Cymes are a type of flower cluster where the main stem ends in a flower, and the side branches develop flowers that bloom sequentially. This growth pattern allows the central flower to open first, followed by the surrounding flowers. Cymes can be found in various plant families, including Euphorbiaceae and Rubiaceae. There are two main types of cymes: biflorous cymes, which have two flowers at the end of the stem, and multiflorous cymes, which have multiple flowers. The arrangement of flowers in cymes can vary, leading to different shapes and sizes, making them an interesting feature in many flowering plants.