Calyx actinomorphic, 5-sect from base or 5-lobed, segments equal or unequal; disc ringlike, inconspicuous or absent; capsule 2(or 4)-valved.

• 花萼辐射对称，5个教派的自基部或5浅裂，裂片等长或不等长；花盘环形，不明显的或无；蒴果2(或4)裂。(32