Trianthema
Trianthema, Sp. Pl.: 223. 1753 sec. Hartmann 20171
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The genus belongs to Sesuvioideae and comprises about 28 species in two monophyletic clades, T. subg. Trianthema and T. subg. Papularia (Bohley & al. 2015). The latter has been revised by Hartmann & al. (2011). Nearly all species are C4 plants, an exception is the C3 species T. ceratosepala Volkens & Irmsch.