Cyanea copelandii ssp. haleakalaensis, a member of the bellflower family, is a vine-like shrub 0.3 to 2 m (1 to 7 ft) tall, with sprawling stems. The sap of this species is a tan latex. Stems are unbranched or sparingly branched from the base. The leaves are elliptical, 10 to 19 cm (4 to 7 in.) long, and 3.5 to 8.5 cm (1.4 to 3.3 in) wide. The upper surfaces of the leaves have no hairs, while the lower surfaces are hairy. The margins of the leaves are thickened, with small, widely spaced, sharp teeth. The leaf stalks are 2.5 to 10 cm (1 to 4 in) long. The inflorescences are 5 to 12-flowered and hairy. The main inflorescence stalks are 20 to 45 mm (0.8 to 1.8 in) long. The hypanthium is oval and widest at the top, 6 to 10 mm (0.2 to 0.4 in) long, about 5 mm (0.2 in) wide, and hairy. The corolla (petals collectively) is yellowish but appears pale rose in color due to a covering of dark red hairs. The corolla is 37 to 42 mm (1.4 to 1.6 in) long and about 5 mm (0.2 in) wide. The corolla tube is gently curved and the lobes spread about 0.25 times beyond the tube. The berries are dark orange, oval, and 7 to 15 mm (0.3 to 0.6 in) long.