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Otay Tarplant
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Deinandra conjugens
  

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About Otay Tarplant (Deinandra conjugens) Deinandra conjugens (syn. Hemizonia conjugens) is a rare species of flowering plant in the aster family known by the common names Otay tarplant and Otay tarweed. It is native to a small section of far northern Baja California in Mexico, its range extending north into San Diego County, California, in the United States. One isolated population has been reported from the hills east of Cayucos in San Luis Obispo County. Deinandra conjugens is threatened by habitat destruction and degradation. It was federally listed as a threatened species in 1998. Deinandra conjugens grows in clay soils in several types of habitat, including grassland and maritime and inland coastal sage scrub. It tolerates some disturbance in its habitat, and low levels of grazing and road maintenance activities such as mowing are probably beneficial. Most of the known occurrences of Deinandra conjugens are in San Diego County in the United States. Most of them are located in the southern part of the county in areas such as Otay Mesa and Proctor Valley. The city of San Diego has a conservation plan for this species and monitors it. There are about 34 to 37 occurrences remaining; some known occurrences are thought to have been extirpated since the plant was federally listed. The region in which the plant lives is heavily impacted by development and other processes and exists now in a fragmented state. 70% of the plant's habitat within its range has been destroyed. Much of the territory previously threatened by development has been conserved within a number of nature reserves. Many are protected under a San Diego county ordinance.
Plant Description
Plant Type
Annual herb

Native Status
Natural Setting
Elevation ?
68' - 571'

Annual Precip. ?
10.1" - 13.1"

Summer Precip. ?
0.22" - 0.33"

Coldest Month ?
52.5° F - 54.7° F

Hottest Month ?
71.8° F - 74.4° F

Humidity ?
1.64 vpd - 17.14 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available


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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