During the preparation of the Vascular Flora of the Marquesas Islands three new species of Coprosma (Rubiaceae, tribe Anthospermeae) have come to light and are described herein: Coprosma fatuhivaensis W. L. Wagner & Lorence, Coprosma meyeri W. L. Wagner & Lorence, and Coprosma temetiuensis W. L. Wagner & Lorence. Descriptions, illustrations, conservation status, and specimen citations are provided. Amended descriptions of three previously described Marquesan Coprosma species are also provided as well as a key to the species, four of which fall into the Critically Endangered (CR) and two into the Endangered (EN) category. With the description of these the new species, Coprosma becomes the sixth largest lineage in the Marquesas Islands with six species after Psychotria (one lineage which has 9 spp.), Cyrtandra (8 spp.), Bidens (8 spp.), Melicope (7 spp.), and Ixora (7 spp.)
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