One of the mysteries of the English language finally explained.
Any of various umbelliferous plants of damp or wet habitats, as (in early use) water parsnip (Sium latifolium) and wild celery (Apium graveolens), and (in later use) Oenanthe sarmentosa of western North America.
Mid 16th century; earliest use found in William Turner (d. 1568), naturalist and religious controversialist. From water + parsley.
water parsley/ˈwɔːtə ˌpɑːsli/
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