Annual herb up to 15 cm. Leaves sessile, linear, sparsely pubescent, 3-6 by 0.7 mm, apex mucronate. Stipules scarious, ovate-oblong, acute, apex irregularly fimbriate, 2.5 by 0.7 mm. Sepals 5, scarious, ovate-oblong, acute, glabrous, 3-4.5 by 1-1.5 mm, with midrib 1-1.5 mm from the base. Petals scarious, free, narrowly oblong, 2.5-3 by 0.5-0.7 mm, usually with clearly 2-dentate apex. Stamens 2.5-3 mm long; Ovary ellipsoid. Capsule ellipsoid, 1.7 mm long. Seeds c. 8, subreniform, 0.5 mm, light brown.