Cyanea humboldtiana, a member of the Campanulaceae (bellflower) family, is an unbranched shrub with woody stems 1 to 2 m (3.2 to 6.6 ft) tall. The leaves are inversely egg-shaped to broadly elliptic, 18 to 45 cm (7 to 18 in) long and 7 to 16 cm (2.8 to 6.3 in) wide. The leaf edges are hardened and have shallow, ascending rounded teeth. Five to twelve flowers are arranged on a hairy, downward bending flowering stalk which is 8 to 25 cm (3 to 10 in) long. The dark magenta or white petals are 6 to 7.5 cm (2.4 to 3 in) long and hairy. The pale orange- yellow berries are elliptic to inversely egg-shaped.