Rayless Goldenrod

Scientific Name: Haplopappus heterophyllus
Family: Asteraceae
Toxicity: Toxic to Horses
Toxic Principles: Trematol
Clinical Signs: Plant is toxic year round, although poisonings typically occur in summer and late fall. Horses eating one to ten percent of their body weight in the plant can develop lethal clinical effects. Onset of signs generally occurs after two days to three weeks, and includes incoordination, muscle weakness and tremors, elevated heart rate, cardiac arrhythmias, fluid accumulation and swelling of the nervous system, profuse sweating, inability to swallow.

If your pet ingested this plant, contact your local veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435.*

* A $65 consultation fee may apply.

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