Heterotheca subaxillaris

Heterotheca subaxillaris
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Astereae
Genus: Heterotheca
Species: H. subaxillaris
Binomial name
Heterotheca subaxillaris
(Lam.) Britton & Rusby 1887
Synonyms[1]

Heterotheca subaxillaris, camphorweed,[2] is a North American species of flowering plant in the aster family, common name .[3] It is widespread across much of the United States (from California to Massachusetts) as well as Mexico and Belize.[4][5]

Heterotheca subaxillaris is a perennial, aromatic herb up to 203 centimeters (80 inches or 6 2/3 feet) in height, often with several erect stems. The stems are hairy to bristly. The inflorescence contains 3-180 flower heads in a flat-topped array. Each head contains 15–35; yellow ray florets surrounding 25–60 disc florets at the center.[6]

Chemistry

The leaf volatiles from which the name "camphorweed" is derived include camphor, but as a minor constituent (less than 2%); of 41 documented volatiles, for example, caryophyllene, pinene, borneol, myrcene, and limonene each comprised over 5% of the total.[7]

References

  1. ↑ The Plant List, Heterotheca subaxillaris (Lam.) Britton & Rusby
  2. ↑ "Heterotheca subaxillaris". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 21 July 2015.
  3. ↑ Discover Life, Heterotheca subaxillaris (Lam. ) Britton &. Rusby, camphorweed
  4. ↑ SEINet, Southwestern Biodiversity, Arizona chapter photos, description, partial distribution map
  5. ↑ Biota of North America Program 2014 county distribution map
  6. ↑ Flora of North America, Heterotheca subaxillaris (Lamarck) Britton & Rusby, 1887.
  7. ↑ Lincoln, D.E., B.M. Lawrence. 1984. The volatile constituents of camphorweed, Heterotheca subaxillaris. Phytochemistry 23(4):933-934



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