Awadan (English name) Melicope triphylla (Lam.) Merr.

Japanese: アワダン（英語表記）Melicope triphylla (Lam.) Merr.

An evergreen tree of the Rutaceae family, the northernmost distribution of which is in the Ryukyu Islands, that grows to a height of about 5 m (illustration). The twigs are grayish white with slightly flattened nodes. The plant is entirely hairless. The leaves are opposite and trifoliate. The leaflets are obovate-oblanceolate or oblong-oblanceolate, papery, 8-9 cm long, and lack sawtooth edges. They have 2-4 cm long petioles. In Okinawa, small white flowers grow in axillary, bifurcated panicles 3-5 cm long in summer. The sepals are about 1 mm long, the petals about 3 mm long, and there are eight stamens. The fruit is a capsule divided into four, each obliquely ovate and about 5 mm long.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

琉球諸島が分布の北限となるミカン科の常緑小高木で，高さ5mくらいとなる（イラスト）。小枝は灰白色で節部はやや扁平。全体に毛がない。葉は対生し，3出。小葉は倒卵状倒披針形または長楕円状倒披針形，紙質で長さ8～9cm，縁に鋸歯はない。長さ2～4cmの葉柄がある。沖縄では夏，長さ3～5cmの腋生（えきせい）の岐散状円錐花序に小さい白色の花をつける。萼片は長さ約1mm。花弁は長さ約3mm。おしべは8本。果実は袋果で四つに分かれ，各分果は斜倒卵形で長さ約5mm。

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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