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Oregon Yampah
Perideridia oregana
About Oregon Yampah (Perideridia oregana) 1 Nurseries Carry This Plant Perideridia oregana is a species of flowering plant in the carrot family known by the common name Oregon yampah. It is native to Oregon and California in the western United States, where it grows in woodland and other habitat. This plant is quite variable in appearance. In general, it is a perennial herb 10 to 90 centimeters tall, its green to waxy-grayish erect stem growing from a cluster of small tubers. Leaves near the base of the plant have blades 3 to 30 centimeters long divided into a variable number of leaflets, which may be subdivided into smaller segments. The flower cluster is a compound umbel of many spherical clusters of small white flowers. These yield ribbed, oblong-shaped fruits 3 to 6 millimeters long.
Plant Description
Plant Type
Plant Type
Perennial herb

0.33 - 3 ft tall

Flower Color
Flower Color

Wildlife Supported

Butterflies & moths hosted ( 2 likely * ) SHOW ALL
Epermenia cicutaella Image
Epermenia cicutaellaEpermenia cicutaella

Landscaping Information
Full Sun, Part Shade


Natural Setting
Site Type
Site Type
Open places

Annual Precipitation: 13.2" - 103.2", Summer Precipitation: 0.29" - 3.47", Coldest Month: 29.9" - 51.1", Hottest Month: 53.6" - 75.3", Humidity: 0.28" - 24.91", Elevation: 44" - 7478"

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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