or annual, monoecious grasses.
Inflorescence of axillary, spiciform, spatheate racemes, each bearing pairs of
unisexual awnless spikelets, female pairs below male pairs. Female spikelets
sessile, dorsally compressed, closely appressed to internodes, with one fertile
and one neuter florets; lower glume thick, coriaceous, upper glume membranous;
lemmas and paleas thin, hyaline. Male spikelets 2-flowered, both or only the
lower bearing stamens, glumes membranous. Caryopsis enclosed but free, hilum