伞形花序(Umbel)为一种花序,属于无限花序(Indeterminate inflorescence)[1][2],由从一点上发出的许多花梗组成,其形状有如伞骨。此一称呼可追溯至1590年,来自拉丁文的umbella,意指遮阳用的伞[3] 。伞形花序中,花梗末端有可能再分支出数个次级花梗,而自成一独立的伞形结构(umbellules, umbellets)[4],此种花序称为复伞形花序(compound umbels)[1]。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Inflorescences_Umbel_Kwiatostan_Baldach.svg/320px-Inflorescences_Umbel_Kwiatostan_Baldach.svg.png)
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Inflorescences_Umbel_Kwiatostan_BaldachZ%C5%82o%C5%BCony.svg/320px-Inflorescences_Umbel_Kwiatostan_BaldachZ%C5%82o%C5%BCony.svg.png)
复伞形花序是伞形科植物(包括香芹、香菜、胡萝卜等)的特征[5],另外五加科的常春藤属、楤木属、八角金盘属[6],以及石蒜科的葱属等类群的花序亦为伞形花序[7]。
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