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During the preparation of the Vascular Flora of the Marquesas Islands a new endemic species of Heliotropium L. (Boraginaceae) has come to light and is described herein: Heliotropium perlmanii Lorence & W. L. Wagner. It is known only from the island of Eiao and appears most closely related to H. marchionicum Decne., also endemic to the Marquesas and known from Nuku Hiva. An amended description of H. marchionicum and key to separate the Marquesan species are given and their differences discussed.