Abstract: Abstract Pollen grains of Wightia and related genera of Bignoniaceae and Scrophulariaceae were examined under LM and SEM with an attempt to show how the genus Wightia correlates with the two families and therefore further determine its position systematically, and at the same time to clarify Chinese species within the genus Wightia. The result shows that the size, the character of aperture and the ratio of sexine to nexine of the pollen of Wightia are more similar to that of Scrophulari-aceae than to those of Bignoniaceae, for example the former two taxa have small to medium-sized, 3 -colporate or 2 - 4 colporate (or colpate) pollen grains withsexine equal to nexine.

Key words: Wightia

摘要： 本文通过光学显微镜和扫描电镜对岩梧桐属Wightia Wall.花粉进行了深入的观察，并与紫蔬科和玄参科部分属种作了详尽的比较。结果认为，从花粉的大小等级、萌发孔特征、外壁内外层比例等看，岩梧桐属花粉与玄参科的花粉更类似，而与紫葳科的相距较大。孢粉学支持把岩梧桐属置于玄参科。该属的国产种，根据花粉的大小和外壁纹饰特征的差异划分为两个种较为合理和自然，不该合并为一个种。

关键词: 岩梧桐属, 紫葳科, 玄参科, 花粉形态