Cyanea horrida (haha nui) is a palm-like tree endemic to east Maui. This member of the Campanulaceae (bellflower) family grows from 1 to 4 m (3 to 12 feet) tall with pinnately parted or divided leaves 20 to 37 cm (8 to 14 in) long and 10 to 19 cm (4 to 8 in) wide. Both the leaves and stems are covered in short projections. The inflorescences are 5- to 8-flowered, blackish-purple or greenish-white suffused with purple and covered densely in fine hairs or short projections. Berries are yellow with persistent calyx lobes. Cyanea horrida is most closely related to two other Maui endemics, C. aculeatiflora and C. macrostegia, and hybrids with the latter have been documented.