrocarpa 2
Nectarine (seeds) Prunus spp. 1
Nephthytis Syngonium podophyllum 3
Nerine Nerine spp. 2,4
Nettles, Stinging Urtica spp. 4
New Zealand laurel Corynocarpus laevigata 2
Night-blooming jessamine Cestrum spp. 1
Nightshade, Deadly Atropa belladonna 1
Nightshade, Deadly Hyoscyamus niger 1
Nightshade, Black or Deadly Solanum spp. 1
Oak tree (acorns) Quercus spp. 2,4
Oleander Nerium oleander 1,4
Oleander, Yellow Thevetia peruviana 1,4
Onion, Wild Allium spp. 2
Ornithogalum Ornithogalum spp. 1
Pampas grass Cortaderia selloana 1
Pansy (seeds) Viola spp. 2
Pasque flower Anemone spp. 2,4
Peach (seeds) Prunus spp. 1
Pear (seeds) Pyrus spp. 1
Pencil tree Euphorbia spp. 2,4
Pepper tree, Brazilian Schinus terebinthifolius 2,4
Pepper tree, California Schinus molle 4
Periwinkle Vinca spp. 1
Peruvian lily Alstroemeria spp. 2,4
Peruvian scilla Scilla spp. 1
Philodendron Philodendron spp. 3,4
Philodendron, Split-leaf Monstera deliciosa 3,4
Pieris, Japanese Pieris japonica 1
Pineapple Ananas comosus 4
Pink Dianthus spp. 2,4
Pittosporum Pittosporum spp. 1
Plum (seeds) Prunus spp. 1
Plumbago, Cape Plumbago auriculata 4
Plumeria Plumeria rubra 4
Poinciana Caesalpina gilliesii 2
Poinsettia Euphorbia spp. 2,4
Poison hemlock Conium maculatum 1
Poison oak Toxicodendron diversilobum 4
Pokeweed Phytolacca americana 2
Poppy Papaver spp. 2,4
Poppy, Iceland Papaver nudicaule 3,4
Potato plant (green parts) Solanum tuberosum 1
Pothos Epipremnum aureum 3,4
Pregnant onion Ornithogalum spp. 1
Primrose Primula spp. 4
Primula Primula spp. 4
Privet Ligustrum spp. 2,4
Pyracantha Pyracantha spp. 2,4
Queen Anne's lace Daucus carota 4
Queen Anne's lace, False Ammi majus 4
Ranunculus Ranunculus spp. 2,4
Redwood, Coast Sequoia sempervirens 2,4
Rhododendron Rhododendron spp. 1
Rhubarb (leaves) Rheum rhabarbarum 3
Rosary bean Abrus precatorius 1
Rosary pea Abrus precatorius 1
Rubber plant Ficus elastica 4
Rue Ruta graveolens 4
Sagebrush Artemisia spp. 4
Sago palm Cycas revoluta 2
Scarlet pimpernel Anagallis arvensis 2,4
Schefflera Schefflera actinophylla 2,4
Scotch broom Cytisus spp. 2
Shasta daisy Chrysanthemum maximum 2,4
Silk oak Grevillea spp. 4
Skunk cabbage Veratrum spp. 2
Smoke bush Cotinus coggygria 4
Snake plant Sansevieria spp. 2,4
Snakeshead Fritillaria meleagris 1
Snow-on-the-mountain Euphorbia spp. 2,4
Snowberry Symphoricarpos spp. 2
Snowdrop Galanthus spp. 2,4
Snowflake Leucojum spp. 2,4
Spathiphyllum Spathiphyllum spp. 3,4
Spider lily Lycoris spp. 2
Spider lily Hymenocallis spp. 2,4
Split-leaf philodendron Monstera deliciosa 3,4
Sprenger asparagus Asparagus densiflorus 4
Squill Scilla spp. 1
St. Johnswort Hypericum calycinum 1,4
Star-of-Bethelehem Ornithogalum spp. 1
Stinging nettles Urtica spp. 4
String of beads Senecio spp. (some spp.) 2,4
Sweet pea (seeds) Lathyrus odoratus 2
Sweet William Dianthus barbatus 2,4
Tansy Tanacetum spp. 4
Taro Colocasia esculenta 3,4
Tassel flower Amaranthus caudatus 1
Tomato (non-fruit parts) Lycopersicon esculentum 1,4
Toyon Heteromeles arbutifolia 1
Tree-of-heaven Ailanthus altissima 2,4
Tree tobacco Nicotiana glauca 1
Trumpet creeper Campsis radicans 4
Trumpet vine Campsis radicans 4
Tuberose Polianthes tuberosa 2
Tulip (bulb) Tulipa spp. 2,4
Umbrella plant Cyperus alternifolius 2
Umbrella tree Schefflera actinophylla 2,4
Vinca Vinca spp. 1
Violet (seeds) Viola spp. 2
Virginia creeper Parthenocissus spp. 3,4
Walnut Juglans spp. 4
Wandering jew Tradescantia spp. 4
Water hemlock Cicuta spp. 1
Weeping fig Ficus spp. 4
Wild onion Allium spp. 2
Windflower Anemone spp. 2,4
Wintersweet Acokanthera spp. 1
Wisteria Wisteria spp. 2
Wormwood Artemisia spp. 4
Yarrow Achillea millefolium 2,4
Yew, English (seeds) Taxus baccata 1
Yew, Japanese (seeds) Taxus spp. 1
Yew pine Podocarpus macrophyllus 2


1. Information expanded from the publication "Know Your Plants... Safe or Poisonous?" by Elise Stone (California Poison Control System), and Ann King (University of California Cooperative Extension); 1997.

2. Plant lists in this database compiled by:

Ann King Filmer, Ph.D.
Director of Communications
College of Agricultural and Environmental Sciences, Dean's Office
e-mail: afilmer@ucdavis.edu

3. With much appreciation to Dr. Olga Wu, formerly with the California Poison Control System, for her technical assistance with reviews of plant lists.



General information on Poisonous Plants Toxic Plants Safe Plants
by common name by scientific name by common name by scientific name

Author:

Ann King Filmer, Ph.D.
Director of Communications
College of Agricultural and Environmental Sciences, Dean's Office
e-mail: afilmer@ucdavis.edu

URL: http://envhort.ucdavis.edu/ce/king/