Ageratina altissima, White Sanicle, Richweed, Tail Boneset
Perennial with smooth stems. Leaves are egg-shaped with teeth and grow opposite. Flowers are small, white and grow in loose clusters.
High due to extreme toxicity.
Leaves, stems and flowers
Occur between a few minutes and a few weeks of ingestion, lack of coordination, weakness, tremors, rapid pulse, jaundice, cardiac arrhythmia’s, profuse sweating, inability to swallow, troubled breathing, sudden death.
Contains Trematol, a toxin which can be passed on through the milk of nursing mares. Can be fatal.
*It should be noted that we are not veterinarians. This information is written specifically for horses and should be used for reference purposes only. If you think your horse has eaten something toxic call your vet right away.