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Pacific Oenanthe
Oenanthe sarmentosa
About Pacific Oenanthe (Oenanthe sarmentosa) 4 Nurseries Carry This Plant Oenanthe sarmentosa is a species of flowering plant in the carrot family 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 flower cluster is a compound umbel of many flowers with bright white to red-tinged petals.
Plant Description
Plant Type
Plant Type
Perennial herb

5 ft tall

Flower Color
Flower Color
White, Red

Wildlife Supported

Butterflies & moths hosted ( 3 confirmed ) SHOW ALL
Agonopterix rosaciliella Image
Agonopterix rosaciliellaAgonopterix rosaciliella
Agonopterix oregonensis Image
Agonopterix oregonensisAgonopterix oregonensis

Landscaping Information
Full Sun


Soil Drainage
Soil Drainage

Common uses
Common uses
Bogs and Ponds

Sunset Zones
Sunset Zones?
4, 5, 6, 7, 14, 15*, 16*, 17, 22*, 23*, 24*

Natural Setting
Site Type
Site Type
Streams, marshes, ponds

Annual Precipitation: 5.6" - 88.1", Summer Precipitation: 0.18" - 2.95", Coldest Month: 33.7" - 56.8", Hottest Month: 57.5" - 79.3", Humidity: 0.02" - 29.40", Elevation: -1" - 6211"

Alternative Names
Common Names: Water Parsely, Water Parsley

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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