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Hoover's Spurge
Euphorbia hooveri
About Hoover's Spurge (Euphorbia hooveri) 0 Nurseries Carry This Plant Euphorbia hooveri is a species of euphorb known by the common names Hoover's sandmat and Hoover's spurge. It is endemic to California, where it grows in the rare vernal pools of the Central Valley. Due to the elimination of most of its habitat, it became a federally listed threatened species in 1997. This is an annual herb forming flat mats of thin, hairless stems. The stems are ringed with pairs of tiny, minutely toothed round leaves, each gray-green leaf blade only a few millimeters wide. The inflorescence is a cyathium only two millimeters wide. The cyathium is made up of flat, white appendages surrounding a single minute female flower within a cluster of several male flowers. The female flower develops into a spherical fruit containing white seed. The seeds germinate once the pool evaporates with the arrival of summer.
Plant Description
Plant Type
Plant Type
Annual herb, Succulent

3.3 ft tall

Flower Color
Flower Color
White, Brown

Landscaping Information
Natural Setting
Annual Precipitation: 11.4" - 27.4", Summer Precipitation: 0.18" - 0.61", Coldest Month: 49.0" - 50.2", Hottest Month: 74.8" - 76.1", Humidity: 2.06" - 23.92", Elevation: 193" - 348"

Alternative Names
Common Names: Hoover's Sandmat

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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