Annual, viscid-pubescent, 10-50 cm. Stems simple or branching from base. Leaves 2-6 cm., sessile, oblong-lanceolate to lanceolate-linear, acute, puberulent. Inflorescences loosely dichasial, few-flowered. Bracts lanceolate. Pedicels mostly shorter than calyx, elongated in fruit. Flowers 1.7-2.4 cm., pink to pale red. Calyx 1.5-2 cm., 30-nerved, conical-cylindrical, umbilicate, in fruit globular-inflated with attenuate apex, pubescent, green, with lanceolate teeth half as long as tube. Petals entire, emarginate or 2-fid. Capsule sessile (without carpophore), almost equalling calyx. Seeds tuberculate-wrinkled. Fl. March-May.