French lavender
StarLavandula dentata
Synonyms: Lavandula dentata var. vulgaris, Stoechas dentata
Western Herbalism Properties
Gallery
Botanical Description
Lavandula dentata, known as French or fringed lavender, is an evergreen aromatic shrub of the Lamiaceae family, native to the Mediterranean basin (Spain, the Balearic Islands, North Africa) and parts of the Arabian Peninsula. Plants form rounded bushes 60 to 100 centimetres tall and as broad, with slender woody stems that are square in cross-section and clothed in soft greyish-green foliage. The leaves are distinctive within the genus: opposite, narrowly linear-oblong, 2 to 4 centimetres long, with conspicuous rounded teeth along the margins (hence 'dentata'), and densely covered in short greyish hairs that release a pleasant rosemary-lavender fragrance when crushed. Flowering spikes are terminal, dense and short, 3 to 5 centimetres long, topped with a tuft of pale violet-purple sterile bracts; the small two-lipped flowers are pale lavender. Calyces and bracts are densely glandular-pubescent. It is widely grown ornamentally and harvested for essential oil.
Active Constituents
Linalool
Acyclic monoterpene alcoholConcentration: ~45% of the essential oil (dominant constituent)
Linalool is the principal constituent of L. dentata oil and carries much of its sedative, anxiolytic, analgesic and antimicrobial activity; it is a mild skin sensitiser once oxidised.
Camphor
Bicyclic monoterpene ketoneConcentration: ~16% of the essential oil
The relatively high camphor content distinguishes L. dentata from true lavender (L. angustifolia). Camphor is counterirritant and antimicrobial but is neurotoxic in overdose and is the reason the oil should not be ingested or used on infants or people with epilepsy.
1,8-Cineole (eucalyptol)
Monoterpene oxideConcentration: ~7% of the essential oil
1,8-Cineole gives the herb its eucalyptus/rosemary-like note and contributes expectorant, anti-inflammatory and antimicrobial activity.
Borneol
Bicyclic monoterpene alcoholConcentration: ~8% of the essential oil
Borneol is antimicrobial and anti-inflammatory and adds a camphoraceous, penetrating aroma.
γ-Terpineol
Monoterpene alcoholConcentration: ~7% of the essential oil
Terpineol contributes antimicrobial activity and a soft floral-lilac odour.
Linalyl acetate
Monoterpene esterConcentration: ~6% of the essential oil (much lower than in L. angustifolia)
Linalyl acetate is the sweet, fruity ester prized in fine lavender oil; its comparatively low level in L. dentata makes this species more herbaceous and camphoraceous and less suited to perfumery.
Thymol and phenolic/flavonoid fraction
Monoterpene phenols and polyphenolsConcentration: Thymol ~1-2%; rosmarinic acid and flavonoids in aqueous/alcoholic extracts
Thymol adds antimicrobial activity, while rosmarinic acid and flavonoids in polar extracts account for much of the plant's antioxidant capacity.
⚠ Drug Interactions
CNS depressants (benzodiazepines, sedatives, alcohol)
Linalool and linalyl acetate have documented sedative/anxiolytic activity in the Lavandula genus, so combined use with sedatives could theoretically add to drowsiness. This is extrapolated from lavender generally rather than shown specifically for L. dentata.
Clinical note: Relevant mainly to concentrated oral or aromatherapy use; no documented clinical interactions for L. dentata specifically.
Preparation Methods
Essential oil (steam-distilled, for aromatherapy/topical use)
Parts: Flowering tops, Leaf
The oil is distilled from the flowering aerial parts and used diluted (typically 1-3% in a carrier oil) for massage and inhalation. Because of its high camphor content it should not be taken internally, should be kept away from infants and young children, and is best avoided by people with epilepsy and during pregnancy.
Infusion / herbal tea
Parts: Flowers, Leaf
A light infusion of the dried flowers and toothed leaves is used traditionally in North Africa and Iberia as a calming, digestive and mildly antiseptic drink.
Dried herb and hydrosol (topical / cosmetic)
Parts: Flowering tops
Dried flowering tops are used in sachets and washes, and the distillation water (hydrosol) is applied as a gentle antiseptic skin tonic. Patch testing is advisable, as oxidised linalool can cause contact sensitisation.
Clinical Studies
Lavandula dentata L.: Phytochemical Analysis, Antioxidant, Antifungal and Insecticidal Activities of Its Essential Oil
GC-MS analysis of Moroccan L. dentata oil identified sixteen compounds dominated by linalool (45.06%), camphor (15.62%), borneol (8.28%) and 1,8-cineole (7.24%). The oil showed concentration-dependent DPPH antioxidant activity, marked antifungal activity against phytopathogenic fungi, and insecticidal activity, supporting its documented antimicrobial/biopesticidal potential.
Historical Texts
North African and Andalusian traditional medicine
Medieval to presentClassical Greco-Roman lavender tradition (Dioscorides, 'stoechas')
1st century CE onwardReferences
- El Abdali Y, Agour A, Allali A, et al.. Lavandula dentata L.: Phytochemical Analysis, Antioxidant, Antifungal and Insecticidal Activities of Its Essential Oil . Plants (Basel) 11(3):311 (2022) [DOI]
- Batiha GE, Teibo JO, Wasef L, et al.. A review of the bioactive components and pharmacological properties of Lavandula species . Naunyn-Schmiedeberg's Archives of Pharmacology 396:877-900 (2023) [DOI]
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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