Belonging to or characteristic of the Butomaceae family of aquatic flowering plants.
From Butomaceae (the plant family) plus the Latin suffix -ous (having the quality of). This adjectival form allows botanists to describe plants with these characteristics.
When botanists use -aceous adjectives, they're creating a shorthand that tells you exactly which family a plant belongs to—so 'butomaceous' is like a code that points directly to those sharp-leaved marsh flowers.
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