Dichotomously branched, annual, 2-10 cm high, delicate herb. Stem branched from base or above, lineolate. Leaves 2-8 x 1.5-6 mm, oblanceolate-lanceolate or elliptic, acute, entire. Flowers solitary, terminal on 2-4 mm long pedicel, tetramerous. Calyx 1.5-3(-4) mm long, tube smaller than lobes; lobes 1-25 x 1.0-15 mm, lanceolate-oblanceolate, acute-acuminate, entire. Corolla tubular, smaller than calyx, 1-1.5 mm long; lobes 0.75-1.5 x 0.5-1.0 mm, ovate, entire, acute. Stamens 4, 3 sterile, 1 fertile; fertile larger than sterile. Ovary globose, 1.75-2.25 x 15-2.0 mm, capsule many seeded, seeds reticulate.