A small, erect, annul herb, 5-20 cm tall, branched from base; stem 4 winged or angled; leaves of 2-types; radial leaves in rosettes, lanceolate-oblong, obtuse at apex; cauline ones smaller, linear-oblong, acute or subotuse at apex, glabrous; flowers in dichotomous cyme; bracts narrow, inconspicuous; flowers 1-2 cm across, star shaped, with 5 spreading petals; calyx segments-5, linear, shorter than corolla-tube; corolla rosy-pink or purple, lobes-5, elliptic, acute; stamens 5, inserted in the upper half of corolla-tube, anthers twisting spirally after dehiscence; ovary linear, 1-locular, style slender, stigma 2 lobed; capsules linear-oblong as long as calyx, 2 valved, many seeded.