The leaves are arranged in opposite pairs along the stems and are heart-shaped or triangular with an acute tip and a broad base. Leaves may be 4-13 cm long. The flowers , each 3-5 mm long, are arranged in dense terminal or axillary corymbs.
Individual florets are white to greenish-white.
Grows best where fertility, organic matter, soil moisture, and humidity are all high. Can tolerate some shade. Seed dispersed by wind or in clothing or hair of animals. Vegetatively reproduces from broken stem fragments. Each node of the stem can produce roots.