Vertical shoot annual or continuously growing, aseasonal; stem slender, terete, unbranched or with short axillary leafy shoots; horizontal shoot slender to robust, much branched. Floating leaves elliptic to oblong-lanceolate with rounded tip, petiolate, lamina 65-115 by 18-27 mm, 13-17-veined, base cuneate, apex rounded, petioles 115-185 mm; submerged leaves oblong-lanceolate to lanceolate, petiolate, lamina 105-160 by 12-28 mm, 9-13-veined, margin entire, base cuneate to slightly cordate or sagittate, apex rounded to acute, petioles (2-)8-45 mm; stipules axillary, convolute, 60 mm, acute. Spikes cylindrical, contiguous, 21-28 mm; peduncles 130-180 cm, approximately as long as the petioles of the adjacent floating leaves, considerably thicker than the stem. Flowers numerous, with 4 carpels. Ripe fruits not seen. Stem anatomy: Stele of trio or proto type. Endodermis of O-type. Interlacunar bundles and subepidermal bundles absent. Pseudo-hypodermis absent.
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