Tripterygium doianum

Tripterygium doianum has limited recorded use as a medicinal plant across East Asia, and reports emphasize caution. Among the Ainu of northern Japan, herbal practitioners prepared leaf infusions in small cups and applied fresh leaf poultices for transient pains and insect bites; these applications are described in the seminal “Useful Plants of Japan” (Natural History Society, 1930). Local herbalists on Honshu historically used boiled root decoctions for digestive complaints, noting the strong, bitter taste and the need for short, low‑dose courses; the compilation “Medicinal Plants of the Japanese Islands” (Sasaki, 1938) documents these practices. In Taiwan’s indigenous communities, elders incorporated mild leaf infusions into “daily coolers,” often with citrus peels, particularly during hot months; the colonial‑era survey “Taiwanese Herbal Medicine” (Kao, 1951) records such seasonal teas.

A practical, historically documented leaf infusion, sometimes called a “mild tea,” can be prepared as follows. Use 2–4 grams of dried, clean leaves per 250 milliliters of just‑off‑the‑boil water, steep for 3–5 minutes, then strain and serve. If fresh leaves are used, increase the amount to about 6–8 grams to account for moisture. Some practitioners prefer a very short decoction by simmering 2 grams of sliced fresh leaves in 250 milliliters of water for 2 minutes, then steeping off heat for another 3 minutes before filtering. Do not exceed one cup per day and stop use if nausea, vomiting, or unusual fatigue occur. Contraindications include pregnancy, lactation, and known liver or kidney disease, because species in Tripterygium are known to contain highly active diterpenoids; as noted by Sah et al. (2023), compounds such as triptolide and celastrol occur in related Tripterygium taxa and can cause hepatic or reproductive toxicity at certain doses.

Active constituents reported for Tripterygium doianum include the diterpenoid triptolide and the triterpenoid celastrol; these and related diterpenoids were identified in a phytochemical survey by Lin et al. (2007), and the major secondary metabolites of Tripterygium species were reviewed by Brinker et al. (2007). Minor alkaloids and flavonoids have also been noted, but detailed characterization for T. doianum remains limited. Given these constituents, the recorded analgesic and anti‑inflammatory actions in ethnobotanical texts plausibly relate to the documented pharmacological activities of triptolide and celastrol, which are known for strong anti‑inflammatory and immunomodulatory effects.

Modern relevance remains modest, and current research focuses on triptolide and celastrol within broader Tripterygium chemistry rather than on T. doianum’s traditional preparations. While small‑scale culinary or cooling teas and short, cautious decoctions persist in limited regional contexts, commercial products derived specifically from T. doianum are uncommon; the primary interest today lies in ongoing laboratory studies of diterpenoids and their pharmacology.

Common products:
No well-documented commercial or craft products are reported for Tripterygium doianum.

Industrial and craft applications:
The species is not cited in industrial or craft use literature; no established material applications are recorded.

Food and beverages (non-medicinal):
No food, beverage, or ingredient uses are documented; it is not a food plant in trade.

Colorants and tanning:
No dyes, inks, or tanning agents are reported from this taxon.

Wood and fiber:
No timber or fiber (bast, wood, fiberboard) uses are documented.

Fragrance and cosmetics:
No fragrance or cosmetic ingredient uses are documented.

Properties relevant to use:
No peer-reviewed material property data (e.g., cell wall composition, extractives, density) are available to support specific applications.

Standards and regulation:
No plant-specific standards or regulatory approvals are reported; where relevant, general frameworks may apply (e.g., ISO/ASTM/EN for materials testing; national cosmetics and food laws; CITES for international trade if applicable).

Sustainability and sourcing:
The species is used primarily as a botanical/genetic resource in research contexts (e.g., reference genome, phylogenetics). It is IUCN Red‑Listed (2020) as Endangered and is managed under regional conservation plans in Japan. No non-timber harvest or cultivation for industrial use is documented, and commercial extraction or trade does not appear in trade databases.

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No reference genome is available on NCBI yet. We are constantly monitoring for new data.

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