unisexual

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

开辐射对称，单或，，周位，上位或；

(，雌株植株，雌株或很少)单或，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;