Through the efforts of Dr T. C. Whitmore and Mr G. F. C. Dennis large collections of trees from the Solomons have been accumulated in the past six years. Among them are some interesting collections of the genus Crossostylis, a truly oceanic-Pacific genus, ranging from the Tuamotos westwards as far as and including the Solomon Is. and New Caledonia. A map of its distribution has been given in ‘Pacific Plant Areas’ vol. I, map 23. Whitmore in his ‘Guide to the Forests of the British Solomon Islands’ 1966, p. 174, listed only C. cominsii Hemsl. from the Santa Cruz group. There appears, however, to be a second, undescribed species from the Solomons proper.