Scientific name |
Common name |
Notes |
References |
Abrus precatorius |
Crab's eye |
Also known as precatory bean, rosary pea, or jequirity bean |
[8] |
Acer rubrum |
Red maple, also known as swamp or soft maple |
Toxic compounds are gallic acid and tannins. |
[9][4] |
Adonis microcarpa |
Pheasant's eye |
Often found in hay. |
[10][11] |
Aesculus hippocastanum |
Horse chestnut |
Also known as buckeye |
[3] |
Ageratina |
Snakeroots |
Known poisonous species include Ageratina adenophora (Crofton weed, causes Tallebudgera horse disease) and Ageratina altissima (white snakeroot) |
[3][12] |
Aleurites |
Tung oil tree |
|
[8] |
Amsinckia intermedia |
Fiddleneck |
Contains pyrrolizidine alkaloids |
[13][14][15] |
Apocynum cannabinum |
Hemp dogbane |
Also known as Indian hemp, choctaw root, rheumatism weed, and snake's milk |
[5] |
Arctotheca calendula |
Cape weed |
|
[10] |
Armoracia lapathifolia |
Horseradish |
|
[8] |
Artemisia |
|
Known poisonous species include Artemisia tridentata (big sagebrush) and Artemisia filifolia (sand sagebrush) |
[8] |
Asclepias syriaca |
Common milkweed |
|
[4] |
Astragalus |
Locoweed, crazy weed, or milk vetch |
Contains Swainsonine |
[4][16] |
Atropa belladonna |
Deadly nightshade or belladonna |
|
[17] |
Baptisia |
False indigo |
|
[8] |
Berteroa incana |
Hoary alyssum |
|
[18] |
Brassica |
Mustards |
|
[5] |
Buxus sempervirens |
Boxwood |
|
[3] |
Celastrus scandens |
Climbing bittersweet |
|
[8] |
Centaurea |
Star-thistles, knapweeds |
Known poisonous species include Centaurea solstitialis (yellow star thistle or St. Barnaby's thistle) and Centaurea repens (Russian knapweed) |
[3][10] |
Cestrum parqui |
Green cestrum |
|
[17] |
Chrysothamnus nauseosus |
Rubber rabbitbrush |
|
[8] |
Cicuta |
Water hemlock, cowsbane |
|
[3] |
Claviceps paspali |
Paspalum ergot |
|
[10] |
Conium maculatum |
Hemlock or poison hemlock |
|
[10] |
Corydalis |
Fitweed, fumitory |
|
[8] |
Craspedia chrysantha |
Round billy button or woollyhead |
|
[10] |
Crotalaria |
Rattlepods |
|
[19] |
Cucumis myriocarpus |
Paddy melon |
|
[10] |
Cuscuta |
Dodder |
|
[8] |
Cynoglossum officinale |
Houndstongue |
|
[6] |
Datura |
Jimsonweed, thorn-apple |
|
[4][10] |
Delphinium |
Larkspur |
|
[3] |
Dendrocnide moroides |
Stinging tree or Gympie stinger |
|
[17] |
Descurainia pinnata |
Tansy mustard |
|
[8] |
Digitalis |
Foxgloves |
|
[3] |
Dryopteris filix-mas |
Male fern |
|
[8] |
Duboisia |
Corkwoods |
|
[17] |
Echium plantagineum |
Paterson's curse |
Also known as Salvation Jane, blue weed and Lady Campbell weed |
[10][20] |
Equisetum |
Horsetails, mare's tails, scouring rush |
|
[16] |
Erythrophleum chlorostachys |
Cooktown ironwood |
|
[19] |
Euphorbia |
Spurges |
|
[8] |
Festuca arundinacea |
Tall fescue |
|
[3] |
Franseria discolor |
White ragweed |
|
[8] |
Glechoma hederacea |
Ground ivy |
Also known as creeping charlie |
[3] |
Grindelia |
Gumweeds |
|
[8] |
Haplopappus heterophyllus |
Rayless goldenweed |
Also known as jimmyweed or burrow weed |
[8] |
Heliotropium |
Heliotropes |
Known poisonous species include Heliotropium amplexicaule (blue heliotrope), H. europaeum (common heliotrope), and H. supinum (creeping heliotrope) |
[10][17][21] |
Homeria |
Cape tulips |
|
[22] |
Hypericum perforatum |
St. John's wort |
