Plants terrestrial, annual. Stems erect, red in age, simple or often branching, 1-6 cm. Leaf blades oblong, 1-3 mm, apex acute, apiculate. Inflorescences compact, crowded; flowers (1-)2 per node. Pedicels 0.2-0.5(-1.5) mm. Flowers 3(-4)-merous; sepals lanceolate, 1-1.5 mm, apex attenuate, apiculate; petals narrow-lanceolate, 0.5-1 mm. Follicles ascending, (1-)2-seeded, ovoid; old follicles ascending, boat-shaped. Seeds ellipsoid, 0.3 × 0.2 mm, not papillate, dull, smooth to minutely rugulose. 2n = 64.