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Mount Diablo Jewelflower
Streptanthus hispidus
About Mount Diablo Jewelflower (Streptanthus hispidus) 0 Nurseries Carry This Plant Streptanthus hispidus, the Mt. Diablo jewelflower, is a rare species of flowering plant in the mustard family. It is endemic to Contra Costa County, California, where it is known from fewer than 15 occurrences on and around Mount Diablo. It grows in rocky outcrops in grassland and chaparral habitat. It is threatened by habitat degradation, such as trampling by hikers and destruction during maintenance activities. Streptanthus hispidus is a bristly annual herb growing up to 30 centimeters tall. Flowers occur in a raceme, the uppermost ones often sterile and different in form. The bristly bell-shaped calyx of sepals is greenish brown in the fertile flowers and purple in the sterile. Fertile flowers have four light purple petals up to a centimeter long. The fruit is a bristly silique up to 8 centimeters in length.
Plant Description
Plant Type
Plant Type
Annual herb

11.8 in tall

Flower Color
Flower Color
Purple, Brown

Wildlife Supported

Butterflies & moths hosted ( 4 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Annual Precipitation: 21.5" - 28.2", Summer Precipitation: 0.29" - 0.44", Coldest Month: 46.2" - 50.1", Hottest Month: 64.6" - 69.3", Humidity: 2.73" - 16.41", Elevation: 1335" - 3705"

Alternative Names
Common Names: Mt. Diablo Jewelflower

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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