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Epilobium torreyi
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Torrey's Willowherb
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Epilobium torreyi

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About Torrey's Willowherb (Epilobium torreyi) Epilobium torreyi is a species of flowering plant in the evening primrose family known by the common names Torrey's willowherb and brook spike-primrose. It is native to western North America from British Columbia to California, where it grows in many types of habitat, often in moist areas. It is a hairy annual herb producing a narrow, upright stem often exceeding half a meter tall lined with narrow lance-shaped leaves. The hairy, glandular inflorescence bears tiny white or pink flowers. They are usually cleistogamous, remaining closed and self-pollinating. The fruit is a capsule up to about a centimeter long.
Plant Description
Plant Type
Annual herb

Max. Height
0.13 - 1.6 ft (0.04 - 0.49 m)

Flower Color
Pink, White

Native Status

Natural Setting
Elevation ?
-3' - 9233'

Annual Precip. ?
5.9" - 119.3"

Summer Precip. ?
0.20" - 4.10"

Coldest Month ?
28.2° F - 51.3° F

Hottest Month ?
48.7° F - 77.7° F

Humidity ?
0.70 vpd - 28.81 vpd

Landscaping Information
Common uses
Hummingbird Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Brook Spike-primrose

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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