Two new species of Praravinia (Rubiaceae) from Borneo, P. longicalyx Koizumi & Nagam. and P. nitida Koizumi & Nagam., are described and illustrated. Characters of the fruit of P. subtomentosa Bremek. are described for the first time. A new combination, Urophyllum oresitrophum (Bremek.) Koizumi & Nagam. based on P. oresitropha Bremek., is proposed and the original description is amended. A revised key to the Bornean species of Praravinia is provided.
2016 The Japanese Society for Plant Systematics