Stems terete, 1–2 mm. in diameter, whitish to dark green.. Leaves mostly in whorls, rarely spirally arranged or subopposite near base of stem or linear or linear-lanceolate, acute to subobtuse, mid-green to dark green, patent, spreading or somewhat recurved, flaccid, somewhat translucent, 7–32 mm. long, 1.2–1.8(–2.3) mm. wide, with 2 narrow bands of sclerenchyma fibres on either side of midrib and 2–4 bands of submarginal fibres; margins ± hyaline, denticulate, the teeth usually patent, without a distinct basal portion.. Nodal scales triangular-subulate, the margins entire.. Male spathe ovate, 3–4.5 mm. long, 1.5–2.5 mm. wide, pinkish, containing up to 40 flowers.. Male flowers: sepals and petals ovate, 1–1.2 mm. long, ± 0.6 mm. wide, whitish, translucent; stamens ± 1.35 mm. long; anthers ± 0.5 mm. long, purple; filaments ± 1.3 mm. long, colourless.. Female spathe narrowly ovate, 2.5–4.5(–5.5) mm. long, 0.8–2.3 mm. wide, pinkish purple.. Female flower: sepals ovate, 1–1.3 mm. long, 0.5–0.8 mm. wide, white, translucent; petals narrowly ovate to ovate, ± 1 mm. long, 0.5 mm. wide, white, translucent; ovary ± 3 mm. long, with 5–7 ovules; perianth-tube up to 30 mm. long; stigmas 1–1.4 mm. long, dark purple.. Fruit narrowly ovate, 6.5–7.2 mm. long, 0.85–1.8 mm. wide, purplish.. Seeds ± ellipsoid, 2.6–3.2 mm. long, 0.7–1 mm. wide, brown.
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Male flowers white, borne on slender pedicels about 2 in. long.
Submerged, densely leafy aquatic rooting in streams