An archaeophyte is a plant species which is non-native to a geographical region, but which was an introduced species in "ancient" times, rather than being a modern introduction. Those arriving after are called neophytes. In Britain, archaeophytes are considered to be those species first introduced prior to 1492, when Christopher Columbus arrived in the New World and the Columbian Exchange began.
 See also
- Preston, Christopher D., David A. Pearman and Allan R. Hall (2004) Archaeophytes in Britain Botanical Journal of the Linnaean Society 145: 257-294
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