From the Liberian rain forest 75 important tree species were systematically described. In the introduction reasons for choice of species and nomenclature were set out. History and literature of the botanical exploration of Liberia were surveyed. Physiography, geology, soils and climate of lowland rain forest were discussed.The evolution and situation of the vegetation cover, especially of forest, in Liberia were sketched. The primeval rain forest hardly existed any longer; most of the forest area seemed to be secondary. Two vegetational zones were distinguished, the evergreen forest and the humid semi-deciduous forest. In the first zone in the high forest, species were mainly of the sub-family Caesalpinioideae. In the fourth chapter determinative keys for leaf and field characteristics were established, for trees with a chest-height diameter of (as a rule) more than 40 cm.Finally the 75 species were described, arranged in 23 alphabetical families, within which species were also arranged alphabetically. Voorhoeve included field notes and, for the most important commercial wood species, forestry data in the descriptions.
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