Cyanea longiflora, a member of the Campanulaceae (bellflower) family, is an unbranched shrub with woody stems 1 to 3 m (3.5 to 10 ft) long. The leaves are elliptic or inversely lance-shaped, 30 to 55 cm (12 to 22 in) long and 6 to 12 cm (2.4 to 4.7 in) wide. Mature leaves have smooth or hardened leaf edges with shallow, ascending, rounded teeth. The flowering stalks are 5- to 10-flowered and 3 to 6 cm (1.2 to 2.4 in) long. The calyx lobes are fused into an irregularly toothed sheath 2 to 4 mm (0.08 to 0.2 in) long. The petals, 6 to 9 cm (2.4 to 3.5 in) long, and the hairless staminal column are dark magenta. The berries are almost pear-shaped.