Toxic Plants

Poison Control Center: Always keep the telephone number of your local Poison Control Center posted by all of your telephones. In Montana, the number for the Nationwide Poison Control System is: 1-800- 222-1222 (TTY Equipped)
Toxicity Classes
  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 Veterinarian.
TOXIC PLANTS
Common NameBotanical NameToxicity Class
AchilleaAchillea millefolium2,4
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
BegoniaBegonia 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 pseudoacacia1
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 populneus4
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 camphora2
Candytuft, Evergreen Iberis sempervirens 4
Cape plumbago Plumbago auriculata4
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
Chrysanthemum Chrysanthemum spp 2,4
Coffee plant Coffea arabica 2
Iris Iris spp. 2,4
Ivy Hedera spp. 2,4
Ivy, Boston Parthenocissus spp. 3,4
Ivy, English Hedera spp. 2,4
Ivy, GrapeCissus 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
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 belladonna2,4
Lily, BloodHaemanthus 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, GloryGloriosa 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
Common NameBotanical NameToxicity Class
Lobelia Lobelia spp. 1,4
Locust, Black (seeds) Robinia pseudoacacia1
Loquat (seeds) Eriobotrya japonica 1
Love-in-a-mistNigella damascena 2
Love-lies-bleeding Amaranthus caudatus 1
Lupine Lupinus spp. 1
Maidenhair tree Ginkgo biloba 4
MapleAcer 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
MistletoePhoradendron spp. 2,4
Mistletoe, European Viscum album 1
Monkshood Aconitum spp. 1
Morning glory (seeds) Ipomoea spp. 1
Moses-in-the-cradleRhoeo 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 oleander1,4
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, BrazilianSchinus 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
PinksDianthus spp. 2,4
Pittosporum Pittosporum spp. 1
Plum (seeds) Prunus spp. 1
Plumbago, Cape Plumbago auriculata 4
Plumeria Plumeria rubra 4
PoincianaCaesalpina 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
PyracanthaPyracantha 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 peaAbrus precatorius 1
Rubber plant Ficus elastica 4
RueRuta 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 plantSansevieria 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 lilyHymenocallis spp. 2,4
Split-leaf philodendron Monstera deliciosa 3,4
Sprenger asparagus Asparagus densiflorus 4
Squill Scilla spp. 1
St. JohnswortHypericum 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 barbatus2,4
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
TuberosePolianthes tuberosa2
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
WalnutJuglans spp. 4
Wandering jewTradescantia 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