Plant Family
Monimiaceae
A southern aromatic family in the laurel order — boldo's family, running on aporphine alkaloids and a toxic essential oil.
Aromatic evergreen shrubs and trees of the Southern Hemisphere, related to the laurels. Medicinally represented by boldo, whose leaf carries both a useful alkaloid and a hazardous oil.
5 Notable Members
Overview
The Boldo Family
Aromatic evergreen shrubs and small trees, opposite-leaved and leathery, distributed across the Southern Hemisphere — Chile, Australasia, Madagascar and the Pacific. They belong to the Laurales, the laurel order, and share that order’s habits: essential oils held in scattered secretory cells, and a strong tendency toward aporphine alkaloids.
The family’s single medicinal member of note is boldo, Peumus boldus, the only species in its genus and endemic to the Chilean matorral. Its leaves have been used since pre-Columbian times and are among Chile’s most widely exported botanicals.
Shared Traits
How to Recognise It
In Practice
Medical Significance
Boldo is a liver and bile herb, and that is essentially the family’s entire medical scope. Its alkaloid boldine is choleretic — it increases bile flow — and has genuinely good antioxidant credentials, being one of the more potent naturally occurring radical scavengers studied in vitro. On that basis boldo leaf is used for dyspepsia, sluggish digestion, gallbladder complaints and as a mild hepatoprotective.
The evidence does not match the reputation. Boldo is widely sold and confidently recommended, but the human data are thin: small studies of bile flow and gallbladder emptying, and very little else. The choleretic effect is reasonably established; the broader liver-tonic claims are not.
The gap between leaf and oil is the safety story. Boldo’s essential oil is 16–38% ascaridole, a peroxide monoterpene formerly used as an anthelmintic and abandoned because of its toxicity — neurotoxic and hepatotoxic in overdose. A water infusion of the leaf extracts relatively little ascaridole; the essential oil, and alcoholic extracts to a lesser degree, concentrate it.
This makes preparation a safety decision rather than a matter of preference. Boldo essential oil should not be taken internally at all. The leaf is contraindicated in pregnancy, in obstructive biliary disease and in liver disease, and is not appropriate for prolonged use.
Phytochemistry
Characteristic Chemistry
Aporphine alkaloids define the family’s pharmacology: boldine is the principal one, with isoboldine, isocorydine, laurotetanine and the biosynthetic precursor reticuline alongside it. The essential oil carries ascaridole, 1,8-cineole, p-cymene and limonene. Flavonoids and catechin are present as secondary antioxidants. The combination — a useful alkaloid alongside a hazardous monoterpene in the same leaf — is what makes extraction method decisive here.
Beyond the Database
Also in This Family
Notable members without a monograph yet.
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