The results reported form part of the series dealing with the timbers of the south-west Pacific area and cover 32 genera of the Myrtaceae. The timbers of this family are perhaps more important, from an economic standpoint, than those of any other in the area under consideration (with the possible exception of the Dipterocarpaceae). Based on the examination of all available species, the anatomical features of each genus have been summarized and the results set out in tabular form. From these a grouping of the genera of the family has been made, which reveals one or two inconsistencies with the botanical classification as proposed by Niedenzu. Particular mention has been made of the anatomical variation in Eugenia (sens, lat.). The affinities of the described genera with those of the New World, and the anatomical differences between the Myrtaceae and the closely alIied Lecythidaceae, are discussed. Anatomical features separating the Myrtaceae from four other families with some similar features have been pointed out.

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The results reported cover 12 genera of the family Apocynaceae and 12 genera of the Annonaceae. The anatomical features of these genera have been summarized for each family and the results compared with published information on the representatives of the families from other parts of the world. An artificial key has been developed for the separation of groups of genera in the Apocynaceae. This separation, however, does not conform with groupings based on botanical features. Possible affinities of this family have been discussed. In the Annonaceae separation of the genera on anatomical features has been found to be diffcult on account of the homogeneity in wood structure of the family as a whoIe.

No abstract