The plant, which may attain 5 or 7 metres (16 or 23 feet) in height, has elliptic to lance-shaped, bright-green leaves about 7.5 cm (3 inches) long. The handsome axillary orange-red flowers are borne toward the ends of the branchlets. The calyx (comprising the sepals) is tubular and persistent and has five to seven lobes; the petals are lance-shaped, inserted between the calyx lobes. The ovary is embedded in the calyx tube and contains several compartments in two series, one above the other.