Abstract: According to the difference of fruits, the genus Gynostemma Bl. was divided into two subgenera: Suben. Gynostemma and Subgen. Triostellum. This paper reports chromosome num-bers of 8 species and 1 variety including 20 populations of this genus. Among them, 4 species and 1 variety are the first reported. Chromosome numbers are usually 2n=22, 33, 44, 66, and 88, the two subgenera have the same basic chromosome number: x= 11. Polyploids are frequent in several species, and triploid and diploid individuals of G. pentaphyllum var. dasycarpum were observed in the same population. The polyploidy is usually related to the morphological feature, reproduction and geographic distribution. Some species with diploid are distributed in small regions, such as G. microspermum, G. laxifiorum, G. guangxiense and G. pentagynum, and polyploids are usually ob-served in some species, such as G. cardiospermum, G. longipes, G. yixingerse and G. pentaphyllum, distributed in larger regions.

Key words: Gynostemma

摘要： 报道了葫芦科绞股蓝属(Gynostemma B1.)8种共20个居群的染色体数目，分别为2n=22，33，44，66，88，多倍体现象极为普遍。两个亚属；绞股蓝亚属(Subgen．Gynostemma)和喙果藤亚属(Subgen．Triostellum)的染色体基数均为x=11，并结合该属植物形态特征、繁殖方式和地理分布，对普遍出现的多倍体现象进行了讨论。

关键词: 绞股蓝属, 染色体, 多倍体