Details

Common Name
Orange Sneezeweed
Botanic Name
Dugaldia hoopesii (Helenium hoopesii)
Plant Family
Asteraceae
Habitat
Sneezeweed grows at altitudes of 5,000-10,000 feet in moist but well drained soils of mountain meadows and aspen groves.
Animals Affected
Sheep especially, but cattle and horses are susceptible to poisoning. Goats seem tolerate much more of the plant before being affected.
Orange sneezeweed (Dugaldia hoopesii)
Toxic Principle
Dugaldin (hymenovin), a sesquiterpene lactone, is highly irritating to the mucous membranes of the respiratory and digestive tracts causing sneezing and projectile vomiting. The toxic dose is 0.3-1.0% body weight of the green plant. If eaten in large quautity death may result in a 1-2 days. More commonly, small amounts of the plant are eaten over time which leads to the more typical digestive signs seen
Description
Perennials growing to 2 1/2 feet in height, with numerous broad clasping leaves near the base of the stem. Multiple flowers are large and showy with 3-5 toothed orange/yellow petals up to 2 inches in length.
Gastrointestinal
Decreased appetite, bloating, teeth grinding and rumen stasis may be seen initially. Projectible vomiting of rumen contents leading to dehydration, weight loss, weakness and inhalation pneumonia. A common name for the disease is 'Spewing sickness'
Musculoskeletal
Muscle weakness, ataxia, especially in lambs causing them to lag behind the flock.
Treatment
Remove animals from the source of the sneezeweed and provide nutritious food and water.
Respiratory System
Inhalation pneumonia
Diagnosis
Sheep with projectile vomiting grazing orange sneezeweed.
Special Notes
Overgrazing mountain rangeland leads to orange sneeze weed proliferation. Reference: 1. Ivie GW et al. Isolation of Hymenovin from Hymenoxys richardsonii (Pingue) and Dugaldia hoopesii (Orange Sneezeweed). J Aric Food Chem 24:680-682, 1976.
Orange sneezeweed (Dugaldia hoopesii)
Orange sneezeweed flowers.
Orange sneezeweed