Eucommia ulmoides Oliv.

Japanese: トチュウ(杜仲) - トチュウ（英語表記）Eucommia ulmoides Oliv.

A deciduous tree of the Eucommia family found in the mountains of central mainland China, which can reach a height of 20 m (illustration). It is sometimes planted in botanical gardens in Japan as well. The leaves are alternate, with petioles 1.5-2.5 cm long and leaf blades 6-18 cm long, 3-8 cm wide, elliptical to oval, and finely serrated edges. Dioecious. Flowers appear in large numbers in a scattered pattern at the base of young branches around April. There is no perianth, and male flowers have 4-10 stamens and female flowers have one pistil. The fruit is a flattened, elliptical samara 3-3.5 cm long containing a single seed surrounded by wings.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

中国大陸中部の山地に分布するトチュウ科の落葉高木で，高さ20mになる（イラスト）。日本でも植物園などに植えられていることがある。葉は互生し，葉柄は1.5～2.5cm，葉身は長さ6～18cm，幅3～8cmの楕円形～卵形で，縁に細かい鋸歯がある。雌雄異株。花は4月ごろ，若枝の基部に散形状に多数生じる。花被はなく，雄花は4～10本のおしべ，雌花は1本のめしべからなる。果実は1個の種子の周囲を翼でかこまれた長さ3～3.5cmの扁平，楕円形の翼果。

出典　株式会社平凡社世界大百科事典第２版について　情報

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