Chengiopanax sciadophylloides is a flowering tree in the family Araliaceae native to Japan. Previously included in the genus Eleutherococcus, it is distinguished from other members of that genus by not having spines or prickles and ITS sequence data confirmed the separation.
Chengiopanax sciadophylloides has been found to be a specific hyperaccumulator of manganese even in soils not contaminated with excessive amounts of manganese. In wild plants concentrations of up to 23 grams of manganese per kilogram of dried leaf have been analyzed. After the Fukushima Daiichi nuclear disaster in March 2011 it was found that Chengiopanax sciadophylloides accumulated the radioactive isotope 137Cs to concentrations above the human consumption guideline of 100 becquerels per kilogram of fresh weight even as far away as Nagano and Iwate Prefectures. Analysis of leaves taken from Chengiopanax sciadophylloides in August and October 2013 from a forest 37 kilometres northwest of the Fukushima Dai-ichi Nuclear Power Plant found a mean concentration of 28,100 becquerels per kilogram of dry weight, over 3 times those of other trees. They also accumulated the non-radioactive 133Cs more than other trees.
Known as koshiabura (コシアブラ), gonzetsu and gonzetsunoki in Japanese cuisine, it is foraged in the wild in Spring for the young leaves as sansai ("mountain vegetables"). Called the "queen of sansai". Often used in tempura but popular in a range of dishes. The highest grade of buds is as small as a calligraphy brush and so named fude ha ("leaf of brush").
A lacquer-like coating material called kinshitsu (金漆) used to be made from the sap. The polyacetylenes in the plant sap were polymerised by sunlight to produce the hard resin varnish. Two other members of the Araliaceae, Dendropanax trifidus and Gamblea innovans, may also have been sources for this lacquer in Japan. The lacquer was used to prevent corrosion of suits of armour and helmets, with related species providing a similar lacquer used in China during the T'ang dynasty and in Korea.
The wood is used for general construction and for chopsticks. The wood is regarded as auspicious and is valued in the Sasano-Bori doll carving tradition in Yonezawa (along with the wood of the Pagoda Tree) for its strength and flexibility.
- The Plant List, Chengiopanax sciadophylloides (Franch. & Sav.) C.B.Shang & J.Y.Huang
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- Terada, Akira; Tanoue, Yasuhiro; Kishimoto, Daishiro (1989). "(−)-(9Z)-1,9-Heptadecadiene-4,6-diyn-3-ol as a Principal Component of the Resinous Sap of Evodiopanax innovans Nakai, Japanese Name, Takanotsume, and Its Role in an Ancient Golden Varnish of Japan". Bulletin of the Chemical Society of Japan. 62 (9): 2977–2980. doi:10.1246/bcsj.62.2977.
- "Wooden Carving". Takumi Traditional Japanese Dolls & Gifts. TLT Co. Ltd. Retrieved 28 May 2017.
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