A new dioecious species, Trimenia nukuhivensis W.L. Wagner & Lorence, is described and illustrated. It is restricted to upper montane wet forest on the island of Nuku Hiva (Marquesas Islands in French Polynesia). Trimenia nukuhivensis differs from T. marquesensis, the only other species of this genus in the Marquesas Islands, by its glabrescent habit, larger lanceolate-elliptic leaf blades with widely spaced marginal serrations, longer petioles, fewer stamens in the staminate flowers, and darker purple fruit. The Marquesan species are most closely related to T. weinmanniifolia from Fiji and Samoa.
Trimenia, basal Angiosperm, Nuku Hiva, Marquesas Islands, French Polynesia, dioecious