Heterotheca oregona

Heterotheca oregona is a species of flowering plant in the daisy family known by the common name Oregon false goldenaster. It is native to the west coast of Canada and the United States in British Columbia, Washington, Oregon, and California as far south as Los Angeles County.[2][3][4]

Heterotheca oregona

Apparently Secure  (NatureServe)
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Astereae
Genus:
Heterotheca
Species:
H. oregona
Binomial name
Heterotheca oregona
(Nutt.) Shinners 1951
Synonyms[1]
  • Ammodia oregona Nutt. 1841
  • Chrysopsis oregona (Nutt.) A.Gray
  • Chrysopsis rudis (ex Greene) Greene, syn of var., rudis

Heterotheca oregona is found in low-elevation mountain forests and chaparral, often near water. This is a perennial herb which is variable in appearance, with four somewhat indistinct varieties. It reaches a maximum height of 20 centimeters (8 inches) to one meter (40 inches), and is covered in small bristles. The inflorescence contains 1-15 flower heads in a flat-topped array. Each head has 14-60 yellowish disc florets but no ray florets. The fruit is an achene with a long grayish pappus.[5]

Varieties[1][5][3]
  • Heterotheca oregona var. compacta (D.D.Keck) Semple from Monterey County to Siskiyou County
  • Heterotheca oregona var. oregona - Washington, Oregon, California as far south as Monterey County
  • Heterotheca oregona var. rudis (Greene) Semple - Oregon, California as far south as San Benito County and Amador County
  • Heterotheca oregona var. scaberrima (A.Gray) Semple from Glenn County to San Luis Obispo County

References
  1. The Plant List, Heterotheca oregona (Nutt.) Shinners
  2. Biota of North America Program 2014 county distribution map
  3. Calflora taxon report, University of California, Heterotheca oregona (Nutt.) Shinn., Oregon false goldenaster, Oregon golden aster
  4. Turner Photographics, Heterotheca villosa - Wildflowers of the Pacific Northwest photos, description, partial distribution map
  5. Flora of North America, Heterotheca oregona (Nuttall) Shinners, 1951. Oregon goldenaster


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