unisexual

Flowers radially symmetric, bisexual or unisexual, hypogynous, perigynous, or epigynous;

开花辐射对称，，，周位，上位；

(，雌雄异株植株，雌花花异株很少)花，雄不相等5瓣；

Inflorescences corymbiform-umbellate, many flowered, bracteate.Flowers bisexual or unisexual (plants hermaphroditic, dioecious, or rarely gynodioecious), male ones unequally 5-merous;