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Loosely tufted, yellow-green, very short-lived, free-seeding annual, to 25 cm; branching intravaginal; leaf-blades persistent. Leaf-sheath very pale green to light brown, hyaline, glabrous, keeled. Ligule 0.5-3 mm, entire, rounded or tapering, glabrous throughout. Leaf-blade 1-5 cm × 1.5-4 mm, flat or folded, thin, glabrous; margins sparsely and minutely scabrid, tip rounded to blunt point. Culm 0.5-20 cm, erect, spreading or prostrate, internodes glabrous. Panicle 0.5-6 cm, lax, erect, with very fine, glabrous branches spreading after anthesis. Spikelets 3-5 mm, with 2-5 rather distant florets, light green. Glumes subequal to unequal, glabrous; lower 1-2 mm, 1-nerved, elliptic, subobtuse, upper 1.5-2.5 mm, 3-nerved, ovate-oblong, obtuse. Lemma 2-2.5 mm, 5-nerved, ovate-oblong, obtuse, strongly silky haired on nerves for more than ½ length, nerves glabrous above hairs, internerves glabrous, often purplish on hyaline band at tip; margins hyaline. Palea 2-2.5 mm, = lemma, keels strongly ciliate, often purplish, interkeel glabrous. Callus glabrous. Rachilla c. 0.5 mm, glabrous; prolongation minute. Lodicules c. 0.2 mm. Anthers (0.1)-0.2-0.4 mm. Caryopsis c. 1 × 0.5 mm, tightly enclosed by lemma and palea.
Weakly caespitose annual. Culms 4–20 cm high, slender, weak; mid-culm internodes glabrous, often compressed. Young shoots intravaginal. Leaves: basal sheaths with margins connate in lower half, glabrous; ligule 0.9–2.6 mm long, acute or obtuse, glabrous, thinly membranous; blade flat, (0.5–) 2–5.5 (–8) cm long, 0.9–3 mm wide, thin-textured, glabrous, bright green. Panicles finally ovate or triangular with spreading branches, 1.8–4.5 cm long. Spikelets often sessile or subsessile, (2–) 3.6–4 mm long, with 2–4 bisexual florets. Lower glume 0.9–1.5 mm long, 1–3-nerved, with lateral nerves short; upper glume 1.3–2.1 mm long, 3-nerved. Web absent. Lemma 1.8–2.5 mm long, 5-nerved, with nerves densely hairy at least in lower half; intercostal regions glabrous or puberulous. Anthers 0.2–0.5 mm long.
