Metroxylon paulcoxii is a species of palm endemic to Samoa. It is reported there from the islands of 'Upolu and Savai'i. The species is named in honor of ethnobotanist Paul Alan Cox.McClatchey, Will. 1998. A new species of Metroxylon (Arecaceae) from Western Samoa. Novon 8:252-258.Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.
Metroxylon paulcoxii can attain a height of , with a non-branching trunk up to in diameter. Leaves are pinnately compound, with spines on the sheaths, petioles, and leaf margins. Leaflets can number as many as 150, each up to wide and long. Inflorescences have second-order branching, with as many as 450 flowers per branch. Flowers are wide, with staminate (male), pistillate (female), and hermaphroditic flowers frequently present on the same plant. Fruits are pear-shaped, fibrous and corky, up to long. Seeds are spherical, up to in diameter.McClatchey, W, HI Manner, CR Elevitch. April 2006, ver. 2.1. Species profiles for Pacific Island AgroforestryTropical Species Database
The species is similar to M. warburgii (also present in Samoa), but with shorter leaflets and with second-order branching in the inflorescence instead of third-order.
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