Psychotria adamsonii is a species of plant in the family Rubiaceae. It is a shrub or tree endemic to the island of Ua Pou in the Marquesas Islands of French Polynesia. It is thought to be extinct.Psychotria adamsonii Fosberg. Plants of the World Online. Retrieved 27 May 2023.
The epithet adamsonii commemorates Alastair Martin Adamson of the Pacific Entomological Survey.F. R. Fosberg. Psychotria (Rubiaceae) in the Marquesas Islands. Notulae Systematicae (Paris). volume 8. pages 161-172.
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