It inhabits montane mesic forests dominated by Acacia koa, Metrosideros polymorpha, and Dicranopteris linearis on Kauaʻi (Olokele Valley and Waimea Canyon) and East Maui (Auwahi).

Associated plants include Syzygium sandwicensis, Cheirodendron trigynum, Myrsine lessertiana, Ilex anomala, Alphitonia ponderosa, Zanthoxylum dipetalum, Kadua terminalis, Pleomele aurea, Bobea spp., Tetraplasandra waimeae, Xylosma hawaiensis, Eurya sandwicensis, Psychotria mariniana, Melicope anisata, Melicope barbigera, Planchonella sandwicensis, Dodonaea viscosa, and Dianella sandwicensis.

[4] This is a federally listed endangered species of the United States.

[5] This tree is very rare today, existing only on the islands of Kauai and Maui in small numbers.

A 1999 survey reported only a single wild individual remaining on Maui, and one cultivated tree in an arboretum.