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Annuals. Culms densely tufted, 4-20 cm tall, slender, flatly 3-angled, smooth, with few leaves at base. Leaves shorter than culm; sheath yellowish green with rust-colored flecks, short, white pilose; leaf blade 0.7-1.5 mm wide, flat, margin apically ciliate, abaxially sometimes sparsely hairy. Involucral bracts 2-5, leaflike, suberect, basal 1 or 2 equaling or longer than inflorescence. Inflorescence a compound or decompound anthela, lax; rays 4-10, to 4 cm, slender. Spikelets solitary, oblong-ovoid, ovoid, or oblong, 2-7 × 1-1.8 mm, 10-20-flowered, apex acute. Glumes spirally imbricate, brown, broadly ovate, 1.2-2 mm, membranous, 3-veined forming an abaxial green keel. Stamens 1 or 2; anthers narrowly oblong-ovoid. Style long and compressed, ciliate, basally inflated; stigmas 2. Nutlet yellowish white, very shortly stipitate, broadly obovoid, ca. 0.8 mm, biconvex, with transversely oblong reticulation. Fl. and fr. Jul-Sep(-Nov). 2n = 10, 16, 20.
Tufted, erect annual, 100-300 mm tall. Leaf blades flat, up to 2 mm wide. Inflorescence compound, of many stalked clusters of spikelets each individually stalked, radiating from stem apex, overtopped by suberect, leaf-like basal bracts. Spikelets ovoid, 3-4 x 1-2 mm, light brown.
Annual herb, up to 300 mm tall. Biconvex nuts and 2-branched styles predominating within spikelet. Leaves eligulate, blades pilose to glabrescent near base, hairs sometimes dense, but never aggregated into a ligule. Glumes light brown.
Inflorescence of many linear-lanceolate to cylindric light brown spikelets
Annual, 10-30 cm. Spikelets small, brown.
Annual herb to 30 cm. high
Numerous short leaves
