Clermontia oblongifolia ssp. mauiensis of the Campanulaceae (bellflower) family grows only terrestrially as a shrub or tree, reaching a height of 2 to 7 m (6.6 to 23 ft). Leaves are oblong or elliptic, have thickened. rounded teeth, and reach a length of 8 to 19 cm (3 to 7.5 in) and a width of 2 to 5 cm (0.8 to 2 in). Two flowers, or sometimes three, are grouped together on a stalk 0.5 to 4.5 cm (0.2 to 1.8 in) long, each individual flower with a stalk 1 to 4.5 cm (0.4 to 1.8 in) long. The flower is 6 to 7.6 cm (2.4 to 3.1 in) long. The calyx (sepals) and corolla (petals) are similar in size and appearance, each forming an arched tube which is greenish white or purplish on the outside and white or cream colored on the inside. The nearly spherica orange fruit is a berry, 17 to 30 mm (0.7 to 1.2 in) long.