Schismatoglottideae (Araceae) of Borneo LXXVII — Circumscribing Schismatoglottis sensu stricto, and seven new genera

Based on published molecular analyses combined with morphological data, the genus Schismatoglottis is restricted to species with hapaxanthic shoots and a caducous spathe limb shed almost always in a single piece. Thus defined, Schismatoglottis comprises sixty-nine accepted species, twenty-four provisionally accepted names, and three species of doubtful affinity [Schismatoglottis conoidea, S. convolvula, and S. priapica] that are retained provisionally in Schismatoglottis pending further study. Eight-five species hitherto assigned to Schismatoglottis with pleionanthic shoots and spathe limbs variously senescing are transferred into seven new genera: Aia (monotypic), Ayuantha (four species), Bau (26 species), Borneoa (22 species), Ibania (12 species), Sarawakia (five species), and Tweeddalea (15 species). All genera are illustrated, together with representative species of Schismatoglottis s.s., and a species-finder list provided as an Appendix. The changes presented here take the vascular plant Bornean flora to 1601 native genera.