An order of aquatic and semi-aquatic flowering plants that includes the family Alismaceae and related families.
From 'alisma' (water plantain) + '-ales' (scientific suffix for plant orders). This Linnaean classification groups entire families sharing evolutionary characteristics.
Alismales is a 'living fossil' order—these plants appeared 130 million years ago and barely changed, suggesting they already found the perfect blueprint for aquatic life early in flowering plant evolution.
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