The Genus Concept in Practice: But for What Practice?

Problems with classifications that attempt to serve multiple purposes and which are formed by methodologies which conflict with evolutionary thought are discussed. Multiple- or general-purpose classifications are inherently unsuitable for dealing with particular problems since such classifications are optimal for no one problem and the goals of the user will conflict with the constraints of the classification. The value of having a classification that attempts to be congruent with our best estimate of phylogeny is stressed.