山白树属雄蕊数目和形态的变异及其系统学意义？

该文利用扫描电镜法（SEM）研究了山白树属雄蕊的形态学特征，主要观察结果如下：多数情况下，雄蕊为5枚，其成熟花药有背腹之分，花药侧面纵向延伸的缝线在两端发生分叉；此外，还观察到4枚及6枚雄蕊的情况，有的雄蕊的花药在形态上没有背腹之分，呈四方柱状或扁平状，其侧面纵向延伸的缝线在两端不发生分又或者仅在基部的一侧发生分叉。研究结果，山白树属雄蕊在形态分化上处于不稳定的过渡阶段，表现出和“高等金缕梅类”的联系。

Variation of Stamen Number and Form Of Sinowilsonia and Its Systematic Significance

The morphological character of the stamen of sinowilsonia Hemsl.Was studied here,the main results are:The stamen number are five in the majority.The mature anther have dorsal and ventral side,and the longitudinal slit bifurcate at transverse direction.Besides these observations,we also observe the four and six stamens.Some anthers,which show cuboid or flat form,have no dorsal and ventral side and posess no stomial bifurcation or have bifurcation only at the proximal end.Based on this study,we consider that the stamen of sinowilsonia Hemsl.Is at transition stage of form differentiation and represent the relation with the"higher"hamarnelids.