1. Stipules distinct or connate, often persistent. 托叶离生或合生，经常宿存。
2. Corolla lobes 3, green or colored, basally connate into a tube and adnate to staminodes. 花冠裂片3，绿色或者鲜艳的颜色，基部合生成管，与退化雄蕊贴生。
3. Petals 5, connate at base into a very short tube, apex free, valvate, in pistillate flowers early deciduous or absent. 花瓣5，在基部合生进一短筒部，先端离生，镊合状的，在雌花里较早些时候的落叶的或无。
