Ageratina occidentalis

Ageratina occidentalis
Regional Parks Botanic Garden
Berkeley, California
Scientific classification
Kingdom:Plantae
Clade:Angiosperms
Clade:Eudicots
Clade:Asterids
Order:Asterales
Family:Asteraceae
Genus:Ageratina
Species: A. occidentalis
Binomial name
Ageratina occidentalis
Synonyms[1]
  • Eupatorium occidentale Hook.
  • Eupatorium berlandieri A.Gray
  • Eupatorium oregonum Nutt.
  • Kyrstenia occidentalis (Hook.) Greene

Ageratina occidentalis is a species of flowering plant in the daisy family known by the common name western snakeroot or western eupatorium.[2] It is native to the western United States where it grows in several types of habitat. It is found in California, Oregon, Washington, Idaho, Montana, Nevada, and Utah.[3]

Ageratina occidentalis is a rhizomatous perennial herb growing fuzzy green or purple stems to a maximum height near 70 centimeters. The glandular leaves are triangular with serrated edges. The inflorescence is a dense cluster of fuzzy flower heads containing long, protruding disc florets in shades of white, pink, and blue. There are no ray florets. The fruit is an achene a few millimeters long with a rough, bristly pappus.[4]

References

  1. ↑ "Ageratina occidentalis (Hook.) R.M.King & H.Rob.". The Global Compositae Checklist (GCC) – via The Plant List.
  2. ↑ Nesom, Guy L. (2006). "Ageratina occidentalis". In Flora of North America Editorial Committee. Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  3. ↑ "Ageratina occidentalis". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  4. ↑ Keil, David J.; Powell, A. Michael (1993). "Ageratina occidentalis". In Hickman, James C. The Jepson Manual: Higher Plants of California. University and Jepson Herbaria.


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