Clump-forming herb to nearly 1 metre high. Leaves often ± vertical. Sepals reflexed, to c. 1 x 0.8 cm, very convex. Petals c. 1.5-1.8-(2) cm diameter, suborbicular, very delicate and crimped with undulate margins, white. Stamen bundle c. 1 cm across. Common but very local in this swamp.