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https://minnesotawildflowers.info/flower/water-celery
Oenanthe javanica (Water Celery): Minnesota Wildflowers
Photos and information about Minnesota flora - Water Celery: flattish clusters 1 to 2 inches across of 1/8-inch 5-petaled white flowers with 5 long stamens.
oenanthe javanicawater celeryminnesota wildflowers
https://practicalplants.org/wiki/vallisneria_americana/
Vallisneria americana (Water Celery) - Practical Plants
Vallisneria americana is a perennial member of the Vallisneria genus in the family Hydrocharitaceae.
vallisneria americanawater celerypracticalplants