Also known as Klamath weed |
[3] |
Hypochaeris radicata |
Flatweed or catsear |
Has been implicated in causing Australian stringhalt, possibly due to a toxic mold that grows on it, especially poisonous to draft horses |
[10][23] |
Jacobaea |
Ragworts |
|
|
Juglans nigra |
Black walnut |
Bedding horses in shavings or sawdust can cause laminitis |
[3] |
Juniperus virginiana |
Juniper |
|
[8] |
Kalmia latifolia |
Mountain laurel or spoonwood |
Also known as spoonwood or calico bush |
[17] |
Kochia scoparia |
Burning bush |
Also known as summer cypress or Mexican firewood |
[8] |
Lantana camara |
Yellow sage |
|
[24] |
Ligustrum |
Privets |
|
[17] |
Lolium perenne |
Perennial ryegrass |
|
[10] |
Lupinus |
Lupins |
|
[3] |
Lychee |
Lychee |
Ingesting large amounts almost certainly caused the death of four horses |
[25] |
Malva parviflora |
Mallow |
|
[10] |
Marsilea drummondii |
Nardoo |
Contains an enzyme which destroys vitamin B1, leading to brain damage in sheep and horses |
[10] |
Melilotus |
Sweetclover |
Includes Melilotus alba (white sweetclover) and M. officinalis (yellow sweetclover), can be grazed as a forage crop, but mold or spoilage converts coumarins to toxic dicumarol, thus moldy hay or silage is dangerous |
[5] |
Nerium oleander |
Oleander |
Also known as rose laurel, adelfa, or rosenlorbeer |
[3][16] |
Nicotiana |
Tobacco |
|
[17][15] |
Onoclea sensibilis |
Sensitive fern or meadow fern |
|
[8][15] |
Oxytropis |
Locoweed or crazy weed |
Contains Swainsonine |
[4][16][15] |
Persea americana |
Avocado |
|
[26][15] |
Physalis |
Japanese lanterns, groundcherries |
|
[4][5] |
Phytolacca americana |
Pokeweed |
|
[4] |
Prunus |
Cherries, apricots, peaches, and plums |
|
[4][15] |
Pteridium esculentum/P. aquilinum |
Bracken fern |
|
[4][10][16] |
Quercus |
Oaks |
|
[1][15] |
Ranunculus |
Buttercups |
|
[10] |
Raphanus raphanistrum |
Wild radish |
|
[5][15] |
Rhododendron |
Azaleas, laurels, and rose bays |
|
[16][15] |
Ricinus communis |
Castor bean |
Also known as palma Christi, fatal even in small amounts |
[3][16] |
Robinia pseudoacacia |
Black locust |
Also known as false acacia |
[3][4] |
Romulea |
|
Known poisonous species include Romulea longifolia (Guildford grass) and R. rosea (onion grass or onion weed) |
[10][22] |
Rudbeckia laciniata |
Goldenglow, coneflower, or thimbleweed |
|
[8] |
Senecio |
Ragworts, groundsel, or stinking willy |
|
[4][10] |
Silybum marianum |
Variegated thistle |
Poisons cattle, sheep, and rarely horses |
[10] |
Solanum |
Potatoes, tomatoes, nightshades, horse nettle, ground cherry, or Jerusalem cherry |
|
[3][4][15] |
Solidago |
Goldenrod |
|
[8] |
Sorghum |
Sudan grass, Johnson grass |
Cyanide produced after stress |
[4][10][16] |
Stachys arvensis |
Field woundwort or stagger weed |
|
[27] |
Stipa viridula |
Sleepy grass |
|
[8] |
Swainsona |
Darling peas |
|
[10] |
Taraxacum officinale |
Dandelion |
When infected with a toxic mold that grows on it, the plant has been linked to outbreaks of Australian stringhalt. |
[23] |
Taxus |
Yews |
|
[16] |
Trifolium pratense |
Red clover |
|
[3] |
Vinca major |
Blue periwinkle or large periwinkle |
|
[10] |
Wislizenia refracta |
Jackass clover |
|
[8] |
Xanthium strumarium |
Cocklebur |
|
[5] |
Zephyranthes atamasca |
Atamasco lily or rain lily |
|
[8] |