ABSTRACT:

Five new Homalomena species are described from Sarawak, Malaysian Borneo: H. baangongensis L.S.Tung & Y.C.Hoe, H. gastrofructa S.Y.Wong, Y.C.Hoe & P.C.Boyce, H. ibanorum S.Y.Wong & P.C.Boyce, H. passa S.Y.Wong & P.C.Boyce, and H. velutipedunculata S.Y.Wong, Y.C.Hoe & P.C.Boyce. Based on morphological characteristics they are assigned to the Giamensis Complex [H. baangongensis], Hanneae Complex [H. gastrofructa, H. velutipedunculata], and Borneensis Complex [H. ibanorum] of the Cyrtocladon Supergroup, and to the Selaburensis Complex [H. passa] of the Homalomena Supergroup. Keys to informal taxa of Bornean Homalomena, and to the species of the above mentioned species complexes are provided. All described novelties are illustrated from living plants, and a comparative plate of the spadix of the five described species of the Borneensis Complex is provided.