Platycarya

...A deciduous tree of the walnut family that grows in sunny, slightly dry areas (illustration). It is also known as Nobu-noki and Doku-gurumi. The leaves are odd-pinnate and alternate. The leaflets have narrow, pointed tips and sharp sawtooth edges. The bases of the lateral leaflets are highly asymmetrical. The flowers bloom around June, and after the leaves unfold, numerous catkins gather at the tips of the new branches. At the bottom are male inflorescences, which are yellowish-green and long and slender, rising obliquely. The female inflorescences are at the tips, and usually the base is female, but the upper half is dominated by male flowers. The flowers have no perianth, and the male flowers have stamens lined up in the bract axils, while the female flowers have wing-like bracts and fused pistils in the bract axils. ...

*Some of the terminology explanations that mention "Platycarya" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…日当りのよいやや乾いた地に生えるクルミ科の落葉小高木（イラスト）。ノブノキ，ドクグルミの名もある。葉は奇数羽状複葉で互生する。小葉は先端が細くとがり，鋭い鋸歯がある。側小葉の基部は著しく不相称となる。花は6月ころ咲き，葉が展開した後に，新枝の先端に多数の尾状花序が集まる。下の方には雄花序があり，黄緑色で細長く斜上する。雌の花序は先端にあり，通常，基部は雌花であるが，上半部は雄花が占める。花は花被がなく，雄花では苞腋（ほうえき）におしべが並び，雌花では苞腋に翼状の小苞と合着しためしべがある。…

※「Platycarya」について言及している用語解説の一部を掲載しています。

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