Page author: Don Knoke
Oenanthe sarmentosa
Pacific water-dropwort, American water-parsley
WTU specimens
Other herbaria

Distribution: West of the Cascades from British Columbia south to California.

Habitat: Low elevations; wet areas, often is standing water.

Flowers: June - August

Origin: Native

Conservation Status: Not of concern


Glabrous, weak, freely-branched perennial from fibrous roots, generally reclining and rooting at the nodes, the stem up to 1 m. long.


Leaves mostly bipinnate, the toothed to cleft leaflets 1.5-6 cm. long and 7-50 mm. wide, the primary lateral veins of the leaflets directed to the marginal teeth.


Inflorescence a compound umbel, the peduncles attached opposite the leaves; rays 10-20, 1.5-3 cm. long; involucre of a few narrow bracts or wanting; involucel of evident, narrow bractlets; calyx teeth evident, persistent; flowers white, the styles elongate.


Fruit glabrous, oblong, terete, truncate, 2.5-3.5 mm. long and 1.5-2 mm. wide, the conic stylopodium much smaller than the body of he fruit; the corky-thickened ribs much broader than the intervals.

Accepted Name:
Oenanthe sarmentosa C. Presl ex DC.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Oenanthe sarmentosa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Oenanthe sarmentosa checklist entry.

E-Flora BC: Oenanthe sarmentosa atlas page.

CalPhotos: Oenanthe sarmentosa photos.

USDA Plants: Oenanthe sarmentosa information.

31 photographs:
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