Signalgrass

Annuals or perennials. Leaves: lamina linear or lanceolate; ligule a line of hairs. Inflorescence of racemes borne upon a short common axis; spikelets single and abaxial or paired. Spikelets lanceolate to ovate, plano-convex, cuspidate to acuminate; lower glume mostly shorter than spikelet; upper glume as long as spikelet, usually membranous; lower floret male or sterile, lower lemma resembling upper glume; upper lemma obtuse, mucronate.