Page authors: Don Knoke, David Giblin
Oenanthe sarmentosa
oenanthe, Pacific water-dropwort, American water-parsley, Pacific water-parsley

Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.

Habitat: Low elevation wet areas, often in standing water.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles


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.
Publication: Prodr. [A. P. de Candolle] 4: 138. 1830.

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.

OregonFlora: Oenanthe sarmentosa information.

E-Flora BC: Oenanthe sarmentosa atlas page.

CalPhotos: Oenanthe sarmentosa photos.

USDA Plants: Oenanthe sarmentosa information.

35 photographs:
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