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Lemma 7-9 mm. long, smooth below, strongly punctulate towards the apex; callus slender, c. 2 mm. long, 2-fid, barbate; column 2-3 cm. long, prominently twisted, scabrous; awns subequal, scabrous, 3.5-5.5 cm. long; articulation between the apex of the lemma and the base of the column.
Glumes very unequal, 1-nerved, glabrous; the inferior 5-7 mm. long, broadly lanceolate, slightly 2-fid, minutely serrulate-ciliate at the margins towards the apex; the superior 15-20 mm. long, narrowly linear with a mucro from a 2-fid apex.
An annual grass. It is a robust tufted plant. It grows 1.5 m high. The stems usually have 3 nodes. The leaf blade is 30 cm long by 0.4 cm wide. The flower panicle is 50 cm long. It can be nodding.
Panicle up to 50 cm. long, effuse and very lax, often nodding, often few-flowered; branches glabrous or scaberulous, 2-or 3-nate with filiform branchlets; axis smooth.
Leaf-laminae up to 30 x 0.3-0.5 cm., when expanded, involute or more or less flat at the base, prominently nerved and scabrous above, smooth beneath.
Culms erect, simple or slightly branched from the upper nodes, glabrous, usually 3-noded; nodes glabrous.
Spikelets pallid or tinged with red or purple, especially at the base, sometimes with a black spot.
Ligule a short-ciliate rim; auricles with a tuft of woolly hairs; collar glabrous.
Annual, up to 1.5 m. high, robust, laxly caespitose.
Leaf-sheaths slightly scaberulous or glabrous.
Robust annual 90–120 cm. high
Convolute leaf-blades
Purplish glumes.
