Pleurothyrium, a genus of Lauraceae mostly consisting of trees, ranges from Guatemala to Bolivia and possibly Southern Brazil. The genus is best represented in Peru, Ecuador, and Colombia and mostly occurs at low elevations. In this revision 39 species are included in Pleurothyrium, of which 19 are described as new. Taxonomic history, characters, and phylogenetic classification are discussed. Data on phenology, habitat preference, and altitudinal range are presented when available
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Henk van der Werff (1993) studied this question.