Novelties in Fissistigma (Annonaceae) from Borneo.

Five new species of are described from Borneo. sp. nov. is a species of lowland and hill forest mostly recorded from Sabah. sp. nov. is similar to (Miq.) Merr. of the Malay Peninsula and Sumatra. sp. nov. is from Mount Kinabalu. is a robust plant known from a couple of collections from Sarawak. sp. nov. is a species from hill and montane forest recorded from Brunei, Sabah and Sarawak. A new combination in is made for Diels. Two recently described species of from Borneo ( Irawan and Irawan) are reduced to synonymy of (Miq.) Steenis and (Hook. f. & Thomson) D. Das, respectively. Both species of are lectotypified.