General: Weak annual herb, rooting nodally; stems ascending or erect, freely branching, 2-6 cm tall, glabrous.
Leaves: Opposite, entire, succulent, oblong egg-shaped, 1.5-3 mm long.
Flowers: Inflorescence of flower clusters in the leaf axils; flowers usually 4-merous, greenish, short-stalked but lengthening in fruit; calyces cup-shaped; petals no longer than the sepals, whitish.
Fruits: Follicles, less than 2 mm long, purplish, 1-2 seeded.