The pollen grains of the genus are spheroidal, 8.9～ 9.7μm in diameter, usually -pores. The exine is -layers, .0～.μm in 本属花粉粒扁球形,大小为8.9～ 9.7μm,通常具 孔,外壁厚.0～.μm,两层,外层厚于内层或两层几等厚,表面具颗粒状、小刺状或条脊状纹饰。