Abstract: Pollen morphology of 18 taxa of Porana s.l. was examined under light microscope(LM) and scanning electron microscope(SEM). Except 7 species and 1 variety, the rest are reported for the first time. The results showed that four types of pollen grains are recognized in Porana s.l. according to the size, shape, ornamentation and characteristics of colpate membranes:(1)subspheroidal of spheroidal (p/E=1.00-1.05), 11.6-15.4×11.4-15.0 um,microspinulose-foveolate or microspinulose-perforate, 3-colpate, coarsely granulate of tuberculate inside the colpi.

Key words: Porana s.l.

摘要： 对广义飞蛾藤属Porana s.l. 18个分类群的花粉进行了光学显微镜和扫描电镜观察。除前人报道过的7种1变种外，其余均为首次报道。根据花粉粒的大小、形状、外壁纹饰、沟膜特征，该属花粉可细分为4个类型。研究结果不支持Staples(1993)把该属分为4个独立属的观点，而认为在属内划分为4个亚属较为合理。除毛果飞蛾藤外, 花粉形态支持Staples对其它种、变种的归并。从花粉萌发孔类型上看，广义飞蛾藤属在旋花科内应处于较为原始的位置。

关键词: 广义飞蛾藤属, 花粉形态, 旋花科