Heterotheca subaxillaris

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

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 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]

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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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