Rhizomes present. Cauline stems terete, without spots, ca. 50 cm. Turions unknown. Leaves submersed and floating, ± spirally arranged. Submersed leaves sessile, lax; stipules persistent, inconspicuous, convolute, free from blade, whitish, not ligulate, 2.5--4 cm, delicately fibrous, eventually shredding, apex acute; blade dark green to olive-green, narrowly linear, not arcuate, 15--20 cm ´ 0.7 mm, base attenuate, not clasping, not lobed, margins entire, not crispate, apex not hoodlike, acute, lacunae absent; veins 1. Floating leaves: petioles continuous in color to apex, 4--6.5 cm; blade adaxially dark brown, elliptic, 4.5--6.6 cm ´ 7--12 mm; base acute, apex acute; veins 7--11. Inflorescences unknown. Fruits unknown.
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