Abstract
The New Zealand species of Deyeuxia and Lachnagrostis are delimited; three new species and two new subspecies of Lachnagrostis are described, one variety in Lachnagrostis is raised to specific rank, one new combination at specific rank is made in Lachnagrostis, and two species are transferred from Deyeuxia to Lachnagrostis. The generic separation of Southern Hemisphere Deyeuxia and Australasian Lachnagrostis is discussed, and a brief comparison is given of these two genera with Northern Hemisphere Calamagrostis.

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