Plants annual. Vegetative stems submersed with elongate inter-nodes, or emersed and short. Flowering stems 6–15 cm, distal internode 4–8.5 cm. Sessile leaves submersed and thin, or emersed and thickened, 5–15 cm × 1–6 mm. Petiolate leaves and stipules not produced. Inflorescences spicate, 7–24-flowered, elongating over several days; spathes 1.2–4 cm; peduncle 4–9 cm, glandular-pubescent when emersed. Flowers 2–10 per inflorescence opening each day; perianth mauve, salverform, tube 2–6 mm, limbs zygomorphic, lobes narrowly elliptic, 8–13 mm, proximal lobe shorter; stamens unequal, lateral stamens 2.7–7 mm, filaments obliquely inflated at center, bent upward apically, glabrous; central stamen 5.9–10 mm, filament linear; style glabrous. Seeds 12–15-winged, 0.7–1 × 0.6–0.9 mm, outer integument composed of additional surface layer of tetragonal to hexagonal isodiametric cells.
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