Pedicularis plicata

Among Tibetan herders of Qinghai, dried leaves of Pedicularis plicata are boiled in water for fifteen to twenty minutes to make a mild tea taken to lower fever and relieve cough (Zhou et al., 2015). Sherpa healers in Nepal simmer the whole plant—roots, stems and leaves—in water for about thirty minutes to produce a decoction used for stomach cramps and dysentery (Bajracharya, 2014). In Sichuan’s highlands, fresh leaves are steeped in hot water for eight to ten minutes and the infusion is drunk as a liver tonic (Wang et al., 2021). These traditions rely on hot‑water extracts of different plant parts to address fever, gastrointestinal and hepatic complaints.

Each tradition adapts the preparation to the material. Tibetan healers use younger leaves, which give a clearer liquor after a brisk boil; Sherpa practitioners favor the fibrous roots, requiring a longer simmer to release bitter compounds; Sichuan herb‑gatherers steep fresh leaves, which are more aromatic when boiled briefly. The decoction is strained and served warm, often sweetened with honey or yak butter to soften the astringent taste. No alcoholic tinctures or macerated poultices for P. plicata are reported; the people rely exclusively on water‑based infusions and decoctions.

One simple recipe for the leaf tea: place 5 g dried leaves in a teapot, pour 200 mL of boiling water, cover and steep ten minutes, then strain. The light‑amber liquor can be drunk warm two to three times a day. As a safety note, limit to three cups daily and avoid during pregnancy because iridoids may stimulate uterine muscle; children under twelve should have no more than half a cup, and those on anticoagulants should seek advice before use.

Phytochemical analyses of Pedicularis plicata have consistently identified iridoid glycosides such as aucubin and catalpol, phenylethanoid glycosides including verbascoside and acteoside, and flavonoids like quercetin and luteolin (Liu et al., 2020). These compounds possess documented anti‑inflammatory, antipyretic and mild choleretic actions that fit the traditional indications. Contemporary pharmacology confirms that extracts rich in aucubin reduce prostaglandin synthesis, while verbascoside modulates NF‑κB pathways, supporting the fever‑lowering and liver‑supporting claims. Today the leaf tea remains a staple in rural markets of western Sichuan and in high‑altitude villages of the Qinghai‑Tibetan plateau, and although commercial products are scarce, ongoing research into its bioactives promises new therapeutic applications.

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