Abstract
In the Kew herbarium, five similar specimens of Ischaemum from Christmas Island each carry a determinavit label signed by Stapf and bearing the name Ischaemum nativitatis Stapf. This name, however, was never formally published by Stapf. There is no date on the determinavit labels but they were presumably all affixed at the same time and since Ridley's two collections of 1904 are included they must have been put on after that date. Ridley in Journal of the Royal Asiatic Society, Straits Branch 45: 243 (1906) included in his list of plants for the island the name Ischaemumfoliosum Hack. var. leiophyllum Hack. Ridley gave a note on distribution and habitat, but no diagnosis or description was provided for this variety and although no specimens were cited I assume that Hackel's name applies to the two Ridley collections of Ischaemum to which Stapf affixed the determinavit labels bearing the name Ischaemum nativitatis. At the time of both Ridley's collections and Stapfs study only this one species of Ischaemum was known from Christmas Island.
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