1.Anthers sessile, circular, 2-loculed, introrse, connate into a synandrium, dehiscence longitudinal.

1.花药，，2室，内向，合生的成为聚药，开纵向。

2.Anthers 6, opposite perianth segments, attached at lobe sinus, lobelet sinus, or lobe apex of corona, dorsifixed, introrse.

2.花药6，对生于花被片，附片凹缺，小片凹缺，或副花冠片先端的，背，内向。