Pedicellarum is subsumed into Pothos as Pothos paiei. Four species, three taxonomically novel (Pothos degenerans, ecclesiae and P. fractiflexus) and one pre-existing (Pothos oliganthus) are discussed. The reproductive structures are reinterpreted and floral terminology used in this paper is in line with paving the way to interpreting the ‘inflorescence’ of Pothos, and indeed of all other aroids, as a unique array of structures that are neither flowers nor inflorescences as defined by current prevailing orthodoxy, but something of both.

Homalomena portae-inferni is described and illustrated as a new species of the Chamaecladon Clade with scintillating-velutinous foliage restricted to lowland kerangas, and compared with the three morphologically most similar species on Borneo, and with the single other Chamaecladon species described from the Tawau Hills National Park.

One hundred and fourteen species belonging to 29 genera of Araceae are recorded from Sabah: Aglaonema Schott, Alocasia (Schott) G.Don, Amorphophallus Blume ex Decne., Amydrium Schott, Anadendrum Schott, Arisaema Mart., Bucephalandra Schott, Colobogynium Schott, Colocasia Schott, Cryptocoryne Fisch. ex Wydler, Cyrtosperma Griff., Epipremnum Schott, Gamogyne N.E.Br., Homalomena Schott, Lasia Lour., Lemna L., Nabalu S.Y.Wong & P.C.Boyce, Ooia S.Y.Wong & P.C.Boyce, Phymatarum M.Hotta, Pistia L., Pothos L., Rhaphidophora Hassk., Pursegloveia S.Y.Wong, S.L.Low & P.C.Boyce, Rhynchopyle Engl., Schismatoglottis Zoll. & Moritzi, Scindapsus Schott, Spirodela Schleid., Tawaia S.Y.Wong, S.L.Low & P.C.Boyce, Typhonium Schott, and Wolffia Horkel ex Schleid. Two genera, Cryptocoryne and Phymatarum, are newly recorded from Sabah. One species, Pothos leptostachyus Schott, is newly recorded from Sabah. One genus, Tawaia, and 50 species are endemic to Sabah. Taxonomic notes, an identification key to genera, and comments on habitat and ecology of the species are presented.