Trifoliate orange (English name: trifoliate orange)

Japanese: カラタチ(枸橘) - カラタチ（英語表記）trifoliate orange

A deciduous shrub or small tree of the Rutaceae family with one genus and one species that is food for swallowtail butterflies. It has thorns on the branches and is widely used as a hedge in warm regions. The branches are green, flat, and angular, with thick thorns 1-7 cm long. The leathery leaves are alternate and trifoliate. The petioles are 1-3 cm long and winged. The leaflets are ovate to elliptical or obovate, 2.5-6 cm long, with rounded tips, slightly concave apexes, wedge-shaped bases, and no or blunt sawtooth edges. In spring, yellowish-white flowers 3.5-5 cm in diameter appear on the branches of the previous year before the leaves appear, but soon turn yellow.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

アゲハチョウの食草になる1属1種のミカン科の落葉低木または小高木。枝にとげがあり，生垣として暖地で広く利用される。枝は緑色扁平で稜角があり，長さ1～7cmの太いとげがある。革質の葉は互生し，3出。葉柄は長さ1～3cmで翼がある。小葉は卵形から楕円形あるいは倒卵形で長さ2.5～6cm，先端は円く頂端は少しへこみ，基部はくさび形，ふちには鋸歯がないか，または鈍鋸歯を有する。春，葉に先だって前年枝に径3.5～5cmの黄白色の花をつけるが，やがて黄色をおびる。

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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