Leaves alternate or very strongly heterophyllous with 1 leaf of the pair reduced to a nanophyll very much smaller than the other, leaves usually distichous; leaf blade usually asymmetric.

• 上面花冠唇而不是具流苏的或锐裂；后唇瓣雄蕊而不是附着的在基部；无茎的草本；叶脉扇形；轮状聚伞花序在一紧密的具花葶的小头状花序或短穗状花序(9