terpenes, sesquiterpene lactones
Flower Color:
  • flower color

Geographical Distribution

Pingue distribution - United States

Related Species


Hymenoxys spp

Bitterweed, Rubberweed
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Pingue (Hymenoxys spp) are members of the Asteraceae (sunflower) family which are native to North and South America. There are over 30 different species of Hymenoxys, which can be annuals or perennials, with erect, branching stems and yellow ray, 3-lobed flower on the heads. The species most commonly involved in poisoning cases of livestock include Bitterweed, Hymenoxys odorata and Cloradop rubberweed, H. richardsonii .

Toxic Components
All parts of Hymenoxys plants contain several sesquiterpene lactones, which are toxic to horses, goats, sheep and other animals which ingest them. Highest concentrations of the toxins are present in young, growing plants.