Plant Poisoning of Horses: By Plant
Copyright 2003, Lippincott Williams & Wilkins
Alsike Clover & Klein grass (Trifolium hybridum & Panicum coloratum)
Arrow, Pod or Goose Grass
(Triglochin spp.)
Aster, White Prarie(Aster falcatus)
Aster, Woody
(Xylorrhiza glabriuscula)
Avocado (Persea americana)
Bracken Fern (Pteridium aquilinum)
Beard Tongue
(Penstemon spp.)
Black Walnut (Juglans nigra)
Broom, Turpentine, Snake or Match Weed (Guterrezia sarothrae)
Buckwheat (Fagopyrum esculentum)
Buttercups (Ranunculus spp.)
Castor Oil Plant (Ricinus communis)
Coffee Weed or Coffee Senna (Cassia occidentalis)
Death Camas (Zigadenus spp.)
Elderberry (Sambucus spp.)
Fiddleneck or Tarweed
(Amsinckia intermedia)
Field Bindweed (Morning Glory) (Convolvulus arvensis)
Foxglove (Digitalis purpurea)
Golden Weed (Haplopappus engelmannii)
Gumweed or Resinweed (Grindelia spp.)
Hemlock, Poison (Conium maculatum)
Hemlock, Water (Cicuta spp.)
Horse Chestnut and Buckeye
(Aesculus spp.)
Horsetail, Marestail, Horserush, or Snake Grass (Equisetum spp.)
Hounds tongue (Cynoglossum officinale)
Indian Paintbrush (Castilleja spp.)
Indigo (Indigofera spicata)
Jessamine, Day-Blooming or Wild (Cestrum diurnum)
Jimson Weed, Potato, and Tomato (Nightshade or Solanaceae)
Johnson and Sudan Grasses (Sorghum spp.)
Larkspur or Poison Weed (Delphinium spp.)
Locoweeds and Milkvetches
(Astragalus & Oxytropis spp.)
Milkweed (Asclepias spp.)
Monkshood (Aconitum spp.)
Mountain Laurel (Kalmia latifolia)
Oak (Quercus spp.)
Oleander (Nerium oleander)
Oleander, Yellow , Be-Still or Lucky Nut Tree (Thevetia spp.)
Onions (Allium spp.)
Pokeweed (Phytolacca americana)
Prince’s Plume
(Stanleya pinnata)
Rattlebox or Rattlepod (Crotalaria spp.)
Red Maple (Acer rubrum)
St. John’s Wort or Klamath Weed (Hypericum perforatum)
Sagebrush (Artemisia spp.)
Saltbush (Atriplex spp.)
Senecio species
Serviceberry or Saskatoon Berry (Amelanchier alnifolia)
Sorghum (Johnson & Sudan) Grasses
Spoiled Sweet Clover (Melilotus spp.)
Two-Grooved Milkvetches (Astragalus spp.)
Western Chokecherry (Prunus virginiana)
White Snakeroot and Crofton, Jimmyweed, and Burrow Weed (Eupatorium and Haplopappus spp.)
Wild Blue Flax (Linum spp.)
Yellow Star Thistle and Russian Knapweed (Centaurea spp.)
Yew (Taxus spp.)
The above information is from "Feeding and Care of the Horse", second edition, by Lon D. Lewis, Lippincott Williams & Wilkins, 1995. Reprinted with permission
from the publisher. It is as accurate as the information available allows. In some cases, the information on the effects of poisonous plants may be extrapolated
from reports on other species or limited reports on the horse. This section is provided to help horse owners identify and be able to eliminate potentially
toxic plants from their horses' environment. If a plant poisoning is suspected, horse owners should work closely with their veterinarian for diagnosis and
treatment of their horses' condition.
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