Flowers usually of 2 kinds , open or cleistogamous .

通常开花2种，营业或者。

Petals usually longer than sepals ( but sometimes smaller , cleistogamous flowers present ) , apex emarginate or shallowly bifid or toothed .

花瓣通常长比萼片(但是有时小，闭花受精花宿存)，先端微缺或浅2裂或齿。

Flowers bisexual , zygomorphic , solitary , often dimorphic ( cleistogamous flowers later than chasmogamous ones ) ; pedicels axillary , 2-bracteolate .

花两性，左右对称，单生，通常二形(闭花授精花比开花受精的晚)；腋生的花梗，具2小苞片。