List of plants poisonous to equines
Poisonous plants
Table:
Scientific name	Common name	Notes	References

Abrus precatorius	Crab's eye	Also known as precatory bean, rosary pea, or jequirity bean

Acer rubrum	Red maple, also known as swamp or soft maple	Toxic compounds are gallic acid and tannins.

Adonis microcarpa	Pheasant's eye	Often found in hay.

Aesculus hippocastanum	Horse chestnut	Also known as buckeye

Ageratina	Snakeroots	Known poisonous species include Ageratina adenophora (Crofton weed, causes Tallebudgera horse disease) and Ageratina altissima (white snakeroot)

Aleurites	Tung oil tree

Amsinckia intermedia	Fiddleneck	Contains pyrrolizidine alkaloids

Apocynum cannabinum	Hemp dogbane	Also known as Indian hemp, choctaw root, rheumatism weed, and snake’s milk

Arctotheca calendula	Cape weed

Armoracia lapathifolia	Horseradish

Artemisia	Known poisonous species include Artemisia tridentata (big sagebrush) and Artemisia filifolia (sand sagebrush)

Asclepias syriaca	Common milkweed

Astragalus	Locoweed, crazy weed, or milk vetch	Contains Swainsonine

Atropa belladonna	Deadly nightshade or belladonna

Baptisia	False indigo

Berteroa incana	Hoary alyssum

Brassica	Mustards

Buxus sempervirens	Boxwood

Celastrus scandens	Climbing bittersweet

Centaurea	Thistles	Known poisonous species include Centaurea solstitialis (yellow star thistle or St. Barnaby's thistle) and Centaurea repens (Russian knapweed)

Cestrum parqui	Green cestrum

Chrysothamnus nauseosus	Rubber rabbitbrush

Cicuta	Water hemlock, cowsbane

Claviceps paspali	Paspalum ergot

Conium maculatum	Hemlock or poison hemlock

Corydalis	Fitweed, fumitory

Craspedia chrysantha	Round billy button or woollyhead

Crotalaria	Rattlepods

Cucumis myriocarpus	Paddy melon

Cuscuta	Dodder

Cynoglossum officinale	Houndstongue

Datura	Jimsonweed, thorn-apple

Delphinium	Larkspur

Dendrocnide moroides	Stinging tree or Gympie stinger

Descurainia pinnata	Tansy mustard

Digitalis	Foxgloves

Dryopteris filix-mas	Male fern

Duboisia	Corkwoods

Echium plantagineum	Paterson's curse	Also known as Salvation Jane, blue weed and Lady Campbell weed

Equisetum	Horsetails, mare's tails, scouring rush

Erythrophleum chlorostachys	Cooktown ironwood

Euphorbia	Spurges

Festuca arundinacea	Tall fescue

Franseria discolor	White ragweed

Glechoma hederacea	Ground ivy	Also known as creeping charlie

Grindelia	Gumweeds

Haplopappus heterophyllus	Rayless goldenweed	Also known as jimmyweed or burrow weed

Heliotropium	Heliotropes	Known poisonous species include Heliotropium amplexicaule (blue heliotrope), H. europaeum (common heliotrope), and H. supinum (creeping heliotrope)

Homeria	Cape tulips

Hypericum perforatum	St. John's wort	Also known as Klamath weed

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

Juglans nigra	Black walnut	Bedding horses in shavings or sawdust can cause laminitis

Juniperus virginiana	Juniper

Kalmia latifolia	Mountain laurel or spoonwood	Also known as spoonwood or calico bush

Kochia scoparia	Burning bush	Also known as summer cypress or Mexican firewood

Lantana camara	Yellow sage

Ligustrum	Privets

Lolium perenne	Perennial ryegrass

Lupinus	Lupins

Lychee	Lychee	Ingesting large amounts almost certainly caused the death of four horses

Malva parviflora	Mallow

Marsilea drummondii	Nardoo	Contains an enzyme which destroys vitamin B1, leading to brain damage in sheep and horses

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

Nerium oleander	Oleander	Also known as rose laurel, adelfa, or rosenlorbeer

Nicotiana	Tobacco

Onoclea sensibilis	Sensitive fern or meadow fern

Oxytropis	Locoweed or crazy weed	Contains Swainsonine

Persea americana	Avocado

Physalis	Japanese lanterns, groundcherries

Phytolacca americana	Pokeweed

Prunus	Cherries, apricots, peaches, and plums

Pteridium esculentum/P. aquilinum	Bracken fern

Quercus	Oaks

Ranunculus	Buttercups

Raphanus	Radishes

Rhododendron	Azaleas, laurels, and rose bays

Ricinus communis	Castor bean	Also known as palma Christi, fatal even in small amounts

Robinia pseudoacacia	Black locust	Also known as false acacia

Romulea	Known poisonous species include Romulea longifolia (Guildford grass) and R. rosea (onion grass or onion weed)

Rudbeckia laciniata	Goldenglow, coneflower, or thimbleweed

Senecio	Ragworts, groundsel, or stinking willy

Silybum marianum	Variegated thistle	Poisons cattle, sheep, and rarely horses

Solanum	Potatoes, tomatoes, nightshades, horse nettle, ground cherry, or Jerusalem cherry

Solidago	Goldenrod

Sorghum	Sudan grass, Johnson grass	Cyanide produced after stress

Stachys arvensis	Field woundwort or stagger weed

Stipa viridula	Sleepy grass

Swainsona	Darling peas

Taraxacum officinale	Dandelion	When infected with a toxic mold that grows on it, the plant has been linked to outbreaks of Australian stringhalt.

Taxus	Yews

Trifolium pratense	Red clover

Vinca major	Blue periwinkle or large periwinkle

Wislizenia refracta	Jackass clover

Xanthium strumarium	Cocklebur

Zephyranthes atamasca	Atamasco lily or rain lily

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