Coprosma arborea is a species of tree found in New Zealand, traditionally known in Māori by the name mamangi. The flowers have insignificant petals and are wind pollinated, with long anthers and stigmas. The fruit is a non-poisonous juicy berry, containing two small seeds. A typical occurrence location of the species is in the Hamilton Ecological District in New Zealand's North Island.

Tree up to c. 10 m tall; trunk 2–4 dm diam.; branches rather close-set; branchlets slender, pubescent. Lvs on petioles winged in upper half, (8)–12–(20) mm long. Stipules short, triangular, connate near base, ciliolate, with prominent denticle. Lamina rather thin, glab., ovate to broad-elliptic to oblong, sts suborbicular; apex rounded or retuse, sts apiculate or mucronulate; cuneately or abruptly narrowed to petiole; margins thickened, indistinctly waved, often subcrenulate; ± 50—60 × 35–40 mm; lvs on young plants smaller, lamina ± 15–25 × 10–17 mm. Reticulations obscure above, us. distinct below. ♂ in dense glomerules, terminal on main and axillary branches; calyx-teeth linear, obtuse, ciliolate; corolla funnelform, lobes ovoid, acute, ± = tube. ♀ in clusters of 2–4; calyx-teeth obtuse, ciliolate; corolla-tube short, lobes long, acute. Drupe white, broad-oblong, c. 7 mm long.

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