花被是花萼和花冠的总称，位于雄蕊和雌蕊的外围，作为引诱昆虫来为花传粉和保护昆虫传粉采蜜的工具，根据各种植物的花的不同构造，可以分为：

1. 两被花—具有明显的花萼和花冠，并有显着的区别，例如桃、紫荆等；
2. 单被花—花萼和花冠合而为一，无法区别开；
   • 萼状花被：单被花的花被绿色，类似花萼，例如大麻；
   • 冠状花被：单被花的花被彩色，类似花冠，例如荞麦；
3. 无被花—没有花萼和花冠，一般都是风媒花，如柳树、小麦等。

The perianth (sometimes called perigonium or perigon) is the non-reproductive part of the flower, and structure that forms an envelope surrounding the sexual organs, consisting of the calyx (sepals) and the corolla (petals). The term perianth is derived from the Greek περί, peri, meaning around, and άνθος, anthos, meaning flower, while perigonium is derived from gonos, meaning seed, i.e. sexual organs. In the mosses and liverworts (Marchantiophyta), the perianth is the sterile tubelike tissue that surrounds the female reproductive structure (or developing sporophyte).