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Hoover's Eriastrum
Eriastrum hooveri
About Hoover's Eriastrum (Eriastrum hooveri) 0 Nurseries Carry This Plant Eriastrum hooveri is a rare species of flowering plant in the phlox family known by the common name Hoover's woollystar. It is endemic to the South Coast Ranges of California from San Benito to Los Angeles Counties, where it grows in grassy open habitat. It is an annual herb producing a wiry, usually woolly stem up to about 15 centimeters tall. The leaves are linear and threadlike, less than three centimeters long, and sometimes divided into two thready lobes. The inflorescence is a woolly cluster of narrow, leaflike bracts laced with webby fibers. The flowers are white and just a few millimeters in length. This plant was considered to be in serious jeopardy in the 1980s when many of its populations, most of which occurred on private and unprotected land, were in immediate danger of being destroyed by one or more threats, including conversion of the land for agricultural use, petroleum drilling, development for housing, grazing, agricultural pollution, invasive plants, flooding, and fire suppression. The plant was federally listed as a threatened species in 1990. After the listing, further studies revealed many more populations, including several in counties where it was not previously known. The species may have been sparse during the 1980s surveys due to drought conditions. The plant was also found to be more adaptable and resilient to destruction than previously thought. Several companies that own land where the plant occurs, such as that in the Lost Hills Oil Field, have put protection measures in place. Based on these events, which demonstrated the plant was not as threatened as was feared, it was delisted in 2003. It is still designated a sensitive species by the Bureau of Land Management.
Plant Description
Plant Type
Plant Type
Annual herb

1.2 - 5.9 in tall

Flower Color
Flower Color

Wildlife Supported

Butterflies & moths hosted ( 1 likely * ) SHOW ALL
Schinia aurantiaca Image
Schinia aurantiacaSchinia aurantiaca

Landscaping Information
Natural Setting
Annual Precipitation: 5.7" - 36.6", Summer Precipitation: 0.14" - 0.77", Coldest Month: 41.2" - 52.2", Hottest Month: 69.2" - 78.7", Humidity: 1.32" - 29.90", Elevation: 119" - 3232"

Alternative Names
Common Names: Hoover's Woollystar

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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