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乔木。叶互生；羽状脉。花单生或几朵集成总状花序，腋生或与叶对生，通常两性花，有时单性花；萼片3，圆形或宽卵形；花瓣6片，2轮，镊合状排列，外轮花瓣大于内轮花瓣，外轮花瓣卵形或倒卵形， [[ 薄膜质 ]] ，有脉纹，内轮花瓣箭头形或铁铲形，基部有长爪，上部卵形或[[披针形]]，向内弯拱而边缘稍粘合呈圆球状；雄蕊多数，长圆状楔形，药室外向，分离，药隔顶端截形；心皮通常多数，长圆形，花柱长圆形或棒状，少数花柱极短或不明显，腹部有槽纹，每心皮有胚珠4至多颗，2排。成熟心皮圆球状或卵圆状，有时长圆状椭圆形，有柄或近无柄。