Rottboellia  

Annuals. Inflorescence a single raceme, either terminal or aggregated into a spatheate false panicle. Racemes fragile, cylindric or slightly flattened; internodes clavate with sunken spikelets, wholly or partly fused to the adjacent pedicel.   Sessile spikelet: callus truncate; lower glume broadly convex on the back, smooth; lower floret male with hyaline lemma and palea; upper lemma entire and awnless.   Pedicellate spikelet present, a little smaller than the sessile; pedicel oblong, flattened, scarcely distinguishable from the internode.