Coelorachis

Rottboellia similar but with hispid nodes and sheaths

Hemarthria with similar but flattened (vs. cylindric) pencil-like raceme

1. Spikelets strongly rugose; rachis adjacent to the sessile spikelet bent; flowering spring-summer…C. rugosa

1. Spikelets smooth or nearly so; rachis adjacent to the sessile spikelet straight; flowering summer-autumn…C. tuberculosa