Belonging to or characteristic of the Apiaceae family of plants, which typically have small flowers arranged in umbrella-like clusters.
From the family name 'Apiaceae' with the '-ous' suffix meaning 'of or pertaining to.' It's the adjectival form used to describe plants that have the characteristics of parsley family members.
Apiaceous plants have a distinctive flower structure called an 'umbel' that looks like an upside-down umbrella, and it's so reliable as an identifier that you can often spot a member of this family just by its flowers.
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