Crinum pedunculatum is a large bulbous perennial herb, which may reach 2 (or even 3) m high by a 2-3 m spread.
The leaves are strappy and up to 2 m long by 15 cm wide and thickened, with blunt points. The flowers, occurring throughout the year, are about 10 cm across and borne in clusters of 10-25. The pleasantly perfumed flowers are most commonly white, but a form with reddish-purple flowers also occurs. They are followed by rounded, beaked seed fruits 2 to 5 cm across, each containing one to several seeds.
Two color forms of this species occur in Hawaii: one with green leaves and white flowers, and the other with reddish leaves and pink to purple-red flowers (Staples & Herbst, 2005).