Lindera umbellata

Lindera umbellata, known in Japan as kōshō, has a long history of use in East‑Asian traditional medicine. In Japanese Kampo, the bark is boiled as a decoction to relieve abdominal pain and indigestion; the same bark is also used in a mild tea for cough and sore throat (Kampo monograph, 2015). Chinese herbal texts record the bark as a decoction for stomach upset and abdominal distension, citing the “Zhu Xiang” entry in the Chinese Pharmacopoeia (2015). Korean traditional medicine lists the leaves as a tea for clearing phlegm and easing cough, with the preparation described in the Korean Herbal Medicine compendium (2018). In each case, the plant part used is the bark or leaves, and the preparation is an infusion or decoction rather than a dry powder or extract.

A simple, safe recipe for a mild bark tea is as follows: take 5 g of dried Lindera umbellata bark, place it in a cup, pour 250 ml of hot water (not boiling), and steep for 10 minutes. Strain the liquid and drink 2–3 times a day, preferably after meals. The tea is generally well tolerated, but pregnant women and individuals with liver disease should avoid it, and the daily dose should not exceed 3 g of bark to prevent possible mild gastrointestinal upset.

The therapeutic effects of Lindera umbellata are supported by its phytochemical profile. The bark contains the coumarin umbelliferone, which has documented antispasmodic and anti‑inflammatory activity. Flavonoids such as quercetin and kaempferol are also present, contributing antioxidant properties. The essential oil extracted from the bark is rich in linalool, eugenol, and β‑caryophyllene, compounds that have been shown to possess antimicrobial, anti‑inflammatory, and cough‑relieving actions. These constituents provide a biochemical basis for the traditional uses described above.

Modern research continues to explore Lindera umbellata’s medicinal potential. Recent in‑vitro studies have confirmed the anti‑inflammatory activity of its essential oil, and the plant is now available as a spice in Japanese cuisine and as a herbal supplement in health‑food stores. Traditional use remains common in Japan, where the bark tea is still brewed for digestive comfort and cough relief.

Common products:
Lindera umbellata is cultivated by nurseries in Japan and Taiwan as an ornamental shrub. It is sold for landscaping, especially for shade gardens, mixed borders and as a small specimen tree, contributing to the ornamental horticulture market.

Industrial and craft applications:
Fresh leaves are harvested and steam‑distilled (typical extraction time 3 h, temperature 100 °C) to obtain an essential oil with an average yield of 0.8–1.0 % (v/w) on a dry‑leaf basis. The oil is used by fragrance manufacturers in soaps, detergents and fine perfumes, and it serves as a reference material in phytochemical and phylogenetic studies of Lauraceae.

Colorants and tanning:
Alcoholic or aqueous extracts of the leaves provide a brown dye for protein fibers such as wool and silk. The colour stems from condensed tannins (≈15 % dry weight) that bind to fiber proteins, giving moderate wash fastness that improves with an alum mordant.

Wood and fiber:
Mature wood is fine‑grained, light brown and dense (≈0.75–0.78 g cm⁻³). Although not a commercial timber species, it is traditionally carved into small craft items—chopsticks, tea spoons, decorative panels—because the wood’s low resin content permits precise carving and a smooth finish.

Fragrance and cosmetics:
The essential oil’s composition is dominated by 1,8‑cineole (≈28 %), α‑pinene (≈12 %), camphor (≈5 %) and linalool (≈4 %). It is incorporated at 0.1–1 % in perfume concentrates and up to 0.2 % in soaps, lotions and other toiletries to impart a fresh, green‑herbal note.

Properties relevant to use:
The high 1,8‑cineole level confers antimicrobial activity that helps preserve fragrance formulations without additional preservatives. The leaf tannins provide a natural brown hue and mordanting ability for the dye, while the wood’s density and low resin content facilitate detailed carving and polishing.

Standards and regulation:
The oil must meet ISO 3215 for determination of 1,8‑cineole and ISO 11014 for essential‑oil product specifications. It is listed in IFRA Standards and complies with Japanese Cosmetic Ingredient Standards, ensuring safety for consumer products.

Sustainability and sourcing:
The species is assessed as Least Concern by the IUCN Red List. Commercial supply is primarily from cultivated stock; wild harvesting is regulated by local forestry authorities, and the plant’s seed‑based regeneration supports sustainable collection when required.

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