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Annual. Leaf blades flat, linear or linear-lanceolate; ligule a short ciliate membrane. Inflorescence of single axillary racemes aggregated into a spathate compound panicle, peduncle enclosed within spatheole; racemes flattened, dorsiventral, bearing paired spikelets, fragile, obliquely articulated; rachis internodes stoutly oblong, adnate to adjacent pedicel, together forming a cavity, base obliquely truncate with central peg. Sessile spikelet much broader than internode; lower glume brittle, hemispherical, rugose, pitted to honeycombed, wingless, narrowed into a stipelike base; upper glume shorter and narrower, sunk into cavity of rachis; lower floret barren, without a palea; upper floret with entire awnless lemma. Pedicelled spikelet readily disarticulating, narrowly ovate, herbaceous, smooth, narrowly winged; pedicel oblong, adnate to adjacent rachis internode, junction with internode marked by a line. x = 7.
Annuals. Leaf-blades flat, coarse; ligule a very short ciliate membrane. Inflorescence a single raceme, these numerous and aggregated into a spathate false panicle; racemes dorsally compressed; internodes flattened, oblong, cupuliform above, fused to the adjacent pedicel. Sessile spikelet globose; callus truncate, oblique, with a central boss; lower glume hemispherical, crustaceous, pitted and tuberculate, wingless; upper glume partly adherent to the enclosing internode; lower floret reduced to a hyaline lemma; upper lemma entire and awnless. Caryopsis oblate, slightly dorsally flattened. Pedicelled spikelet narrowly ovate, herbaceous, narrowly winged; pedicel broadly linear, scarcely distinguishable from the internode.
Spikelets very dissimilar, in pairs at the nodes of a disarticulating rachis, the rachis segments and pedicels grown together, more or less clasped by the margins of the first glume of the sessile spikelet; sessile spikelet globose, the first glume indurate, alveolate; pedicellate spikelet conspicuous, staminate or sterile, mem-branaceous, flattened, the first glume broad, rather strongly nerved, acute, the keels winged.
Sessile spikelet globose; callus truncate, oblique, with a central boss; inferior glume hemispherical, crustaceous, rugose to cancellate, granular all over, wingless; superior glume partly adherent to the enclosing internode; inferior floret reduced to a hyaline lemma; superior lemma entire and awnless.
Inflorescence a single axillary raceme, these numerous and aggregated into a spathate false panicle; racemes dorsally compressed; internodes flattened, oblong, cupuliform above, fused to the adjacent pedicel.
Pedicelled spikelet narrowly ovate, herbaceous, the inferior glume narrowly winged; pedicel broadly linear, scarcely distinguishable from the internode.
Ligule a very short ciliate membrane; leaf laminas flat.
Caryopsis oblate, slightly dorsally flattened.
Annuals.
