A Revision of Triodia including Plectrachne (Poaceae, Eragrostideae, Triodiinae)

Abstract

On the basis of morphological data presented herein, Plectrachne Henr. is included in Triodia R.Br. This congeneric change requires 15 new combinations and three new nominations. In Triodia R.Br. sens. lat., 11 new species are proposed, one subspecies is raised to specific rank, while three species and six varieties are reduced to synonyms. For the first time, Triodia melvillei and T. schinzii are recorded for South Australia, T. bunicola for Victoria, T. mollis for Queensland and T. marginata for New South Wales. Although probably monophyletic, Triodia as here interpreted is widely variable. Thus, a classification of nine informal infrageneric groups is proposed.