Spanning the temperate and subtropical forests of East Asia, Picrasma ailanthoides grows as a deciduous tree celebrated for its medicinal properties and bitter wood. This resilient species plays a significant role in traditional Asian pharmacopoeias and forest ecology.
It is commonly found along forest margins, valley slopes, and riverbanks. The tree is particularly noted for its high concentrations of bitter quassinoids, which protect it from pests.
The physical characteristics of this tree allow it to thrive in diverse East Asian climates. Its distinct foliage and bark serve as key identifiers in the wild.
Late spring to early summer, typically from May to June
The dried stems and bark have long been utilized in traditional medicine across China, Japan, and Korea to treat fever, gastrointestinal infections, and skin disorders. Its bitter compounds are also extracted to formulate natural, eco-friendly insecticides and pest repellents.
In landscaping, the tree is occasionally grown for its attractive autumn foliage and ornamental fruits. Its hard, close-grained wood is also used for carving and making small utensils.
The Japanese name for this tree is nigaki, which translates literally to bitter wood. It is so bitter that even a tiny fragment held in the mouth produces a long-lasting, intense bitterness.
In autumn, the compound leaves turn a brilliant shade of yellow, making it a prominent feature of the deciduous forest canopy. The species is highly resistant to air pollution, which has spurred interest in its suitability for urban forestry.
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