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The plants of Tribe Lecantheae of Urticaceae in Taiwan are moisture-loving annuals, perennial herbs or subshrubs in shady places. According to this study, the Tribe in Taiwan consists of five genera with 32 species and one variety. The genera are Pilea Lindley, Lecanthus Wedd., Procris Juss., Pellionia Gaudich., and Elatostema Forster & Forster f. Pilea consists of 13 species and one variety. One of the species is a new one and named Pilea elliptifolia Shih & Yang. One species Pilea pumila (L.) A. Gray is newly recorded in Taiwan. Pilea wattersii Hance is excluded from the genus, and transfered to Boehmeria Jacq. of this family. Lecanthus and Procris consist of only one species for each. Pellionia consists of two species. Elatostema consists of 15 species, 9 of them are new species, namely, Elatostema acuteserrata Shih & Yang, Elatostema hirtellipedunculata Shih & Yang, Elatostema hypoglauca Shih & Yang, Elatostema multicanaliculata Shih & Yang, Elatostema platyphylloides Shih & Yang, Elatostema rivularis Shih & Yang, Elatostema subcoriacea Shih & Yang, Elatostema strigillosa Shih & Yang, and Elatostema villosa Shih & Yang. Each genus of the tribe is given at least one line- drawing for convenient diagnosis. Each new species is given a diagnosis, protologue in Latin, and line-drawing. Holotypes of new species are deposited in the Herbarium of National Sun Yat- Sen University. A newly recorded species is also given a line- drawing. Each species in the study is described in detail. The genera of this Tribe can be distinguished with combinations of the characters: the different features among the inflorescence structures, leaf arrangements.
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