Three new species of Elatostema (Urticaceae) from Thailand

Three new species of (Urticaceae) from Thailand, Triyutth. & L.F.Fu, , Triyutth. & L.F.Fu, and Triyutth. & L.F.Fu, , are newly described and illustrated. These new species can be distinguished by the presence of rhizome. is similar to . is a lithophyte growing in limestone crevices. It differs from by its large swollen rhizome, glabrous stem, glabrous receptacle, number of tepal in staminate flower, absence of tepal in pistillate flower, presence of staminodes in pistillate flower and smooth achene. and are found on sandstone habitats. They have distinct flattened and disk-like rhizome. is distinguished by its distinct sulcate and reddish stem with flattened and disc-like rhizome and chartaceous leaves with entire margin. resembles but differs by its flattened and disc-like rhizome, acute leaf apex, glabrous receptacle in pistillate inflorescences, presence of staminodes in pistillate flower, and its sandstone habitat. Descriptions, distribution, ecological and phenological data are provided.