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Annual, tufted, up to 2 m high. Leaf blades 300-600 mm long, 8-15 mm wide. Culms robust, unbranched. Spikelets 14-20 mm long. Inflorescence light green variegated with dark purple; spikelets in lax triads, pedicels unequal, the 2 lower spikelets usually reduced; lower lemma 7-nerved; female-fertile lemma loosely hairy, lobes acute and 4 mm long, central awn 10-22 mm long.
Superior lemma 7-nerved, pilose on the body and with a row of 6–8 tufts across the back, bilobed, with an awn 2–3.5 cm. long.
Palea keels narrowly winged to the apex, the wings terminating in a small clavate appendage, papillose between keels.
Leaf laminae 5–20 mm. wide, one margin crinkly.
Inferior glume 1/3 length of spikelet, acute.
Panicle 25–50 cm. long, loose.
Spikelets 14–20 mm. long.
Inferior lemma 7-nerved.
Culms 0.5–3 m. high.
An annual grass.
Robust annual.
