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Cladistics a guide to biological classification David M. Williams, Natural History Museum, London, Malte C. Ebach, University of New South Wales

Introduction: Carving nature at its joints, or Why birds are not dinosaurs and men are not apes -- Part I. The Interrelationships of Organisms: 1. What this book is about -- 2. Classification -- Part ...
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Classification, evolution, and phylogeny of the families of Monocotyledons / Aaron Goldberg

To some extent classification is subjective. Taxonomists differ in the relative importance they ascribe to particular characters and in the degree of difference between related taxa they deem ...