Biennial wormwood
StarArtemisia biennis
Synonyms: Artemisia jacquinii, Artemisia inconspicua, Artemisia biennis var. diffusa, Artemisia australis, Artemisia pinnatifida
Western Herbalism Properties
Traditional Uses
The Cherokee employed Artemisia biennis for several complaints. The plant was used for menstrual cramps and painful menstruation, and as a general remedy for cramps and colic (Hamel and Chiltoskey, 1975). A preparation was also applied to sores and wounds as a dermatological aid (Hamel and Chiltoskey, 1975). Anthelmintic use is also recorded, with a poultice applied to the stomach and seeds taken in molasses for worms (Hamel and Chiltoskey, 1975). The Gosiute gathered the seeds as food (Chamberlin, 1911), and the Ramah Navajo used the plant ash in blackening ceremonies (Vestal, 1952).
Gallery
Botanical Description
Artemisia biennis, commonly called biennial wormwood, is an annual or biennial herb in the Asteraceae family, native to western North America and now widely naturalised across temperate regions. It typically grows 30 to 200 cm tall with a stout, erect, single stem that is glabrous and often reddish at the base, branching freely above. The leaves are deeply pinnately divided into narrow, sharply toothed lobes, bright green and aromatic when crushed, though less strongly scented than many other wormwoods. The inflorescence is a slender leafy panicle of numerous small, sessile, greenish-yellow flower heads arranged along the upper stems and in the leaf axils. Each head contains tiny disk florets only, with no ray florets. Flowering and fruiting occur from late summer to autumn. The achenes are minute and glabrous, lacking a pappus. It typically colonises moist, disturbed ground such as ditches, riverbanks, fields and roadsides.
Active Constituents
(Z)-Nerolidol
Oxygenated sesquiterpene alcohol (essential oil)Concentration: Dominant essential-oil component (reported ~23–54% depending on growth stage)
(Z)-Nerolidol is the principal volatile of Iranian-grown biennial wormwood and carries antimicrobial, antioxidant and cytotoxic activity; nerolidol-rich oil fractions showed the strongest anticancer effect in cell-line testing.
(E)-β-Farnesene
Sesquiterpene hydrocarbon (essential oil)Concentration: Major component; ~7–16% in Iranian material and reported around 40% in western Canadian material
(E)-β-Farnesene is a widespread insect-signalling sesquiterpene that contributes to the oil's aroma and to insect-repellent / antifeedant activity.
(Z)-Tonghaosu / (Z)-en-yn-dicycloether (dehydrofalcarinol-type polyacetylene)
Polyacetylene (essential oil)Concentration: Major component (~12–19% in Iranian material; ~11% reported in Canadian material)
This spiroacetal-enol-ether polyacetylene is characteristic of many Artemisia oils and contributes antimicrobial and cytotoxic activity.
(Z)-β-Ocimene
Monoterpene hydrocarbon (essential oil)Concentration: Major component of the western Canadian chemotype (~35%)
β-Ocimene is a common floral/green-note monoterpene contributing to aroma and to plant defence signalling; it dominates certain North American populations.
Phenolic acids and flavonoids
Phenolic compoundsConcentration: Concentrated in polar (ethyl-acetate / n-butanol) fractions of the aerial parts
The phenolic and flavonoid fraction accounts for most of the free-radical-scavenging antioxidant capacity reported for aerial-part extracts of this species.
Sesquiterpene lactones
TerpenoidsConcentration: Present in trace to minor amounts typical of Artemisia
Bitter sesquiterpene lactones contribute to the herb's traditional bitter/anthelmintic reputation and to the possibility of Asteraceae contact allergy.
Preparation Methods
Infusion of aerial parts (folk use)
Parts: aerial parts, leaves
Dried aerial parts have been steeped as a bitter infusion in folk practice as a digestive and anthelmintic. As with other wormwoods it is intensely bitter and should be used only briefly and in modest amounts; avoid in pregnancy and lactation.
Clinical Studies
Cytotoxic Activity and Phytochemical Analysis of Artemisia biennis Essential Oils at Different Growth Stages
Essential oils were analysed across growth stages, with (Z)-nerolidol, (E)-β-farnesene and (Z)-tonghaosu as the main constituents. The oil from plants collected in June showed the most potent cytotoxicity against MCF-7 breast (IC50 ≈ 2.84 µg/mL) and HT-29 colon (IC50 ≈ 2.41 µg/mL) cancer cell lines, indicating that growth stage strongly influences composition and anticancer activity.
References
- Jamshidi N, Mojarrab M, Delnavazi MR, Emami SA, Bahrami G, Shokoohinia Y, Hosseinzadeh L. Cytotoxic Activity and Phytochemical Analysis of Artemisia biennis Essential Oils at Different Growth Stages . Jundishapur Journal of Natural Pharmaceutical Products (2024) [DOI]
- Mojarrab M, Naderi R, Afshar FH. Total Phenolic Contents and Antioxidant Activities of Different Extracts and Fractions from the Aerial Parts of Artemisia biennis Willd . Iranian Journal of Pharmaceutical Research (2014)
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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