Signalgrass

Annuals or perennials. Inflorescence of racemes along a central axis; spikelets single and adaxial, paired or rarely in fascicles. Spikelets plump, obtuse to acute; sometimes the lowest internode elongated and then forming a short stipe (B. nigropedata) lower glume usually shorter than spikelet; lower lemma awnless (rarely in B. nigropedata and B. serrata with a short awn point); upper lemma as long as the spikelet, coriaceous to crustaceous; apex acute, obtuse or rarely mucronulate.