Up to c. 40 cm, lower internodes 2-6 cm, by (0.5-)0.7-0.85(-1.2) mm. Leaves (1.5-)1.75-4 cm by 0.6-1.2 mm, flat, tip blunt (rounded) to acute (blade c. 3 mm below the tip 0.3-0.9 mm wide); margin on either side with 14-60(-70) spiny teeth; dorsal surface without spines; spine-cells (0.05-)0.1-0.2 mm, on the auricles up to 0.3 mm, on the tip of the spathe rarely up to 0.4 mm long, brownish, rarely yellowish green; teeth shallow, up to c. 0.16, near the tip up to c. ⅓ as long as the width of the blade; midrib 0.1-0.07 as wide as the blade; cavities variable in width, septa sometimes distinct. Sheath (1.5-)2-4.7(-5) by (1.5-)2-3(-3.5) mm, on either side with 5-25 spines, (0-)1-3(-4) on the inner edge of the auricle; auricles long-triangular, mostly 1.5-2 times as long as broad, with an obtuse (rounded) to acute apex, rarely falcate, (0.4-)0.6-1.9(-3) by (0.25-)0.6-1 mm, entire, sometimes shallowly lobed (or somewhat lacerate). Flowers solitary or 2-3 together. Male flowers: spathe 2-3.8 mm, subsessile (very rarely up to 0.8 mm stalked), neck mostly cylindrical, (0.4-)0.5-1 mm, tip almost truncate to oblique, entire to lobed; anther subsessile, 4-celled, ovate-elliptical to sl'ghtly oblong, 1.2-2.5 by 0.75-1.1 mm, 'perianth' lobes distinct, (shallowly) rounded. 'Pedicel' c. 0.2 mm, in anthesis 1.5-2.3(-2.7) mm. Female flowers espathaceous, 1.5-3.5 mm; ovary 0.5-0.9(-1) by 0.2-0.35 mm, style 0.4-1(-1.2) mm, with 2 stigmas 0.3-0.8(-1.7) mm. Seeds (l.l-)1.2-2.3 by 0.4-0.75 mm; testa with 16-36 length-rows of (15-)20(-25) or 35-45 subquadrate or 5-6-angular areoles.
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Submerged, monoecious (or possibly dioecious), slender annual or short-lived perennial, to 1 m long, though mostly much shorter. Stems 0.5–1 mm diam.; internodes not spinescent. Leaves linear-lanceolate, flat, 12–25 mm long, 0.4–1 mm wide (including spines), acute; spines multicellular, 0.03–0.06 mm long; septa rarely present; fibres present; midrib without spines; sheath auriculate; auricle 0.5–1.5 mm long, serrulate or lacerate, acuminate, with 3–12 spines each side. Male flowers produced towards apex of branches, spatheate, 2–3 mm long; anther 1–1.3 mm long, tetrasporangiate. Female flowers produced lower down (or possibly on separate plants), espatheate, 3–4 mm long; ovary 2–2.5 mm long; style and stigma 1–2 mm long; stigma 2-or 3-lobed. Seed 1.7–2.6 mm long; style base persistent; testa distinctly pitted with areoles arranged in longitudinal rows of (30–) 35–48
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