umbel:- نظام ازهرار تكون فيه الأزهار على شكل مظلة مقلوبة أي أنها تكون محمولة على أعناق تنمو كلها من نقطة واحدة (المعجم الموحد لمصطلحات علم الأحياء)
umbel:- flat-topped or rounded inflorescence characteristic of the family Umbelliferae in which the individual flower stalks arise from about the same point; youngest flowers are at the center (Princeton WordNet 3.1)
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