Habit, vegetative morphology . Vegetative, with internodes not elongated, erect, with bladeless sheaths at the base, the uppermost of these to 20 cm long and clasping the solitary, terminal blade-bearing leaf.
Culm sheaths persistent.
Culm internodes of the fertile culms hollow. Reproductive organization . The male and female-fertile spikelets segregated, in different parts of the same inflorescence branch. Female-sterile spikelets . Rachilla of male spikelets prolonged beyond the uppermost male floret.