The stem is hollow and the leaves are 15–20 cm (5.9–7.9 in) long, borne in whorls of four on very short petioles. The inflorescence is huge, consisting of many tubular snow white flowers in a terminal cluster up to 0.6 m (2 ft) long. The tubes of the flowers are about 10 cm (3.9 in) long and droop downward, and the expanded corollas are about 5 cm (2.0 in) across.