Aquatic Botany 9: 16, fig. 1. 1980.
Rhizomes with 2 scales at each node. Erect stems absent. Leaves apparently attached to rhizome, 5–25 × 1–4 mm; blade linear-lanceolate, base cuneate, margins entire, glabrous, apex round to round-acute. Inflorescences: spathe 2-leaved, enclosing pistillate flowers. Flowers unisexual, staminate and pistillate on different plants; staminate flowers unknown; pistillate flowers sessile, ca. 5 mm. Fruits ovoid. Seeds not seen.
Phenology: Flowering spring–summer.
Habitat: Sandy substrates of marine waters
Elevation: -2–0 m