Rotala rosea (Poir.) C.D.K.Cook

Annual herb. Stems erect, simple or branched, to 25 cm tall. Leaves decussate, sessile, linear-lanceolate to ovate, to 20 mm long, obtuse or acute, the base obtuse or cuneate. Bracts leaf-like on main stem, on upper lateral branches bracts smaller, to 8 mm long; bracteoles linear-lanceolate or filamentous, usually as long as hypanthium. Hypanthium campanulate, c. 1.5 mm long; appendages 5, rarely 4 or absent, usually equal to or shorter than sepals, rarely longer, subulate. Sepals 5, rarely 4, shallowly triangular, c. 0.5 mm long. Petals 5, rarely 4, elliptic to oblong, usually as long as sepals. Stamens 5, rarely less, inserted just below middle of hypanthium. Style very short or absent. Capsule globose, c. 2 mm diam., opening by 3 valves.

Grows in swamps and damp areas.