Culms erect or geniculate at base, 30–60 cm tall, 1.5–2.5 mm in diam., 3-or 4-noded, glabrous. Leaf sheath glabrous; ligule ca. 0.5 mm, membranous, apex truncate; leaf blade flat or involute at margin, 3–10 × 0.2–0.4 cm, both surfaces usually glabrous. Spike erect, 5–13 × ca. 0.4 cm; rachis glabrous, but margin ciliolate; internodes 5–7 mm. Spikelets green or purplish green, 10–14 mm, with 2–4 florets; rachilla puberulent. Glumes lanceolate or oblong-lanceolate, usually subequal, 7–11 mm, 4–6-veined, glabrous, margin membranous, apex pungent or mucronate. Lemma lanceolate, abaxially spinose; first lemma 8–10 mm; awn 1–3 mm. Palea slightly shorter or longer than lemma, ciliolate along keels, glabrous between keels. Anthers yellow, 1.5–2 mm. Caryopsis oblong, ca. 6 mm. Fl. and fr. Aug.
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