Weak tufts, (7)-20-40 cm, stoloniferous, with decumbent culms rooting at lower nodes, erect or floating above; branching extravaginal. Leaf-sheath chartaceous, smooth, or scabrid, especially towards ligule, uppermost sheaths often scabrid throughout. Ligule 1.5-4.5-(5) mm, long-tapered, acute, entire, becoming lacerate, abaxially smooth or sparsely, minutely scabrid. Leaf-blade 5.5-12.5 cm × (0.6)-1-3 mm, flat, or inrolled, papillose-scabrid, abaxially shallowly ribbed, adaxially more obviously ribbed; margins minutely scabrid, tip acute. Culm internodes smooth, sometimes scabrid just below nodes. Panicle 6.5-13 cm, ± erect, enclosed below by uppermost leaf-sheath; branches and pedicels filiform, scabrid. Spikelets 15-25 mm, 3-6-flowered, pale green; florets chasmogamous and cleistogamous within the same spikelet. Glumes unequal, glabrous, obtuse, margins ciliate-scabrid; lower 2-3.3 mm, 1-nerved, narrow-lanceolate, upper (2.2)-3.5-4 mm, 3-nerved, ± ovate-lanceolate. Lemma (4)-4.5-5.5 mm, 7-nerved, firm, green central portion sparsely scabrid, smooth near base, hyaline margin very wide, finely minutely hairy or scabrid; lemma lobes 2, obtuse; awn 7.5-18 mm, stout, straight, arising from near midpoint of lemma. Palea < lemma, keels densely stiff-ciliate, interkeel glabrous. Callus with ring of fine hairs < 1 mm. Rachilla prolongation 1.5-1.8 mm, hairy above. Anthers in chasmogamous florets 1.4-1.7 mm; in cleistogamous florets 0.4-0.5-(0.8) mm. Caryopsis 1.5-2 × 0.5-0.7 mm.
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Rhizomatous or stoloniferous. Culms decumbent, to 75 cm high. Leaves: ligule 6.5–12 mm long; blade to 25 cm long, 2–4.5 mm wide, scabrous. Panicles to 35 cm long; primary branches paired or clustered. Spikelets 9–15 mm long, with (5–) 6–10 (–12) cleistogamous and/or chasmogamous bisexual florets; pedicel to 20 mm long. Glumes unequal; lower glume 2.7–3.7 mm long, 1–3-nerved; upper glume 3.4–4.5 mm long, 3–5-nerved. Lowest lemma 3.7–5 mm long, 2-toothed, (5–) 7-nerved, scabrous to hispid; teeth 0.3–0.6 mm long; awn arising 40–60% of lemma length below tip, 11–17 mm long, straight, with column slightly twisted or not. Palea acute. Caryopsis 1.3–1.7 mm long.
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