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Oenanthe sarmentosa
Also called Pacific Water Parsley, American Water Parsley, Pacific Water Dropwort, American Horsebane, Pacific Oenanthe, Water Parsley
Oenanthe sarmentosa is a species of flowering plant in the family Apiaceae known by the common name water parsley. It is native to western North America from Alaska to California, where it grows in wet areas, such as streambanks. It is sometimes aquatic, growing in the water. The plant has been used in cultivation in wetlands, and the recent discovery of several colonies growing by a stream in Illinois demonstrates its capacity to become a noxious weed if it is introduced elsewhere. This is a perennial herb growing to a maximum height near 1.5 meters. The leaves have blades up to 30 centimeters long borne on petioles up to 35 centimeters in length. The parsley-like leaf blade is divided into serrated, lobed leaflets. The inflorescence is a compound umbel of many flowers with bright white to red-tinged petals.
Fineleaf waterdropwort · Hemlock Water-dropwort · Tubular Water-dropwort · River Water-dropwort · Oenanthe globulosa · Java waterdropwort · Parsley water-dropwort · Corkyfruit waterdropwort · Narrow-leaved Water-dropwort · Waterdropwort
Text excerpted from the Wikipedia article Oenanthe sarmentosa by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
