Glabrous, glaucous annual herbs with rigid stems. Leaves linear or oblong-lanceolate. Flowers 4-5-merous, solitary or in few-flowered spreading cymes. Bracts white-margined. Sepals lanceolate, acute with broad white membranous margins. Petals entire or denticulate at apex, white or blue. Stamens (4-)8-10; styles (3-) 4 (-5), opposite the sepals. Capsule straight, dehiscing with twice as many short obtuse teeth as styles. Seeds nomerous, reniform, papillose.