杯状聚伞花序

An inflorescence consisting of a cuplike cluster of modified leaves enclosing a female flower and several male flowers, as in the poinsettia.

花序外观似一朵花，外面围以杯状总苞，总苞具蜜腺，内含一朵无被雌花和多朵无被雄花，开放次序是雌花最早伸出开放，雄花开放由内到外为聚伞式开放，如大戟科泽漆属一品红。