Five new species and one new variety of Cryptocoryne (Araceae) from the Schwaner mountains (W Kalimantan) and the Müller mountains (W and C Kalimantan) are described. These new taxa makes a very interesting and unique addition to the genus Cryptocoryne. Two of the species have surprisingly low chromosome numbers: C. bastmeijeri with 2n = 14 and C. isae with 2n = 10. A key to the Cryptocoryne taxa of Borneo is provided.
Version of record first published online on 23 November 2017 ahead of inclusion in December 2017 issue.