Alveolae of the proximal exine are smaller and less regular in form than those at equatorial region.

近极区的穴较之赤道区的要小且形状较不规则。

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Except for some differences in exine ornamentation and pollen size, there is no great evolutionary divergence among genera in pollen morphology.

总体来讲，花粉没有大的演化分异，只是表面纹饰和花粉大小有一定的差异。

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Method: Pollen exine ultrastructure were compared for 18 populations growing under in the same environment by means of scanning electron microscope (SEM).

方法：借助扫描电镜对栽培在同一生境下的18个半夏居群的花粉形态、大小及表面纹饰等特征进行观测比较。

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Method: Pollen exine ultrastructure were compared for 18 populations growing under in the same environment by means of scanning electron microscope (SEM).

方法：借助扫描电镜对栽培在同一生境下的18个半夏居群的花粉形态、大小及表面纹饰等特征进行观测比较。

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