Snakeroot, White (Epatorium rugosum)


(Eupatorium rugosum)

Deerweed, Deerwort, Deerwort-boneset, Fall Poison, Hemp-agrimony, Indian Sanicle, Milk-sickness Plant, Richweed, Squaw-weed, Stevia, Tremeto, Tall Boneset, White Sanicle, White Snakeroot or  White Top 


White-SnakerootWhite Snakeroot plant and Flowers

The single upright stalks can grow to be roughly 2 -3  feet tall perennial herb with showy clusters of small bright-white flowers white. The flower heads are easily spotted in the fields, meadows, along road sides, lake edges, waste areas, stream banks, and woods. The leaves are opposite each other, roughly 2 1/2 to 7 inches in long and slender and come to a sharp point, are coarsely-toothed and rounded at their base.  The flower heads are about 1/4 inch wide and contains between 8 to 30 bright-white disk flowers. The Numerous flower heads are grouped into loosely-branched, flat-topped clusters arising from the upper leaves. Each flower head is about 1/4 inch wide and contains between 8 to 30 bright-white disk flowers. The roots are fibrous in nature, heavily branched knotty and tough. A single seed is contained with each black or brown fruit. The cigar-shaped seed is about 1/16 in. in length  and tipped with a tuft of white hairs

Snakeroot native to North America and is abundant throughout the south of Canada and the eastern half of the United States.

Conditions of Poisoning:
Ingestion, Skin contact

Toxic Principle:
Due to an unstable, fat-soluble alcohol called tremetol, which has a phenyl nucleus and an incompletely characterized resin acid poisoning is possible. Tremetol is an aromatic, oily, straw-colored liquid. The principal ketone, tremetone, is also suspected to be toxic.

Clinical Symptoms:
Trembling, especially of the flank and hind legs; slow, lethargic or sluggish behavior (“the slows”); stiffness in movement or ataxia; coma; and death. Horses seem less prone to trembling. Livestock may exhibit constipation, nausea, vomiting, slobbering, loss of appetite, or labored or rapid breathing. An acetone odor on the breath may result from ketosis in severely poisoned animals. Postmortem: gross and histological lesions: fatty degenerative changes in liver and kidney; heart and gastrointestinal hemorrhages. One leaf can kill a child.


 Lone Star English Setter Club provides this information
as a partial reference of the potential poisons that could harm your dog.
We are not veterinarian’s and DO NOT provide medical help.

 If you think that your animal is ill or may have ingested a poisonous substance,
contact your local veterinarian or
the ASPCA’s 24-hour emergency poisoning hotline directly