An umbel is a type of flat-topped flower cluster in which the individual flowers are borne on short stalks that all arise from a common point at the top of the stem. A corymb is another type of flat-topped flower cluster in which the individual flowers are borne on stalks of different lengths, with the longest stalks at the bottom and the shortest at the top. Lastly, a cyme is a type of flat-topped flower cluster in which the individual flowers are borne on stalks of equal length, with the oldest flowers at the center and the youngest at the periphery.