Sicyos macrophyllus (anunu) is a perennial vine in the gourd family (Cucurbitaceae) that is currently found on the island of Hawaii. Stems may be up to 15 m (49 ft) long, 4 cm (1.5 in) in diameter, sparsely pubescent, glabrate, and black-spotted. Leaves are broadly ovate to cordate, 7 to 25 cm (2.8 to 9.8 in) long, 6 to 26 cm (2.4 to 10 in) wide, and shallowly to deeply 3-5-lobed. Staminate flowers are in sparsely to densely pubescent panicles, 8 to 25 cm (3.1 to 9.8 in) long. Corolla is a greenish yellow color, 5-lobed, and 4 to 5 mm (0.2 in) in diameter. Fruit is green, ovoid, 13 to 18 mm (0.5 to 0.7 in) long, 4 to 6 mm (0.2 in) in diameter, 5-6-ribbed, minutely puberulent, and usually beaked.