Abstract: Lamboos with monopodial rhizomes occur chiefly in China. They have a wide range of distribution from Yellow River valley southward to the mountains in South China. Some of them still remain unknown.While studying on Chinese bamboo classification, the authors found some new species. In this paper, six new bamboo species collected from Guangxi Autonomous Region and Sichuan Province, are described and discussed taxonomically. These bamboos belong to three different genera and are named as Arundinaria spongiosa sp. nov. (Chinese name "Dou zhu"), Arundinaria maculosa sp. nov, ( "Baiyan zhu" ), Sasa guangxiensis sp. nov. ( "Guangxi chizhu" ), Sasa tomentosa sp. nov.( "Rongmao chizhu"), Chimonobambusa angustifolia sp. nov. ("Xiaye fangzhu") and Chimono-bambusa hejiangensis sp. nov. ("Hejiang fangzhu") respectively. Illustrations of the above species are also given.In addition, we have also combined two species of Arundinaria into Indocalamus based on morphological differences.