Four new taxa of grasses are described: Diplachne amboensis Roiv. n. sp., D. amboensis var. plurinodis Roiv. n. var., Diplachne Wahlbergii Roiv. n. sp. and Megaloprotachne glabrescens Roiv. n. sp. The diagnostic characters of a number of taxa belonging to the multiform complex of Diplachne fusca (L.) P. Beauv. are discussed, and some additions are presented to the original description of Megaloprotachne albescens C. E. Hubbard.