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Epilobium foliosum

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About Leafy Willowherb (Epilobium foliosum) Epilobium foliosum is a species of flowering plant in the evening primrose family known by the common names leafy willowherb and California willowherb. It is native to parts of western North America from British Columbia through California to Arizona, where it grows in many types of habitat, including disturbed areas. Epilobium foliosum is an annual herb producing a thin, spindly stem approaching 40 centimeters in height. The linear to lance-shaped leaves are up to 3 centimeters long, sometimes folded longitudinally and borne alternately or in clusters. The inflorescence is an open raceme of flowers, each with four small white petals which are notched at the tip, sometimes deeply. Each petal is only 2 or 3 millimeters long. The fruit is a slightly hairy capsule up to 2 centimeters in length.
Plant Description
Plant Type
Annual herb

Max. Height
1.3 ft (0.4 m)

Flower Color

Native Status

Natural Setting
Elevation ?
56' - 6339'

Annual Precip. ?
14.9" - 154.7"

Summer Precip. ?
0.36" - 5.95"

Coldest Month ?
37.7° F - 51.6° F

Hottest Month ?
57.4° F - 75.2° F

Humidity ?
0.23 vpd - 25.13 vpd

Landscaping Information
Common uses
Hummingbird Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
California Willowherb

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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