Kohlberg argued that though these six stages are artificial classifications of what is in reality much less discrete, they are the most logical.
2.
Naef s concern was with the discovery of natural, as opposed to artificial classification, a problem examined in detail by A . P . de Candolle.
3.
This contrasts with Linnaeus'artificial classification, which was designed for ease of use and focused on readily observed aspects of a plant, particularly the differences in the flowers.
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