Annual, glandular-pubescent herb, 10-35 cm. Stems erect or ascending, simple or branching. Leaves up to about 3 x 1 cm., the lower obovate-spatulate, tapering into a petiole, the upper all sessile, oblong-elliptical, apiculate. Inflorescences dichasial, flowers clustered. Pedicels shorter than calyx, later spreading or recurved. Calyx about 5 mm.; sepals oblong-lanceolate, acute-acuminate, white-margined, with a few long hairs at tip. Petals about as long as sepals, white, 2-fid, sometimes 0, with one or more cilia on each side near base. Stamens 10. Styles 5. Capsule about 1 cm., narrowly cylindrical, slightly curved above, opening by short, acute teeth with revolute margins. Seeds finely tuberculate. Fl. February-April.