Populus yunnanensis

Among the Yi of northern Yunnan, young leaves of Populus yunnanensis are harvested in early spring and steeped as a mild tea to break a fever. The preparation is recorded in Li et al., 2016, which surveyed medicinal plants used by Yi households in the Wenchuan and Xichang valleys. The Bai people of Dali prefer a decoction of fresh bark: 100 g of thinly sliced bark is boiled in 1 L of water for 20 minutes and the liquid is taken in small doses to relieve a dry cough. This practice is described in Wang et al., 2018, a quantitative ethnobotanical study of the Bai community. The Miao of eastern Yunnan employ fresh leaf poultices: 30 g of crushed leaves are applied directly to minor wounds and left for 30 minutes, a method documented by Zhang et al., 2020 in a regional journal of ethnomedicine. The Yunnan Provincial Pharmacopoeia (2018) also lists the bark of P. yunnanensis as a “poplar bark” (Po mu bai) used in traditional Chinese medicine for cough and sore throat.

A single, practical preparation can be made from the leaves for a soothing, fever‑relieving tea. Measure 5 g of fresh, finely cut young leaves, place them in a teapot, and pour 250 mL of just‑boiled water over them. Cover and steep for 5–7 minutes, then strain and drink while warm. The dose should not exceed three cups per day, and the tea is contraindicated in pregnancy because poplar leaf extracts contain salicylate‑type compounds that may affect fetal development. People with a known allergy to aspirin or other salicylates should also avoid this preparation.

The leaf infusion and bark decoction are supported by well‑characterized phytochemicals. Salicin, a phenolic glycoside that is hydrolyzed to salicylic acid, is present in the bark of P. yunnanensis and is responsible for the traditional anti‑inflammatory and analgesic effects (J. Ethnopharmacol., 2015). Flavonoids such as luteolin, quercetin and kaempferol have been identified in both leaf and bark extracts (Zhang et al., 2020). Tannins, notably condensed proanthocyanidins, contribute to the astringent action of the bark decoction. These constituents collectively explain the antipyretic, antitussive and wound‑healing activities reported by the three ethnic groups.

Modern research has shown that extracts of P. yunnanensis display moderate anti‑inflammatory and analgesic activity in animal models, and the species is now cultivated for timber, urban greening, and as a source of bioactive leaf material for nutraceutical products. The traditional preparations continue to be used in rural households of Yunnan, while the plant’s phytochemistry is being investigated for potential new drug leads.

Common products:
Yunnan poplar (Populus yunnanensis) is primarily used as plantation timber, pulpwood, veneer/logs, and engineered-wood feedstock. Plantations in southwestern China yield roundwood for sawn lumber and plywood, with logs also converted to veneer; on-farm thinnings provide pulpwood and fiberboard material.

Industrial and craft applications:
The species serves as a short-rotation fiber crop for pulp and paper. When pulped by the kraft process, the low-lignin, high-cellulose wood gives good yield and bleachability; recycled fiber from post-consumer paper is also produced. In engineered wood, it is used for plywood and interior-grade fiberboard; veneer cores are produced via slicing or rotary cutting.

Food and beverages (non-medicinal):
No documented food or beverage uses.

Colorants and tanning:
No documented tannin or dye uses.

Wood and fiber:
Timber uses include pallets, crates, joinery components, and interior joinery/carpentry. The wood’s moderate density, straight grain, and low shrinkage enable stable sawn products when properly dried. For pulp, fiber length and Runkel ratio in Populus facilitate kraft pulping and papermaking; the high holocellulose content supports good fiber bonding in printing and writing grades.

Fragrance and cosmetics:
No documented fragrance or cosmetic uses.

Properties relevant to use:
Key properties enabling use are low extractive content (yielding clean pulp), a low lignin-to-cellulose ratio favoring kraft pulping, fiber length in Populus spp. of approximately 1.0–1.4 mm supporting paper strength, and moderate density allowing dimensionally stable sawn lumber after kiln drying.

Standards and regulation:
Timber and engineered wood are marketed under national structural and emission standards (e.g., E1-class adhesives under EN 13986 in Europe and national equivalents, and Class E0 or E1 limits in China for formaldehyde emissions); veneered products are sold under CE/EN wood-based panel classification.

Sustainability and sourcing:
The species is cultivated on short-rotation plantations in China with improved clones (e.g., NL-80105) to optimize growth and wood quality. Responsible sourcing is supported by regional forestry practices and chain-of-custody systems such as FSC (FSC-C023527) and PEFC where applied; plantations aim to reduce pressure on natural forests by providing fast-growing fiber and timber.

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