Stems 0.5--3 cm. Leaves 2.5--60 ´ 0.2--1.2 cm, margins finely serrate, apex acute. Inflorescences: peduncles to 50 cm [sessile]; spathe flattened. Flowers mostly solitary, rarely paired, projected to water surface; stamens 3. Fruits terete, 20--80 ´ to 5 mm. Seeds 1.2--1.8 mm.

Flowering summer--fall. Shallow water of pools and lakes; introduced, 0--50 m; introduced; La.; native, Asia; Africa; Australia.

Blyxa aubertii is known in the Western Hemisphere only from a few collections in southern Louisiana.