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  2. 柠檬 - 官方网站

    柠檬

    原产亚洲的常绿小乔木
    柠檬为芸香科柑橘属的一种,是原产于亚洲的常绿小乔木,其果实为黄色椭圆状。 常绿灌木或小乔木。枝上少刺或近于无刺。叶卵形或椭圆形,厚纸质,具线形叶翼,长8-14厘米,宽4-6厘米,顶部通常短尖,边缘有明显钝裂齿;嫩叶及花芽为紫红色。花单生或少量簇生或组成总状花序;花萼杯状,4-5浅齿裂;花瓣长1.5-2厘米,外面淡紫红色,内面白色;略有香味;常有单性花,即雄蕊发育,雌蕊退化;雄蕊20-25枚或更多;子房近筒状或桶状,顶部略狭,柱头头状。果实为椭圆形或卵形的柑果,两端狭,顶部通常较狭长并有突尖;果皮厚,黄色,通常粗糙,有蜡质光泽,难剥离,富含柠檬香气的油点;果肉极酸;瓢囊8-11瓣,汁胞淡黄色,果汁酸至甚酸。种子小,卵形,端尖;种皮平滑,子叶乳白色,通常单或兼有多胚。花期4-5月,果期9-11月。
     
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