A botanical classification group of flowering plants that have simple or primitive flower structures, especially those with an undifferentiated perianth.
From Greek 'archi-' (primitive) and 'chlamys' (cloak or covering), referring to the outer flower parts. This is an older taxonomic term that classified plants based on their flower structure.
Plant scientists once used this classification to organize hundreds of species, but modern genetic testing has largely replaced it—it's a great reminder that science revises its categories as we learn more.
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