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Why Plant Names Change
It may seem as if botanists take perverse pleasure in changing long-established names, but they are simply following the international rules that have been in force for nearly 100 years. There are many reasons why names change; the following are some of the major ones:
- Change in circumscription. If, after research on a particular group, it is determined that the group (typically genus or species) needs to be reclassified, it will often need a new name. For example, if a genus is split into several genera, only some of the species can retain the original genus name. Chrysanthemum is one genus that has been reclassified as several distinct genera. As a result, the botanical name of the ox-eye daisy changed from Chrysanthemum leucanthemum to Leucanthemum vulgare.
- The discovery of an earlier name. If an earlier name is found, it takes priority. An example of a plant whose botanical name changed several times as botanists discovered earlier epithets is wheat, Triticum aestivum. Recent changes in the rules make this type of change less likely in the future.
- Type. If, after examining the type, botanists determine that it belongs to a different species, its name must change. For an example, see the discussion of the small-headed aster of eastern North America.