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Perennial or annual, caespitose to spreading. Culms erect or geniculately ascending or decumbent, 10–60 cm long, without nodal roots or rarely rooting from lower nodes. Leaves: ligule acute; blade 2–15 cm long, (0.5–) 1–3 (–5) mm wide. Panicles mostly 2–6 cm long, 3–6 mm wide. Spikelets (1.5–) 2.5–3.5 mm long. Glumes ± equalling or slightly shorter than lemma, 1.5–3.5 mm long, narrowly ovate to narrowly elliptic, obtuse, connate only at base, membranous, lacking keel-wing, with veins prominent, ± villous-ciliate along keel and often with similar hairs scattered on sides (margins and outer veins). Lemma elliptic, with margins fused for ⅓–½ their length, 2–3.5 mm long, emarginate, similar in firmness to glumes, 5-veined, glabrous; awn (0.5–) 1–2 (–4?) mm long, attached just below or c. midway (or possibly near apex), ± straight, scarely exceeding (to c. 1 mm) glumes or when subapical may be exserted to 1.5 mm or more. Anthers 0.6–1.5 mm long.
Annual, loosely tufted. Culms weak, geniculately ascending, occasionally rooting and branching from lower nodes, 15–40 cm tall. Leaf sheaths smooth, glabrous, slightly inflated; leaf blades light green, soft, 3–10 cm, 2–6 mm wide, abaxial surface smooth, glabrous, adaxial surface closely ribbed, scaberulous; ligule 2–5 mm. Panicle narrowly cylindrical, 2–7 cm, pale gray-green. Spikelets elliptic or oblong, 2–3 mm; glumes membranous, smooth, keels ciliate-hispid, lateral veins hispid on lower part, margins connate at base, apices obtuse; lemma equaling or slightly longer than glumes, margins connate below middle, awned from lower 1/4–1/3, apex obtuse; awn included within spikelet or exserted up to 1.2 mm, straight. Anthers orange, 0.5–0.8 mm. Fl. and fr. Apr–Aug. 2n = 14.
Annual or short-lived perennial 2–5 dm; culms very slender, erect or decumbent at base, solitary or in small tufts; infl slender, 2–8 cm × 3–5 mm, scarcely tapering; glumes 2–2.7 mm, connate near the base, blunt and scarious at the tip, villous-ciliate on the keel; awn attached just below midlength of the lemma, straight, equaling the glumes or exsert to 0.5(–1) mm; anthers 0.5–1 mm; 2n=14. In mud or shallow water; circumboreal, s. to N.J., Ind., Mo., and Calif.
An annual or perennial grass which grows up to 30 cm high. It can form roots at the lower nodes. The leaf blades are 2-10 cm long by 2-5 mm wide. The flower panicle is 2-6 cm long by 3-6 mm wide. It is cylinder shaped. The spikelets are 1.5-3 mm long.
