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Howell's Yampah
Perideridia howellii
About Howell's Yampah (Perideridia howellii) 0 Nurseries Carry This Plant Perideridia howellii is a species of flowering plant in the carrot family known by the common name Howell's yampah. It is native to the mountains of Oregon and northern California, where it grows in moist soils, often near streams and rivers. It is a perennial herb which may exceed 1. 5 metres in maximum height, its slender, erect stem growing from a cluster of many narrow fibrous roots measuring up to 15 centimetres long. Leaves near the base of the plant have lance-shaped blades up to half a metre long which are divided into many leaflets made up of toothed, oval segments. Leaves higher on the plant are similar, but generally smaller. The inflorescence is a compound umbel of many spherical clusters of small white flowers. These yield ribbed, oblong-shaped fruits each about half a centimetre long.
Plant Description
Plant Type
Plant Type
Perennial herb

4.9 ft tall

Flower Color
Flower Color

Wildlife Supported

Butterflies & moths hosted ( 1 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Annual Precipitation: 21.1" - 156.0", Summer Precipitation: 0.52" - 5.90", Coldest Month: 31.3" - 48.0", Hottest Month: 55.7" - 71.5", Humidity: 0.92" - 21.91", Elevation: 1395" - 5868"

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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