Abstract: the present paper is a meterial of the genus Hemsleya Cogn. for flora of China-Cucurbitaceae. The genus Hemsleya was established by C. A. Cogniaux in 1889. By 1982 about 7 species had been discovered in China, and most of them are mainly distributed in S. W. China, particularly in Yunnan and Sichuan. Their tubers have been used as a folk medicine for a long time. However, we began to search for them, and meanwhile collect and cultivate them, only about ten years ago. After a general survey and taxonomical study, 20 species of Hemsleya are recorded from Yunnan in the paper. Among them 18 species and 3 varieties are new. All the types are kept in Herb. KUN. According to the characters, of corolla and fruit also the seed condition, widely or narrowly winged, proposed are four sections, namely: Sect. I. Craciliflorae; Sect. II. Amabiles; Sect. III. Carnosiflorae and Sect. IV. Hemsleya, among which 3 are new.

Key words: Hemsleya, new sp.