This tree is single-sexed (dioecious), growing up to 30 m tall, with rough pale-brown bark. It is, or was formerly, one of the largest native Hawaiian trees.
The leaves are thin, dark green on top and pale green on the bottom (4-14 cm long, 2-9 cm wide). The small flowers are green with brown tips, on pedicels (stalks) 3-14 mm long, and the sepals are 1-2.5 mm long. The fruits are round and tiny, 3-6 mm in diameter, juicy, and reddish brown to black.
(Wagner, W. L., D. R. Herbst, and S. H. Sohmer. 1990. Manual of the flowering plants of Hawai'i, Bishop Museum Press, Honolulu, Hawai`i)