Heterotheca lamarckii
| Heterotheca subaxillaris | |
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| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Astereae |
| Genus: | Heterotheca |
| Species: | H. subaxillaris |
| Binomial name | |
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Heterotheca subaxillaris (Lam.) Britton & Rusby 1887 |
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| Synonyms | |
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Synonymy
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Heterotheca subaxillaris, camphorweed, is a North American species of flowering plant in the aster family, common name . It is widespread across much of the United States (from California to Massachusetts) as well as Mexico and Belize.
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.
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.
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