A revision of Themeda (Gramineae) in Malesia with a new species from Laos

Themeda Forssk. (Gramineae) has 11 taxa in Malesia. A revision is provided with keys, synonymy, where necessary lectotypifications, descriptions, and notes. Themeda gigantea nearly is a Philippine endemic, but with a single collection from Halmahera, and one as far away as the Solomon Islands. Themeda caudata is reduced to T. villosa var. caudata, comb. nov., and T. intermedia to T. villosa var. polyantha, comb. nov. Themeda polycephala, a new species, is described from Laos. Themeda hookeri is a new record for Thailand.