Abstract: One species of the genus Pellionia and two species of the genus Elatostema(Urticaceae) are described as new from Simian Shan, Jiangjin Qu, Chongqing Shi: (1)Pellionia simianshanica is related to P.ronganensis W.T.Wang & Y.G.Wei, differing from the latter in its fewer secondary nerves of leaves, 2 shortly corniculate tepals of pistillate flower, and its oblong achenes; (2)Elatostema oligotrichum is possibly related to E.nasutum Hook. f., differing from the latter in its smoller leaves, carinate pistillate involucral bracts and staminate and pistillate bracteols, and its stigma consisting of only 3 or 4 hairs; (3)Elatostema simianshanicum is related to E.longicuspe W.T.Wang & Y.G.Wei, differing from the latter in its puberulous stem apex, shorter peduncles of staminate capitula, and its linear-navicular and carinate staminate involucral bracts.

Key words: Urticaceae, Pellionia, Elatostema, new species, Chongqing