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Santa Susana Tarplant
Deinandra minthornii
About Santa Susana Tarplant (Deinandra minthornii) 1 Nurseries Carry This Plant Deinandra minthornii - (syn. Hemizonia minthornii) - is a rare California species of flowering plant in the aster family known by the common name Santa Susana tarplant, or Santa Susana tarweed. It is an endangered species, listed as a Threatened species by the California Department of Fish and Game, as Imperiled under the California Endangered Species Act-CESA, and on the California Native Plant Society Inventory of Rare and Endangered Plants of California. Deinandra minthornii (Hemizonia minthornii) is endemic from the Santa Susana Mountains, through the Simi Hills, to the Santa Monica Mountains of the southwestern Transverse Ranges, in Los Angeles and Ventura Counties, Southern California. This plant grows in the coastal sage scrub and chaparral habitats of the coastal sage and chaparral, and the chaparral habitat of the adjacent inland the montane chaparral and woodlands. It can be found on rocky outcroppings and in sandstone crevices, from 300-500 metres (980-1,640 ft) in elevation. There are about 20 occurrences of the plant, but several have not been observed recently. Deinandra minthornii is a shrub or subshrub growing 15 centimetres (5. 9 in) to 1 metre (3. 3 ft) in height. The stems are hairy, glandular, and leafy. The thick leaves are linear, smooth-edged or with a few teeth. They are glandular and hairy to bristly. The phyllaries lining the flower heads are coated in glands. The head contains four to eight yellow ray florets and several yellow disc florets.
Plant Description
Plant Type
Plant Type

0.49 - 3.3 ft tall

Flower Color
Flower Color

Landscaping Information
Full Sun


Common uses
Common uses
Bee Gardens

Natural Setting
Annual Precipitation: 17.2" - 21.8", Summer Precipitation: 0.19" - 0.29", Coldest Month: 51.0" - 54.2", Hottest Month: 74.4" - 78.3", Humidity: 3.01" - 23.98", Elevation: 923" - 2300"

Alternative Names
Botanical Names: Hemizonia minthornii
Common Names: Santa Susana Tarweed

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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